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‌TRANSMISSION‌

Automatic Transmission - 5ET50 (MKV) - Volt

SPECIFICATIONS

TEMPERATURE VERSUS RESISTANCE (TRANSMISSION FLUID TEMPERATURE SENSOR)

FASTENER SPECIFICATIONS (OFF-VEHICLE)

Single Use Non-Threaded Fasteners/Components

Single Use Threaded Fastener/Component Tightening Specifications

Reusable Threaded Fastener Tightening Specifications

FASTENER SPECIFICATIONS (ON-VEHICLE)

Single Use Non-Threaded Fasteners/Components

Single Use Threaded Fastener/Component Tightening Specifications

Reusable Threaded Fastener Tightening Specifications

APPROXIMATE FLUID CAPACITIES

TRANSMISSION GENERAL SPECIFICATIONS

ADHESIVES, FLUIDS, LUBRICANTS, AND SEALERS

CLUTCH BACKING PLATE RETAINING RING SPECIFICATIONS

Variable High Clutch Backing Plate Retaining Ring

Variable Low Clutch Backing Plate Retaining Ring

AUTOMATIC TRANSMISSION TORQUE DAMPENER THRUST WASHER SPECIFICATIONS

RANGE REFERENCE

TRANSMISSION INTERNAL MODE SWITCH LOGIC

Internal Mode Switch

Internal Mode Switch

Internal Mode Switch

Selector Position

Selector Position

Selector Position

Internal Mode Switch

SCHEMATIC WIRING DIAGRAMS

AUTOMATIC TRANSMISSION CONTROLS WIRING SCHEMATICS

Drive Mode Select Function

Fig. 1: Drive Mode Select Function

Courtesy of GENERAL MOTORS COMPANY

Pressure Controls, Shift Controls and Speed Sensor

Fig. 2: Pressure Controls, Shift Controls and Speed Sensor Courtesy of GENERAL MOTORS COMPANY

Shift Lever Position Indicator

Fig. 3: Shift Lever Position Indicator

Courtesy of GENERAL MOTORS COMPANY

COMPONENT LOCATOR

DISASSEMBLED VIEWS

Case and Associated Parts (1 of 2)

Fig. 4: Case and Associated Parts (1 of 2) Courtesy of GENERAL MOTORS COMPANY

Case and Associated Parts (2 of 2)

Fig. 5: Case and Associated Parts (2 of 2) Courtesy of GENERAL MOTORS COMPANY

Transmission Case Assembly (1 of 2)

Fig. 6: Transmission Case Assembly (1 of 2) Courtesy of GENERAL MOTORS COMPANY

Transmission Case Assembly (2 of 2)

Fig. 7: Transmission Case Assembly (2 of 2) Courtesy of GENERAL MOTORS COMPANY

Torque Dampener and Differential Housing Assembly

Fig. 8: Torque Dampener and Differential Housing Assembly Courtesy of GENERAL MOTORS COMPANY

Control Valve Body Assembly

Fig. 9: Control Valve Body Assembly

Courtesy of GENERAL MOTORS COMPANY

Drive Motor Assembly (1st Position)

Fig. 10: Drive Motor Assembly (1st Position) Courtesy of GENERAL MOTORS COMPANY

Drive Motor Assembly (2nd Position)

Fig. 11: Drive Motor Assembly (2nd Position) Courtesy of GENERAL MOTORS COMPANY

Output Carrier Internal Gear Assembly

Fig. 12: Output Carrier Internal Gear Assembly Courtesy of GENERAL MOTORS COMPANY

Variable Low Clutch Assembly

Fig. 13: Variable Low Clutch Assembly Courtesy of GENERAL MOTORS COMPANY

Variable High Clutch Assembly

Fig. 14: Variable High Clutch Assembly Courtesy of GENERAL MOTORS COMPANY

Torque Limiting Clutch Assembly

Fig. 15: Torque Limiting Clutch Assembly Courtesy of GENERAL MOTORS COMPANY

Park System Components

Fig. 16: Park System Components

Courtesy of GENERAL MOTORS COMPANY

COMPONENT LOCATION

Component Locations

Fig. 17: Transaxle Internal Component Locations Courtesy of GENERAL MOTORS COMPANY

BUSHING, BEARING, AND WASHER LOCATIONS

Location Of The Bushings, Bearings, and Washers

Fig. 18: Bushings, Bearings, And Washer Locations Courtesy of GENERAL MOTORS COMPANY

SEAL LOCATIONS

Seal Locations #1

Fig. 19: Seal Locations #1

Courtesy of GENERAL MOTORS COMPANY

Seal Locations #2

Fig. 20: Seal Locations #2

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC P0658 OR P0659: ACTUATOR HIGH CONTROL CIRCUIT GROUP 1 VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC P0658

Actuator High Control Circuit Group 1 Low Voltage

DTC P0659

Actuator High Control Circuit Group 1 High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

High Side Drive 1

Circuit/System Description

The high side driver 1 is internal to the Hybrid/EV powertrain Control Module 1. With the ignition On, the high side driver 1 provides 12 V to the transmission control solenoid valve and line pressure control solenoid. If excessive current flow is detected in high side driver 1 circuit, the high side driver 1 will turn Off. When the circuit fault is corrected, the high side driver 1 will reset. The hybrid/EV powertrain control module 1 and both drive motor control modules are internal to the power inverter module, often referred to as the drive motor generator power inverter

module, and not serviced separately. Conditions for Running the DTC High side driver 1 is On.

Conditions for Setting the DTC

P0658

Hybrid/EV powertrain Control Module 1 has detected a short to ground on the high side driver 1 circuit during Hybrid/EV powertrain Control Module 1 initialization.

P0659

Hybrid/EV powertrain Control Module 1 has detected a short to voltage on the high side driver 1 circuit during Hybrid/EV powertrain Control Module 1 initialization.

Actions Taken When the DTC Sets

DTCs P0658, and P0659 are Type A DTCs.

P0658

The Hybrid/EV powertrain control module commands maximum line pressure.

The Hybrid/EV powertrain control module inhibits clutch 1, also call the variable low clutch.

Conditions for Clearing the DTC

DTCs P0658, and P0659 are Type A DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

INLINE HARNESS CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Component Description

Transmission Component and System Description Transmission General Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool High Side Driver 1 Command parameter displays On.

If On is not displayed

Refer to Circuit/System Testing.

