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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Trailer Brake Control System) >> Diagnostic Information and Procedures >> DTC C0845 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The ignition may need to be cycled twice, waiting 30 seconds between key cycles, to move the code from current to history

If there are any other DTCs set for GMLAN communication such as U0100, U0121, U0140, or U2099, diagnose them first before resolving DTCs described in this section.

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