Volt

DTC P07A3

The hybrid/electric vehicle (EV) powertrain control module 1 monitors the variable low and 1-2 reverse 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.

Variable low and 1-2 reverse clutch (C1) is commanded OFF.

Clutch slip is less than 30 RPM 3 times within 30 seconds.

P07A3 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, P0797, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, 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 Dual Electric Motors and ICE mode 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.

1. Perform the Line Pressure Check .
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 a stuck or damaged valve, repair or replace the valve or valve body.

4. Inspect the variable low and 1-2 reverse clutch for a stuck On or damaged condition.

⇒	If you found cause for concern in the variable low and 1-2 reverse clutch, repair or replace the variable low and 1-2 reverse clutch assembly as necessary.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.