Circuit Description
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The transmission control module (TCM) is equipped with an internal temperature sensor mounted directly to the TCM circuit board. The TCM will take action to protect against damage from overheating.
DTC P0634 is a type B DTC.