If On is displayed

3. Verify the parameters listed below do not display Malfunction when commanding the high side driver 1, On and Off with a scan tool.

High Side Driver 1 Circuit Low Voltage Test Status High Side Driver 1 Circuit Open Test Status

High Side Driver 1 Circuit High Voltage Test Status

If Multifunction is displayed

Refer to Circuit/System Testing.

If Multifunction is not displayed

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal

protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Remove the Control Valve Body Cover. Refer to Control Valve Body Cover Replacement.

3. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve.

4. Connect the 12 V battery.

5. Ignition ON, connect a test lamp between the high side driver circuit X1 terminal 1 and the ground.

6. Verify the test lamp turns ON.

If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve.

If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve. If less than 2 Ω, replace the T6 Power Inverter Module.

If the test lamp is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the T6 Power Inverter Module.

If the test lamp turns ON and OFF

7. Test or replace the Q8 Control Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for T6 Power Inverter Module replacement, often referred to as the

Drive Motor Generator Power Inverter Module, replacement, programming, and setup.

Refer to Control Solenoid Valve Replacement for Q8 Control Solenoid Valve replacement.

Refer to Control Valve Assembly and Transmission Wiring Harness Removal for Automatic Transmission Wiring Harness - Control Solenoid Valve replacement.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module is replaced. Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P0711-P0713: TRANSMISSION FLUID TEMPERATURE SENSOR

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC P0711

Transmission Fluid Temperature Sensor Performance

DTC P0712

Transmission Fluid Temperature Sensor Circuit Low Voltage

DTC P0713

Transmission Fluid Temperature Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Transmission Fluid Temperature

Circuit/System Description

The primary source of heat in the transmission is the drive motor generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generators and flows to the transmission cooler supply line. The supply line connects to the transmission cooler, which is internal to the radiator. The transmission fluid cooler pipe assembly is equipped with an internal thermostat that opens at 80°C (176°F) for optimum transmission operation and fuel economy. The transmission cooler pipe thermostat is part of the transmission fluid cooler pipe assembly, located near the transmission and is not serviced separately. From the cooler, the fluid returns through the transmission fluid cooler pipe assembly and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. The transmission fluid temperature sensor is part of the control solenoid valve assembly and is not serviced separately.

Conditions for Running the DTC

The ignition On is greater than 3 s.

The system voltage is greater than 9 V.

P0711

DTCs P0712, P0713, U179A, or U0293 are not active. Vehicle speed is detected for 5 s.

Cold soak average and vehicle running transmission fluid temperature is between -40°C (-40°F) and 130°C (266°F).

The difference between the transmission fluid temperature sensor and the cold soak average temperature is less than 15°C (27°F) at -40°C to -20°C (-40°F to -4°F) or less than 10°C (18°F) greater than

-20°C (-40°F) ambient temperature.

Conditions for Setting the DTC

P0711

The difference between the transmission fluid temperature sensor and the cold soak average temperature is greater than 15°C (27°F) at -40°C to -20°C (-40°F to -4°F) or greater than 10°C (18°F) greater than -20°C (-40°F) ambient temperature for greater than or equal to 300 s.

OR

The transmission fluid temperature is stuck for greater than or equal to 300 s.

P0712

The Hybrid/EV Powertrain Control Module 1 detects a transmission fluid temperature sensor resistance of less than or equal to 68.6 Ω which corresponds to 149°C (300°F) for 2 s out of a 3 s window.

P0713

The Hybrid/EV Powertrain Control Module 1 detects a transmission fluid temperature sensor resistance of greater than or equal to 83,641 Ω which corresponds to -50°C (-58°F) for 2 s out of a 3 s window.

Actions Taken When the DTC Sets

DTCs P0711, P0712 and P0713 are Type A DTCs.

The Hybrid/EV powertrain control module switches to a calculated transmission fluid temperature.

Conditions for Clearing the DTC

DTCs P0711, P0712 and P0713 are Type A DTCs.

Diagnostic Aids

The Transmission Fluid Temperature parameter on the scan tool should rise steadily to a normal operating temperature, and then stabilize. Ask about the customer's driving habits, overloading, etc. Ensure the engine and transmission cooling system is functioning normally.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Special Tools

GE-24731 Tempil Stick

For equivalent regional tools, refer to Special Tools.

Circuit/System Verification

1. Vehicle ON, observe the scan tool Transmission Fluid Temperature and the ECT temperature parameter after a 9 hour cold soak. The readings should be between -50 to 149°C (-58°F to 300°F) and vary less than 15°C (27°F) at -40°C to -20°C (-40°F to -4°F) or less than 10°C (18°F) greater than -20°C

(-40°F) from ambient temperature after an 9.5 hour cold soak. The transmission fluid temperature parameter should rise steadily then stabilize when the vehicle is driven for greater than 300 s.

If greater than the specified range, or stuck at a fixed temperature

Refer to Circuit/System Testing.

If within the specified range

Test for a transmission overheat condition. Refer to Transmission Overheats .

If no automatic transmission overheating condition exists

2. Refer to Circuit System Testing.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Remove the Control Valve Body Cover. Refer to Control Valve Body Cover Removal.

3. Vehicle Off and all vehicle systems Off. Disconnect the X1 harness connector at the Q8 Control Solenoid Valve. It may take up to 2 min. for all vehicle systems to power down.

4. Test for less than 10 Ω between the low reference circuit terminal 4 on the X1 harness connector and ground.

If 10 Ω or greater

1. Vehicle Off, disconnect the Automatic Transmission Wiring Harness (Control Solenoid Valve) harness connector at the T6 Power Inverter Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, replace the Automatic Transmission Wiring Harness (Control Solenoid Valve). If less than 2 Ω, replace the T6 Power Inverter Module.

If less than 10 Ω

5. Vehicle in Service Mode.

6. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.

If not between 4.8 - 5.2 V

1. Ignition Off, disconnect the Automatic Transmission Wiring Harness (Control Solenoid Valve) harness connector at the T6 Power Inverter Module.

2. Test for infinite resistance between the signal circuit terminal 3 and ground.

If less than infinite resistance, replace the Automatic Transmission Wiring Harness (Control Solenoid Valve).

If infinite resistance

3. Test for less than 1 Ω in the signal circuit end to end.

If 1 Ω or greater, replace the Automatic Transmission Wiring Harness (Control Solenoid Valve). If less than 1 Ω, replace the T6 Power Inverter Module.

