Circuit/System Testing
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.
Observe the DTCs in the scan tool
- If DTC P0604 is set, replace the ECM.
- If DTC P0604 is not set, replace the TCM.