Circuit/System Verification
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the DTC information with a scan tool. DTC P0601, P0602, P0604 and P0606 should not set.
- If DTC P0601 or P0604 failed this ignition, replace the ECM.