Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. 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.