Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Mode shifting is disabled until the ATC motor learn procedure has been performed.
The SERVICE 4WD indicator illuminates.
No mode position LED's illuminated.