Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, engine OFF, verify with a scan tool the TFP Switch 4 parameter is Low.
- Engine running, verify with a scan tool the TFP Switch 4 parameter is Low with selector in reverse and High with selector in all other positions.