Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, verify that DTC P0562, P0563 in the ECM and/or B1325 are not set as current.
- If one of the specified DTCs is found as current, repair those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Verify that DTC C0899 or C0900 are current in the scan tool.
- If the DTC is not current, refer to Charging System Test .