Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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.