If between 4.8 - 5.2 V

7. Replace the Q8 Control Solenoid Valve.

Component Testing

1. Perform each step listed below:

Perform the Fluid Leak Diagnosis .

Perform the Transmission Fluid Level and Condition Check procedure. Perform the Line Pressure Check procedure.

Perform the Automatic Transmission Fluid Pump Pressure High or Low procedure.

With a hand held infra-red thermometer, or GE-24731 tempil stick test for the transmission cooler supply line thermostat for opening at 80°C (176°F). The transmission cooler supply line temperature should be higher on the transmission side of the thermostat than the cooler side until 80°C (176°F) is reached.

If the thermostat tests stuck open or closed

Replace the transmission cooler supply pipe assembly.

If thermostat tests OK

2. Perform the Control Solenoid Valve Performance Test. If a concern is found

Replace the Q8 Control Solenoid Valve.

If a concern is not found

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Transmission Fluid Cooler Thermal Bypass Valve Replacement

Refer to Control Module References for T6 Power Inverter Module, often referred to as the Drive Motor Generator Power Inverter Module, replacement, programming and setup.

Refer to Control Solenoid Valve Replacement for Q8 Control Solenoid Valve replacement. Refer to Automatic Transmission Wiring Harness Replacement

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P0721: OUTPUT SPEED SENSOR PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P0721

Output Speed Sensor Performance

Diagnostic Fault Information

Typical Scan Tool Data

Output Shaft Direction

Circuit/System Description

The A/Trans Output Speed Sensor Assembly has 2 internal hall-effect type sensors, and is capable of sensing both speed and direction. The output speed sensor is internal to the transmission and mounts to the A/Trans case assembly and is connected to the hybrid/EV powertrain control module 1 through the transmission internal harness. The A/Trans Output Speed Sensor Assembly faces the park gear machined teeth surface. The sensor receives 5 V on the OSS supply voltage circuit from the hybrid/EV powertrain control module 1. As the output shaft rotates, the sensor produces a signal frequency based on the machined surface of the output shaft. The two sensor elements in the output speed sensor assembly are spaced approximately 1/2 a tooth apart.

When the vehicle is moving in a forward direction, sensor A detects a particular tooth before sensor B. When the vehicle is moving in a reverse direction, sensor B detects a particular tooth before sensor A.

The electronics in the sensor combine the two signals and send a signal with a different pulse width. This signal is interpreted by the hybrid/EV powertrain control module 1 for speed and direction and is transmitted through the serial data circuits to the engine control module (ECM) The ECM, hybrid/EV powertrain control module 1, compare the output speed sensor signal with the antilock brake system (ABS) wheel speed sensor signal. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced

separately.

Conditions for Running the DTC

The vehicle is ON.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 1 detects an invalid Automatic Transmission Output Shaft Speed Sensor direction for 2.5 s within a 3 s window.

Action Taken When the DTC Sets

The hybrid/EV powertrain control module 1 calculates vehicle speed based on the drive motor 2 speed.

Conditions for Clearing the DTC DTC P0721 is a Type A DTC. Reference Information Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information. Special Tools

EL 38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools.

Circuit/System Verification

1. Operate the vehicle at 16 - 32 km/h (10 - 20 mph), observe the scan tool Transmission OSS parameter. The reading should be greater than 150 RPM and not drop out.

2. Observe the scan tool OSS Supply Voltage parameter. The reading should display OK.

Circuit/System Testing

1. Vehicle ON.

2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

3. Verify DTC P7021 is not set.

If DTC is set

Perform the Output Shaft Speed Input Test.

If the DTC is not set

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P077B-P077D: OUTPUT SPEED SENSOR CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P077B

Output Speed Sensor Circuit Direction Incorrect

DTC P077C

Output Speed Sensor Circuit Low Voltage

DTC P077D

Output Speed Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Output Shaft Direction

Circuit/System Description

The transmission output shaft speed sensor has 2 internal hall-effect type sensors, and is capable of sensing both speed and direction. The transmission output shaft speed sensor mounts to the A/Trans case assembly and is connected to the hybrid/EV powertrain control module 1 assembly through a wire harness and connector. The sensor faces the drive sprocket machined teeth surface. The sensor receives 5 V on the OSS supply voltage circuit from the hybrid/EV powertrain control module 1. As the drive sprocket rotates, the sensor produces a signal frequency based on the machined surface of the drive sprocket.

The two sensor elements in the transmission output shaft speed sensor are spaced approximately 1/2 a tooth apart.

When the vehicle is moving in a forward direction, sensor A detects a particular tooth before sensor B. When the vehicle is moving in a reverse direction, sensor B detects a particular tooth before sensor A.

The electronics in the sensor combine the two signals and send a signal with a different pulse width. This signal is interpreted by the hybrid/EV powertrain control module 1 for speed and direction and is transmitted through the GMLAN circuits to the ECM. The ECM and hybrid/EV powertrain control module 1, compare the OSS signal with hybrid motor speed/direction and the ABS wheel speed sensor signal.

Conditions for Running the DTC

P077B

DTC P0721, P077C, P077D, or P215C is not set.

The drive motor estimated output speed is greater than 50 RPM.

P077C

DTC P077D is not set.

System voltage is at least 9 V and no more than 32 V.

P077D

DTC P077B is not set.

System voltage is at least 9 V and no more than 32 V.

Conditions for Setting the DTC

P077B

The hybrid/EV powertrain control module 1 detects an incorrect OSS direction.

P077C

The hybrid/EV powertrain control module 1 detects the output speed sensor signal voltage is less than 0.36 V for

0.25 s.

P077D

The hybrid/EV powertrain control module 1 detects the output speed sensor signal voltage is greater than 4.25 V for

0.25 s.

Action Taken When the DTC Sets

The hybrid/EV powertrain control module 1 uses drive motor 2 speed to calculate vehicle speed.

Conditions for Clearing the DTC

P077B, P077C, and P077D are Type A DTCs.

Diagnostic Aids

Inspect the output speed sensor, harness, connector and control solenoid valve assembly pins for metallic debris and output shaft machined face for damage or misalignment. Proper torque of the output speed sensor mounting bolt is critical to proper output speed sensor operation. Use a terminal test kit for any test that requires probing the control solenoid valve assembly harness connector or a component harness connector.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Component Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information. Special Tools

EL 38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools.

