Exhaust Brake Function - If Equipped

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.

The exhaust brake feature can be used to provide additional braking when the vehicle is decelerating with a heavy load, and/or down a steep grade. A switch provides an input to the body control module (BCM). The BCM sends an exhaust brake request to the ECM via the control area network (CAN). The engine control module (ECM) processes the request and controls exhaust brake operation based on various sensor inputs. The ECM commands the turbocharger vane position to maximum boost for exhaust brake operation. Any malfunction of the Turbocharger or related engine controls hardware will set a powertrain DTC. If the exhaust brake feature does not function properly and there are no DTCs, the exhaust brake switch and related circuit should be diagnosed.