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The Engine Control Module, or ECM, directly controls the engine. Still, it can’t do that properly without the Transmission Control Module or TCM and PCM, which work together and exchange information.

The engine control module, or ECM, controls plenty of functions during routine driving, so any issues with that part could cause severe problems.

Although “ECU” typically stands for engine control unit, it could also mean electronic control unit. Here’s what those mean.