Diagnostic Aids

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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.