Diagnostic Fault Information

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 following fault table will help determine if a hydraulic circuit or an incorrect position or application of a component affects the transmission operation.

Component	Cause	DTCs
Lower Control Valve Body	Clutch select valve 3 stock - debris, sediment, binding or scored bore	P0756
1-2-3-4 and 3-5-R Clutch Housing Assembly	1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over-travel and cut 1-2-3-4 clutch piston seal	P0756
Control Solenoid (w/body and TCM) Valve Assembly	Clutch Pressure Control Solenoid 2: Not exhausting - Stuck Off Needle piston or armature pin binding Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal O-ring seals leaking	P0756
Center Support Assembly	Lube hole blocked, incorrectly drilled or omitted	P0756
Fluid Pump Cover Assembly	Fluid pump cover vanes and fluid pump rotor broken	P0756