Diagnostic Fault Information

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.

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

Component	Cause	DTCs
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	P2723
Lower Control Valve Body Assembly	Clutch select valve 3 stuck OFF - debris, sediment, binding or scored bore	P2723
Upper Control Valve Body Assembly	1-2-3-4 Clutch regulator valve stuck - debris, sediment, binding or scored bore	P2723
Fluid Pump Cover Assembly	Fluid pump cover pump damage or debris between torque converter housing causing pump slide damage Fluid pump cover vanes and fluid pump rotor broken	P2723