The fix: dealers will reprogram the ECM in affected Chevy Trailblazer units, free of charge to vehicle owners. Affected components: engine control module (ECM). Affected vehicles: 2021 Chevy ...

Tim Shick, vice-president of sales support with Navistar, said most of the problems could be traced to the MaxxForce engine’s turbo air control valve, which connects directly to the engine’s ...

The Engine Control Module (ECM) is the computer responsible for controlling the engine. The ECM communicates with other vehicle control units via a communication bus.