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 any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- 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 in the hybrid powertrain control module and not the transmission control module, replace the hybrid powertrain control module.