Volt

DTC P07A7

The hybrid/electric vehicle (EV) powertrain control module 1 monitors the clutch slip speed for each Hybrid/EV Transmission Mode Command. When the 1-3 Reverse Clutch is commanded OFF, low clutch slip speed 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 1-3 Reverse Clutch is commanded OFF for 3 seconds and the hybrid/EV powertrain control module 1 detects the clutch 3 slip speed is less than 100 RPM for 3 seconds, when commanded OFF.

DTC P07A7 is a Type A DTC.

DTC P07A7 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, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, 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 transmission in Single Electric Motor or Dual Electric Motors modes while observing the Clutch 3 Slip Speed parameter. The Clutch 3 Slip Speed parameter display should be greater than 100 RPM when the Clutch 3 Status parameter displays Released.

⇒	If the DTC P07A7 is set, refer 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 shift solenoid valve for stuck or damaged condition.

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

4. Inspect the 1-3 reverse clutch assembly for a stuck ON or damaged condition. Refer Control Valve Body Diagnostic Inspection .

⇒	If you found cause for concern in the 1-3 reverse clutch assembly, repair or replace the low and reverse clutch assembly as necessary.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.