Diagnostic Aids
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.
If there is a loss of ignition voltage to the ECM terminal X1-76 this DTC may set. Verify this circuit is not shorted to ground or open. Verify the supply fuse for this circuit is not open.