What Is a Powertrain Control Module?

What Is a Powertrain Control Module? thumbnail
Microprocessors controls the functions of modern engines.

The powertrain control module (PCM) is the onboard computer of the car. It is the heart of the engine control system. The PCM controls the charging, transmission and emission systems. It also communicates with other onboard control modules.

  1. History of the PCM

    • Ford's first PCM was called Electronic Engine Control (EEC) and appeared in the 1980 Marquis and Ford LTD. General Motors introduced Computer Command Control in 1982 for its Buicks.

    How the PCM Works

    • The PCM is connected to operating hardware such as electric motors and solenoids via electrical terminals. The PCM issues commands that adjust the powertrain's functions. Sensors and battery voltage power the PCM.

    Truck Applications

    • In 1990, PCMs were applied to heavy truck applications. The Caterpillar 3176 and 3406 diesel engines came with an electronic engine control known as the Electronic Control Module (ECM).

    Causes of Failure

    • Voltage overload, vibration, heat stress and corrosion can cause failures of the PCM. Poor electrical connections also can cause the PCM to malfunction.

    Location of PCMs

    • The location of the PCM varies between car and truck models. They can be behind the instrument panel and buried underneath other components, such as the stereo. Other locations can be in the engine compartment or under a seat.

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  • Photo Credit hybrid module image by Rob Hill from Fotolia.com

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