Volt

DTC P07A5

The hybrid/electric vehicle (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.

Variable high and 2-3-4 clutch is commanded Off.

P07A5 is a Type A DTC.

P07A5 is a Type A DTC.

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.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

1. Verify that P0721, P0776, P0777, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P0AB9, P1B03, P1B04, P215C, P2720, P2721, P2728, P2729, or P2730 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 discoloured, refer to Transmission Fluid Replacement .

3. Operate the vehicle in Single Electric Motor or Single Electric Motor and ICE mode 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.

1. Perform the Line Pressure Check .

⇒	If you found cause for concern, take corrective action.

2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .

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

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

⇒	If you found cause for concern, repair or replace the valve or valve body.

4. Inspect the variable high and 2-3-4 clutch for a stuck On or damaged condition.

⇒	If you found cause for concern in the variable high and 2-3-4 clutch, repair or replace the variable high and 2-3-4 clutch assembly as necessary.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.