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.
A loose connection on the battery positive voltage circuit terminal 1 X2 of the IAH, or at the 175A Mega Fuse terminal 1 X4 of the Underhood Fuse Holder, may cause this DTC to set.