Circuit/System Verification

1. Verify that DTC P0721, P0970, P0971, P0973, P2720, P2721, P2729, or P2730 are not set.

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Operate the vehicle at 16 - 32 km/h (10 - 20 mph) while observing the Transmission Data OSS Direction parameter on the scan tool. The OSS Direction parameter should match vehicle direction.

If the OSS parameter corresponds with the vehicle direction and the DTC is set, replace the T6 power inverter module.

Circuit/System Testing

1. Vehicle ON.

2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

3. Verify DTC P077B, P077C, or P077D is not set.

If DTC is set

Perform the Output Shaft Speed Input Test.

If the DTC is not set

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Drive Motor Generator Power Inverter Module, also called the T6 power inverter module replacement, programming, and setup

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P079A: TRANSMISSION CLUTCH 1 SLIP DETECTED

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P079A

Transmission Clutch 1 Slip Detected

Typical Scan Tool Data

Variable Low Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module 1 monitors the Clutch 1 Slip Speed for each Hybrid Transmission Mode Commanded state. The hybrid/EV powertrain control module 1 monitors clutch slip when the variable low clutch is applied. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Clutch 1 is applied.

No P1B0D, P1B0E, P1E4A or P1E4B DTCs.

The commanded line pressure is at least 190 kPa (28 psi) for 1 s.

The variable low clutch torque estimated is greater than 74 N.m (55 lb ft) for 1 s. Wheel slip speed is 0.

Shutdown is not commanded.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 1 detects clutch 1 slip speed greater than 190 RPM for 1 s, 3 times within the same key cycle.

Clutch 1 energy is greater than 8 joules 3 times within the same key cycle, the fault will set instantly.

Action Taken When the DTC Sets

P079A is a Type A DTC.

The hybrid/EV powertrain control module 1 commands the internal combustion engine On. The hybrid/EV powertrain control module 1 inhibits mode 1 and gear 1.

Conditions for Clearing the DTC P079A is a Type A DTC. Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Component Description

Transmission Component and System Description Transmission General Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Vehicle ON.

2. Verify that DTC P0721, P077B-P077D or P215C is not set.

If the DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If the DTC is not set

3. Verify correct fluid level and condition by performing the Transmission Fluid Level and Condition Check.

4. Verify correct oil pressure by performing the Line Pressure Check.

5. Operate the vehicle within the Conditions for Running the DTC. The Clutch 1 Slip Speed parameter reading should be less than 190 RPM when the Clutch 1 Status parameter reading is Applied.

If clutch slip speed is greater than 190 RPM

Refer to Component Testing.

If clutch slip speed is less than 190 RPM

6. All OK.

Component Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling

2. Verify control solenoid valve assembly condition by performing the Control Solenoid Valve Inspection.

3. Verify control solenoid valve assembly function by performing the Control Solenoid Valve Performance Test.

If a concern is found

Replace the Q8 Control Solenoid Valve.

If no concern is found

4. Inspect the a/trans fluid level control valve for stuck closed or damaged condition.

If you found a concern with the a/trans fluid level control valve

Replace the a/trans fluid level control valve.

If no concern is found

5. Inspect the valve body components and hydraulic circuits listed below for a leak or a stuck valve. Refer to

Control Valve Body Diagnostic Inspection:

Control valve body spacer (w/gasket) plate assembly

Variable low clutch valve and variable low clutch accumulator.

If you found a concern in the valve body

Repair or replace the valve or valve body.

If no concern is found

6. Inspect the variable low clutch assembly snap ring, piston, clutch discs, and housing for a slipping or damaged condition.

If you found a variable low clutch assembly concern

Repair or replace the variable low clutch assembly as necessary.

If no concern is found

7. Replace the T6 Power Inverter Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Valve Body Replacement for control valve body replacement.

Refer to Control Solenoid Valve Replacement for Q8 Control Solenoid Valve replacement.

Refer to Variable Low Clutch Plate Removal, and Variable Low Clutch Plate Installation for variable low clutch replacement.

Refer to Control Module References for T6 Power Inverter Module, often referred to as the Drive Motor Generator Power Inverter Module replacement, programming, and setup.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P079B: TRANSMISSION CLUTCH 2 SLIP DETECTED

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P079B

Transmission Clutch 2 Slip Detected

Typical Scan Tool Data

Variable High Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module 1 monitors Clutch 2 Slip Speed for each Hybrid Transmission Mode Commanded state. The hybrid/EV powertrain control module 1 monitors clutch slip when the variable high clutch is commanded ON. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Clutch 2 is applied.

No P1B0D, P1B0E, P1E4A or P1E4B DTCs.

The commanded line pressure is at least 190 kPa (28 psi) for 1 s.

The variable high clutch torque estimated is greater than 15 N.m (11 lb ft) for 1 s. Wheel slip speed is 0.

Shutdown is not commanded.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 1 detects clutch 2 slip speed greater than 100 RPM for 2.5 s within a 3 s window, 3 times within the same key cycle.

Clutch 1 energy is greater than 5.8 joules 3 times within the same key cycle, the fault will set instantly.

Action Taken When the DTC Sets

DTC P079B is a Type A DTC.

The hybrid/EV powertrain control module 1 inhibits mode 2 and gear 1.

Conditions for Clearing the DTC P079B is a Type A DTC. Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Component Description

Transmission Component and System Description Transmission General Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON.

2. Verify that DTC P0721, P077B-P077D or P215C is not set.

If the DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If the DTC is not set

3. Verify correct fluid level and condition by performing the Transmission Fluid Level and Condition Check.

4. Verify correct oil pressure by performing the Line Pressure Check.

5. Operate the vehicle within the Conditions for Running the DTC. The Clutch 2 Slip Speed parameter reading should be less than 100 RPM when the Clutch 2 Status parameter reading is Applied.

If clutch slip speed is greater than 100 RPM

Refer to Component Testing.

If clutch slip speed is less than 100 RPM

6. All OK.

Component Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following

Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Verify control solenoid valve assembly condition by performing the Control Solenoid Valve Inspection.

3. Verify control solenoid valve assembly function by performing the Control Solenoid Valve Performance Test.

If a concern is found

Replace the Q8 Control Solenoid Valve.

If no concern is found

4. Inspect the a/trans fluid level control valve is for a stuck, closed or damaged condition.

If you found a concern with the a/trans fluid level control valve

Replace the a/trans fluid level control valve.

