Transmission Control Module (TCM) faults are not unknown on these early Mazda 3s. Symptoms usually involve erratic shifting, a failure to select gear at all and having the car go into limp-home mode.

General Motors has issued a service update to address an issue related to the transmission control module (TCM) in certain examples of the 2020 model year Chevy Silverado HD and GMC Sierra HD pickup ...

Having a basic understanding of automotive acronyms is important. Some, like ABS (Anti-lock Braking System) and DOHC (Dual Over Head Camshafts), represent commonly advertised automotive features, ...