Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
Ignition ON, verify the scan tool hood position parameter displays Open.
- If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.

Monitor the ABS DTCs on the scan tool.

If any ABS DTCs are set, diagnose those first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
If there are no ABS DTCs set, refer to Symptoms - Antilock Brake System .