If no concern is found

5. Inspect the variable high clutch valve is not sticking or damaged. Refer to Control Valve Body Diagnostic Inspection.

If you found a concern with the variable high clutch valve

Repair or replace the valve body.

If no concern is found

6. Verify the variable high clutch assembly piston, snap ring, and clutch discs are not in a damaged condition.

If you found a variable high clutch concern

Repair or replace the variable high clutch as necessary.

If no concern is found

7. Replace the T6 Power Inverter Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Valve Body Replacement for control valve body replacement

Refer to Control Solenoid Valve Replacement for Q8 Control Solenoid Valve replacement.

Refer to Variable High Clutch Removal, and Variable High Clutch Installation for variable high clutch replacement.

Refer to Control Valve Body Diagnostic Inspection

Refer to Transmission Replacement for Transmission removal.

Refer to Control Module References for T6 Power Inverter Module, often referred to as the Drive Motor Generator Power Inverter Module replacement, programming, and setup.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P079C: TRANSMISSION CLUTCH 3 SLIP DETECTED

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P079C

Transmission Clutch 3 Slip Detected

Typical Scan Tool Data

Input Brake Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module 1 monitors the Clutch Slip 3 Speed for each Hybrid Transmission Mode Commanded state. Clutch 3 in the vehicle software is tied to the input brake clutch in the transmission. This is a one way mechanical clutch. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Line pressure command is greater than 190 kPa (27.6 psi) for 1 s. No P1B0D, P1B0E, P1E4A, or P1E4B motor speed DTCs are set. Clutch 3 command is Locked.

Wheel slip speed is 0.

Shutdown is not commanded.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 1 detects the clutch 3 Slip Speed is greater than 100 RPM for 1 s.

Action Taken When the DTC Sets

P079C is a Type A DTC.

The hybrid/EV powertrain control module 1 commands the internal combustion engine On.

Conditions for Clearing the DTC P079C is a Type A DTC. Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Component Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and

personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Inspect the flexplate for a broken condition.

3. Inspect the input brake clutch for a broken condition.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Transmission Replacement for Transmission removal Refer to Automatic Transmission Flex Plate Removal

Refer to Automatic Transmission Torque Dampener and Differential Housing Disassemble for Input Brake Clutch removal procedure

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P07A3: TRANSMISSION CLUTCH 1 STUCK ON

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P07A3

Transmission Clutch 1 Stuck On

Typical Scan Tool Data

Variable Low Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module 1 monitors the variable low clutch slip speed for each Hybrid/EV Transmission Mode Command state. Low clutch slip speed when the clutch is commanded Off indicates a stuck or welded clutch condition. If the hybrid/EV powertrain control module 1 detects a stuck clutch condition, the hybrid/EV powertrain control module 1 will cycle the clutch 3 times within 30 seconds. The customer may feel 3 bumps before the DTC sets. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Variable low clutch (Clutch 1) is commanded OFF.

No P179A, P1B0D, P1B0E, P1E4A, or P1E4B motor speed DTCs are set. Shutdown is not commanded.

Conditions for Setting the DTC

Clutch slip is less than 30 RPM 3 times within 1 s when clutch slip is expected.

Action Taken When the DTC Sets

P07A3 is a Type A DTC.

The hybrid/EV powertrain control module 1 commands clutch 1 and clutch 2 Off.

Conditions for Clearing the DTC P07A3 is a Type A DTC. Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any transmission output speed sensor DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Verify that P0721, P077B-P077D or P215C is not set.

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Perform the Transmission Fluid Level and Condition Check to verify correct fluid level and condition. If the transmission fluid is low or discolored, refer to Transmission Fluid Drain and Fill.

3. Operate the vehicle within the Conditions for Running the DTC while monitoring the Clutch 1 Slip Speed parameter. The Clutch 1 Slip Speed parameter should display greater than 30 RPM when the Clutch 1 Status parameter displays Released.

If the DTC P07A3 resets, go to Component Testing.

Component Testing

1. Verify correct oil pressure by performing the Line Pressure Check.

2. Perform the Control Solenoid Valve Performance Test.

If a concern is found, replace the Q8 control solenoid valve.

3. Inspect the valve body assembly for sticking or damaged valves. Refer Control Valve Body Diagnostic Inspection.

If you found a stuck or damaged valve, repair or replace the valve or valve body.

4. Inspect the variable low clutch for a stuck On or damaged condition.

If you found a variable low clutch concern, repair or replace the variable low clutch assembly as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Variable Low Clutch Plate Removal, and Variable Low Clutch Plate Installation for variable clutch repair or replacement.

Refer to Control Valve Assembly and Transmission Wiring Harness Removal for Q8 control solenoid valve or control valve body replacement.

Refer to Transmission Replacement for transmission removal.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P07A5: TRANSMISSION CLUTCH 2 STUCK ON

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P07A5

Transmission Clutch 2 Stuck On

Typical Scan Tool Data

Variable High Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module monitors the Clutch Slip parameters for each Hybrid/EV Transmission Mode Command state. Low clutch slip speed when the clutch is commanded Off indicates a stuck or welded clutch condition. If the hybrid/EV powertrain control module 1 detects a stuck clutch condition, the hybrid/EV powertrain control module 1 will cycle the clutch 3 times within 30 seconds. The customer may feel 3 bumps before the DTC sets. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Variable high clutch (Clutch 2) is commanded Off.

No P179B, P1B0D, P1B0E, P1E4A, or P1E4B motor speed DTCs are set. Shutdown is not commanded.

Conditions for Setting the DTC

Clutch slip is less than 30 RPM 3 times within 1 s when clutch slip is expected.

Action Taken When the DTC Sets

P07A5 is a Type A DTC.

The hybrid/EV powertrain control module 1 inhibits mode 1.

The hybrid/EV powertrain control module 1 commands clutch 1 and clutch 2 Off.

The hybrid/EV powertrain control module 1 commands the internal combustion engine On.

Conditions for Clearing the DTC

P07A5 is a Type A DTC.

Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Verify that P0721, P077B-P077D or P215C is not set.

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Perform the Transmission Fluid Level and Condition Check to verify correct fluid level and condition. If the transmission fluid is low or discolored, refer to Transmission Fluid Drain and Fill.

