Plymouth PCM, ECM & ECU Listings

What a Plymouth PCM, ECM, and TCM Do

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A power-train control module, which is often abbreviated as PCM, is an automotive component, otherwise known as an electronic control unit or ECU, that is used specifically on motor vehicles. In Plymouth engine-computer listings, PCM or ECM names the engine controller. A separate transmission control module (TCM), where fitted, is a different part. On some cars, like Chrysler models, multiple separate computers including the PCM, the Transmission Control Unit, and the Body Control Module each run a different system. Often, these automotive computers are quite reliable because PCMs are used to control hundreds of vehicle features. Likewise, there are countless error codes that can possibly occur, which indicates that one section or another of the car is having some difficulty functioning. These errors will generally turn on the Check Engine light located on the dashboard. The PCMs, ECUs, ECMs, and TCMs are often referred to as the "brains" of the system because they have such an important functional role.

A Plymouth PCM reads sensors to manage engine operation. No-start, stalling, rough idle or a check-engine light can also come from wiring, power or sensor faults. Scan codes guide diagnosis; test the relevant circuits before concluding that the computer has failed.