Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. 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.