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.
- Ignition OFF, inspect the engine wiring harness carrying the crankshaft position sensor circuits for the following conditions:
- Close routing of aftermarket electrical equipment
- Close to solenoids, motors, and relays
- If any of these are determined to be a possible source of electrical interference, correct any wire harness routing or component placement conditions.
- Start the engine.
- If the engine does not start, proceed with Circuit/System Testing.
- Engine idling, observe the scan tool Crankshaft Position Active counter parameter. The parameter should be incremnting.
- Engine idling, observe the DTC information with a scan tool. DTC P0336 should not set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.