Action Taken When the DTC Sets: P0977
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.
- P0977 is a Type A DTC.
- The TCM inhibits 4th gear.
- The TCC commands maximum line pressure.
- The TCM freezes transmission adaptive functions.