Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. 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 freezes transmission adaptive functions.
The TCM inhibits 4th gear.

P2763

DTC P2763 is a type B DTC.
The TCM commands maximum line pressure.
The TCM freezes transmission adaptive functions.
The TCM forces the TCC solenoid OFF.
The TCM inhibits TCC engagement.
The TCM inhibits 4th gear when in Hot Mode.