3. Operate the vehicle within the Conditions for Running the DTC while observing the Clutch 2 Slip Speed parameter. The Clutch 2 Slip Speed parameter should display greater than 30 RPM when the Clutch 2 Status parameter displays Released.

If the DTC P07A5 is set, go to Component Testing.

Component Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps:

Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Verify correct oil pressure by performing the Line Pressure Check. If you found a concern, repair the concern.

3. Perform the Control Solenoid Valve Performance Test.

If a concern is found, replace the Q8 control solenoid valve assembly.

4. Inspect the valve body assembly for sticking or damaged valves. Refer Control Valve Body Diagnostic Inspection.

If you found a concern, repair or replace the valve or valve body.

5. Inspect the variable high clutch for a stuck On or damaged condition.

If you found a variable high clutch concern, repair or replace the variable high clutch assembly as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Variable High Clutch Removal, and Variable High Clutch Installation for variable high clutch replacement or overhaul.

Refer to Control Valve Body Replacement for control valve body replacement.

Perform the valve body inspection procedure, refer to Control Solenoid Valve Inspection. If the inspection procedure indicates to replace the valve body, refer to Control Valve Body Replacement.

Refer to Transmission Replacement for transmission removal.

Refer to Control Solenoid Valve Replacement for Q8 Control Solenoid Valve replacement.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P07A7: TRANSMISSION CLUTCH 3 STUCK ON

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P07A7

Transmission Clutch 3 Stuck On

Typical Scan Tool Data

Input Brake Clutch Reference

Circuit/System Description

The hybrid/EV powertrain control module 1 monitors the Clutch Slip 3 Speed for each Hybrid Transmission Mode Commanded state. Clutch 3 in the vehicle software is tied to the input brake clutch in the transmission. This is a one way mechanical clutch. The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

Clutch 3 command is Off.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 1 detects the clutch 3 Slip Speed is greater than 0 RPM for 1 s when commanded Off.

Action Taken When the DTC Sets

P07A7 is a Type A DTC.

The hybrid/EV powertrain control module 1 inhibits gear 1.

The hybrid/EV powertrain control module 1 commands the internal combustion engine Off.

Conditions for Clearing the DTC P07A7 is a Type A DTC. Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in

duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that the internal combustion engine (ICE) starts and stays running.

If the ICE does not start

Refer to Engine Will Not Crank - Crankshaft Will Not Rotate

If the ICE starts and stays running

2. All OK.

Component Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Inspect the input brake clutch for a broken or seized condition. The input break clutch should rotate freely in one direction and lock in the other direction.

3. If the input brake clutch tests OK, replace the T6 Power Inverter Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Seized Engine or Transmission Separation

Refer to Transmission Replacement for Transmission removal

Refer to Automatic Transmission Torque Dampener and Differential Housing Disassemble for Input Brake Clutch removal procedure

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Refer to Control Module References for T6 Power Inverter Module, replacement, programming, and setup. Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P0960, P0962, OR P0963: TRANSMISSION CONTROL SOLENOID VALVE 1 CONTROL CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P0960

Transmission Control Solenoid Valve 1 Control Circuit Open

DTC P0962

Transmission Control Solenoid Valve 1 Control Circuit Low Voltage

DTC P0963

Transmission Control Solenoid Valve 1 Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The line pressure control solenoid regulates the transmission fluid line pressure. The hybrid/EV powertrain control module 1 varies the current to the normally high line pressure control solenoid valve from 0.1 amp for maximum line pressure, to 1.1 amps for minimum line pressure. This is accomplished by varying the current in order to obtain the desired line pressure in kPa (psi). The hybrid/EV powertrain control module 1 is part of the drive motor generator power inverter module and is not serviced separately.

Conditions for Running the DTC

The propulsion system is active.

The system voltage is 11 - 18 volts.

Conditions for Setting the DTC

P0960

The transmission control module detects an internal electrical performance malfunction of the line pressure control solenoid control circuit for 5 s.

P0962

The transmission control module detects an internal low voltage electrical malfunction of the line pressure control solenoid control circuit for 400 milliseconds.

P0963

The transmission control module detects an internal high voltage electrical malfunction of the line pressure control solenoid control circuit for 400 milliseconds.

Action Taken When the DTC Sets

DTCs P0960, P0962 and P0963 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0960, P0962 and P0963 are Type A DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Vehicle ON, verify the transmission fluid temperature is between 50 - 80°C (122 - 176°F).

2. Drive the vehicle, observe the scan tool Line Pressure Control Solenoid Valve Test Status parameters. The reading should display OK.

If the reading is not within the specified value

Refer to Circuit/System Testing.

If the reading is within specification

3. All OK.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Remove the Control Valve Body Cover, refer to Control Valve Body Cover Replacement.

3. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Q23 Line Pressure Control Solenoid Valve.

4. Connect the 12 V battery.

5. Ignition ON, connect a test lamp between the Q23 Line Pressure Control Solenoid Valve circuit terminal A and the ground circuit terminal B.

6. Verify the test lamp turns ON and OFF when commanding the Line Pressure Control Solenoid Valve Increase and Decrease with a scan tool.

If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module.

2. Test for infinite resistance between the control circuit and switched ground circuit to ground.

If less than infinite resistance, replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.

If infinite resistance

3. Test for less than 2 Ω in the control circuit and switched ground circuits end to end.

If 2 Ω or greater, replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.

If less than 2 Ω, replace the T6 Power Inverter Module.

If the test lamp is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.

If less than 1 V, replace the T6 Power Inverter Module.

If the test lamp turns ON and OFF

7. Replace the Q23 Line Pressure Control Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for T6 Power Inverter Module replacement.

Refer to Line Pressure Control Solenoid Valve Replacement for Q23 Line Pressure Control Solenoid Valve replacement.

