Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the scan tool ECM PNP Switch parameter while shifting the transmission through each range. The reading should change between Park/Neutral and In Gear.
- If not the specified value, refer to PNP Switch Malfunction below.
- Command the Starter Relay ON with the scan tool, or turn the ignition switch to the START position. The starter solenoid should click and the engine should crank.
- If the solenoid does not click, refer to STRTR Relay Malfunction below.
- If the solenoid clicks but the engine does not crank, refer to Starter Solenoid Clicks, Engine Does Not Crank .