Due to some unfortunate luck, GM will be voluntarily recalling a good portion of their models to make a repair. The problem being addressed is to a potentially faulty exhaust particulate matter sensor. This sensor is used as a measuring tool in the diagnostic system to monitor the amount of soot is running through the exhaust.

The recalled vehicles that are suspected to have the faulty part include some 2016 model year Chevrolet Colorados’ and GMC Canyons; 2017 model year Chevrolet Express and GMC Savanna Vans; 2017-2018 model year Colorado’s, Cruzes, HD Silverado’s, GMC Canyons, and HD Sierra’s; along with 2018 model year Equinoxes and Terrains equipped with GM’s new 1.6-liter diesel engine.

GM has decided to recall these vehicles in order to reprogram the ECM (Engine Control Module) which may not properly detect and/or diagnose a failure with the sensor in question (exhaust particulate matter sensor) if a failure occurred.

A known side effect of the 2017 HD Silverado’s and Sierra’s are engine surging up to 2,800-rpm while coasting or braking, but only in rare circumstances. GM will begin notifying the affected owners of these vehicles shortly, and the local dealer will be tasked with the repair job in reprogramming the ECM’s.

The reprogram shouldn’t take much longer than an hour. GM also says eligibility for the ECM reprogramming won’t be affected by the presence of non-GM parts or service work performed by third parties. Therefore, you aren’t forced to take it to your local GM dealer for repair.