Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTCs P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 are not set.
- If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Perform the Transmission Fluid Check to verify correct fluid level.
- Perform the Line Pressure Check to verify correct oil pressure.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection to verify control solenoid valve assembly condition.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test to verify control solenoid valve assembly function.
- Inspect the trans fluid pump ball check valve for possible sticking or damage.
- If you found a concern with this check ball, repair the concern.
- Inspect the hybrid low, 1-2 clutch boost valve assembly for sticking or damage.
- If you found a concern with the hybrid low, 1-2 clutch boost valve assembly, repair or replace the valve or valve body.
- Inspect the 1-3 clutch assembly for a slipping or damaged condition.
- If you found a 1-3 clutch assembly concern, repair or replace the 1-3 clutch assembly as necessary.