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.

A faulty or malfunctioning transmission can trigger the check engine light for a handful of reasons, including things like an overheating gearbox or issues with the transmission control module ...

A fix is now available for 2021 Cadillac CT5 sedans affected by an Engine Control Module (ECM) issue leading to non-reporting of catalytic converter faults.