Refer to Control Valve Assembly and Transmission Wiring Harness Removal to replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module is replaced. Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P0964, P0966-P0968, P0970, P0971, P2718, P2720, P2721, P2727, P2729, OR P2730: TRANSMISSION CONTROL SOLENOID VALVE 2, 3, 4 OR 5 CONTROL CIRCUIT(S)

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC P0964

Transmission Control Solenoid Valve 2 Control Circuit Open

DTC P0966

Transmission Control Solenoid Valve 2 Control Circuit Low Voltage

DTC P0967

Transmission Control Solenoid Valve 2 Control Circuit High Voltage

DTC P0968

Transmission Control Solenoid Valve 3 Control Circuit Open

DTC P0970

Transmission Control Solenoid Valve 3 Control Circuit Low Voltage

DTC P0971

Transmission Control Solenoid Valve 3 Control Circuit High Voltage

DTC P2718

Transmission Control Solenoid Valve 4 Control Circuit Open

DTC P2720

Transmission Control Solenoid Valve 4 Control Circuit Low Voltage

DTC P2721

Transmission Control Solenoid Valve 4 Control Circuit High Voltage

DTC P2727

Transmission Control Solenoid Valve 5 Control Circuit Open

DTC P2729

Transmission Control Solenoid Valve 5 Control Circuit Low Voltage

DTC P2730

Transmission Control Solenoid Valve 5 Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The hybrid/EV powertrain control module 1 supplies 12 volts to the clutch pressure control solenoid valve. The hybrid/EV powertrain control module 1 controls the pressure control solenoids through the clutch pressure control solenoid valve control circuits. The normally closed pressure control solenoid valve flows fluid to the appropriate transmission hydraulic circuit when commanded ON. The clutch pressure control solenoids are part of the control solenoid valve and are not serviced separately.

Conditions for Running the DTC

Propulsion system is active.

The system voltage is 9 - 16 V.

Conditions for Setting the DTC

P0964, P0968, P2718, P2727

The hybrid/EV powertrain control module 1 detects an open solenoid control circuit for 1 s.

P0966, P0970, P2720, P2729

The hybrid/EV powertrain control module 1 detects a low voltage solenoid control circuit for 1 s.

P0967, P0971, P2721, P2730

The hybrid/EV powertrain control module 1 detects a high voltage solenoid control circuit for 1 s.

Actions Taken When the DTC Sets

DTCs P0964, P0966, P0967, P0968, P0970, P0971, P2718, P2720, P2721, P2727, P2729, and P2730 are Type A DTCs.

P0964, P0967

The hybrid/EV powertrain control module 1 inhibits mode 1. The hybrid/EV powertrain control module 1 inhibits gear 1.

The hybrid/EV powertrain control module 1 inhibits commands the internal combustion engine On.

P0966

The hybrid/EV powertrain control module 1 inhibits mode 2.

The hybrid/EV powertrain control module 1 commands clutch 1 and clutch 2 Off.

P2718

The hybrid/EV powertrain control module 1 inhibits mode 2 and gear 1.

P2720

The hybrid/EV powertrain control module 1 inhibits mode 1.

The hybrid/EV powertrain control module 1 inhibits commands the internal combustion engine On.

P2721

The hybrid/EV powertrain control module 1 inhibits mode 2. The hybrid/EV powertrain control module 1 inhibits gear 1.

Conditions for Clearing the DTC

DTCs P0964, P0966, P0967, P0968, P0970, P0971, P2718, P2720, P2721, P2727, P2729, and P2730 are Type A DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Vehicle ON, verify the transmission fluid temperature is between 50 - 80°C (122 - 176°F).

2. Drive the vehicle in order to obtain single motor mode, observe the scan tool Pressure Control Solenoid Valve Performance Test Status parameters. The readings should display OK.

If the reading is not within the specified range

Refer to Circuit/System Testing.

If the reading is within specified range

3. All OK.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .

2. Remove the Control Valve Body Cover, refer to Control Valve Body Cover Replacement.

3. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly.

4. Connect the 12 V battery.

5. Ignition ON, connect a test lamp between the control circuit terminal and the ground circuit terminals listed below:

Solenoid valve 2, high side driver circuit terminal 1 to control circuit terminal 2 Solenoid valve 3, high side driver circuit terminal 7 to control circuit terminal 8 Solenoid valve 4, high side driver circuit terminal 7 to control circuit terminal 6 Solenoid valve 5, high side driver circuit terminal 7 to control circuit terminal 5

6. Verify the test lamp turns ON and OFF when commanding the Pressure Control Solenoid Valve On and Off with a scan tool for each corresponding solenoid.

If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve.

If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve. If less than 2 Ω, replace the T6 Power Inverter Module.

If the test lamp is always ON

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the T6 Power Inverter Module.

If the test lamp turns ON and OFF

7. Replace the Q8 Control Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for T6 Power Inverter Module replacement.

Refer to Control Solenoid Valve Replacement for Control Solenoid Valve replacement.

Refer to Control Valve Assembly and Transmission Wiring Harness Removal for Automatic Transmission Wiring Harness - Control Solenoid Valve replacement.

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P152A OR P152D: REGENERATIVE BRAKING CONTROL SWITCH 1 CIRCUIT/REGENERATIVE BRAKING CONTROL SWITCH 1 AND 2 CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P152A

Regenerative Braking Control Switch 1 Circuit

DTC P152D

Regenerative Braking Control Switch 1 and 2 Circuit

Diagnostic Fault Information

Regenerative Braking On Demand

Circuit/System Description

Regenerative Braking On Demand enables drivers to actively re-capture energy when slowing down, such as when approaching slower traffic or setting up for a tight turn. To engage Regenerative Braking On Demand, the driver releases the accelerator pedal and pulls back on the left steering-wheel paddle to begin regenerating electricity. When engaged, Regenerative Braking On Demand provides vehicle deceleration that is more than what a typical vehicle experiences while coasting or when the transmission shifter is in the L position, providing control and dynamic performance characteristics similar to downshifting in a manual-transmission vehicle. The feature does not bring the vehicle to a complete stop. Releasing the paddle cancels the Regeneration on Demand request, allowing the vehicle to coast normally. The driver can engage and disengage Regeneration on Demand as desired and as traffic conditions allow. When Regenerative Braking On Demand is requested, a signal is sent to the Body Control Module and then to the hybrid/EV powertrain control module 1 via serial data. The Regenerative Braking On Demand parameter is displayed as Inactive and Active on the scan tool. The Regenerative Braking On Demand parameter states are listed below:

Inactive - when the S2L automatic transmission manual shift switch-left is not switch is pressed Active - when the S2L automatic transmission manual shift switch-left is pressed

Conditions for Running the DTC

Propulsion system is active. Conditions for Setting the DTC P152A

The hybrid/EV powertrain control module 1 detects the Regenerative Braking On Demand is active for greater than

600 s.

P152D

The hybrid/EV powertrain control module 1 detects an invalid voltage regenerative braking on demand switch - left circuit for 60 s.

