Action Taken When the DTC Sets: P1631

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1631 is a Type A DTC.
The TCM turns OFF all high side drivers.
The TCM turns OFF all solenoids.
The TCM commands maximum line pressure.
The TCM freezes transmission adaptive functions.
The TCM commands the TCC OFF.
The TCM allows the vehicle to operate in transmission protection mode.