Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.

Diagnose all other stop lamp DTCs or symptoms prior to performing this diagnostic procedure.
DTC C0161 may set if the brake pedal is applied while accelerating, such as two footed driving.