Action Taken When the DTC Sets

DTC P152A and P152D are Type C DTCs.

The hybrid/EV powertrain control module 1 disables regenerative braking on demand.

Conditions for Clearing the DTC

DTC P152A and P152D are Type C DTCs.

Diagnostic Aids

DTC P152A can be customer induced by holding regenerative braking control switch in the regeneration on demand position while driving for greater than 600 s. Verify the customer is not pressing the switch for greater than 600 s.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

INLINE HARNESS CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON, verify with a scan tool the following hybrid/EV powertrain control module 1 parameter displays the correct values the S2L automatic transmission manual shift switch-left state:

Regenerative Braking On Demand displays Inactive when not pressed. Regenerative Braking On Demand displays Active when pressed.

If the hybrid/EV powertrain control module 1 parameter is incorrect

Refer to Circuit/System Testing.

If the hybrid/EV powertrain control module 1 Regenerative Braking On Demand parameter is correct

2. After performing the above step, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S2L automatic transmission

manual shift switch-left. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal X1 3 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle ON.

4. Verify the scan tool Regenerative Braking On Demand parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the harness connector at the K9 BCM X3 connector.

2. Test for infinite resistance between the signal circuit terminal X3 21 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the K9 BCM.

If Active

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.

6. Verify the scan tool Regenerative Braking On Demand parameter is Active.

If not Inactive

1. Vehicle OFF, remove the jumper wire, disconnect the X3 harness connector at the K9 BCM, vehicle ON.

2. Test for less than 1 V between the signal circuit terminal 21 and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 BCM.

If Active

7. Test or replace the S2L automatic transmission manual shift switch-left.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Steering Wheel Replacement for S2L automatic transmission manual shift switch-left replacement. Refer to Control Module References for K9 BCM replacement, programming, and setup.

DTC P152C: REGENERATIVE BRAKING CONTROL SWITCH SIGNAL MESSAGE COUNTER INCORRECT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P152C

Regenerative Braking Control Switch Signal Message Counter Incorrect

Circuit/System Description

Hybrid Low Mode enables drivers to actively re-capture energy when slowing down, such as when approaching slower traffic or setting up for a tight turn. To engage hybrid low mode the shift lever is placed in low (L), the driver shift request, also known as the tap shift function is activated. The driver shift request allows the vehicle operator to switch from L2 to L1 pressing the minus (-) button and back to L2 by pressing the plus (+) button. The body control module (BCM) supplies a signal circuit to the automatic transmission manual shift switch. The automatic transmission manual shift switch has switches connected to a resistor array. When the lever is in the L position, a voltage drop occurs across the resistor network. When the plus or minus button is pressed, a corresponding voltage drop occurs across the resistor network. This voltage drop is monitored by the BCM. The BCM will send the request to the hybrid/EV powertrain control module 1 to perform the transition from L2 to L1 or if already in L1 then back to L2. When the shifter is moved the L position, the instrument cluster will display L2, the hybrid/EV powertrain control module 1 will command a higher level of regenerative braking than what is commanded in the D position.

When the minus (-) button is pressed, the L1 mode is commanded by the hybrid/EV powertrain control module 1. When the plus (+) button is pressed when in L1 mode the system will transition back to L2.

Conditions for Running the DTC The propulsion system is active. Conditions for Setting the DTC

The hybrid/EV powertrain control module has detected a drive mode signal rolling count error for 0.8 seconds.

Action Taken When the DTC Sets DTC P152C is a Type C DTC. Conditions for Clearing the DTC DTC P152C is a Type C DTC. Diagnostic Aids

When attempting to set hybrid/EV powertrain control module serial data DTCs, run the vehicle in propulsion system active mode for at least 1 minute, and then shut the vehicle off for 30 seconds. Following this procedure will allow for a complete hybrid/EV powertrain control module shutdown.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Run the vehicle in propulsion system active mode for 1 minute, then vehicle OFF for 30 seconds.

2. Verify DTC P152C is not set.

If the DTC is set

1. Program the T6 Power Inverter Module.

2. Verify the DTC does not set.

If the DTC is set, replace the T6 Power Inverter Module. If the DTC does not set

3. All OK.

If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for T6 Power Inverter Module replacement, programming and setup.

Refer to Solenoid Valve Characterization Reprogramming if the T6 Power Inverter Module is programed or replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P16F7: CONTROL MODULE PRESSURE CONTROL SOLENOID COMMAND INCORRECT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P16F7

Control Module Pressure Control Solenoid Command Incorrect

Circuit/System Description

This is an internal fault detection of the hybrid/EV powertrain control module 1 or drive motor control modules. The hybrid/EV powertrain control module 1 and both drive motor control modules are internal to the power inverter module, often referred to as the drive motor generator power inverter module, and not serviced separately. This fault is handled inside the power inverter module, and no external circuits are involved.

Conditions for Running the DTC

The vehicle is ON.

The system voltage is greater than 9.5 V.

Conditions for Setting the DTC

The control module has detected an internal malfunction.

Action Taken When the DTC Sets

DTC P16F7 is a Type A DTC.

The hybrid/EV powertrain control module 1 requests the hybrid/EV powertrain control module 2 to open the high voltage contactor relays.

Conditions for Clearing the DTC DTC P16F7 is a Type A DTC. Reference Information

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

1. Vehicle ON.

2. Verify DTC P0562 is not set.

If the DTC is set

Refer to DTC B1325, B1330, B1517, C0800, C0899, C0900, C12E1, C12E2, P0561-P0563, P1A0C, P1A0D, or P1EFC .

If the DTC is not set

3. Verify DTC P16F7 is not set.

If the DTC is set

1. Program the T6 Power Inverter Module.

2. Verify the DTC does not set.

If the DTC sets, replace the T6 Power Inverter Module. If the DTC does not set.

3. All OK

If the DTC is not set

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for T6 Power Inverter Module, often referred to as the Drive Motor Generator Power Inverter Module, replacement, programming, and setup

Refer to Solenoid Valve Characterization Reprogramming when the T6 Power Inverter Module, Valve Body, or Q23 Line Pressure Control Solenoid is replaced.

Perform the Reset Transmission Adapts following all transmission related repairs.

DTC P179C: TRANSMISSION CLUTCH 1 MINOR SLIP DETECTED

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P179C

Transmission Clutch 1 Minor Slip Detected

Typical Scan Tool Data

Variable Low Clutch Reference