Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

P0974

DTC P0974 is a Type B DTC.
The TCM commands maximum line pressure.
The TCM freezes transmission adaptive functions.

P0977

DTC P0977 is a Type A DTC.
The TCM commands maximum line pressure.
The TCM inhibits 4th gear.
The TCM freezes transmission adaptive functions.

P2763

DTC P2763 is a Type B DTC.
The TCM commands maximum line pressure.
The TCM forces TCC OFF.
The TCM inhibits 4th gear if in hot mode.
The TCM freezes transmission adaptive functions.