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The PCM is the brains of the drivetrain. it tells the transmission when to shift, the spark plugs when to spark, how much fuel to inject, among many many other functions. if it has to do with making your wheels turn and is controlled by computer, the PCM does it. and in modern cars, pretty much everything is controlled by the computer.

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Q: What is the purpose of a power control module in a vehicle?
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What does a PCM power relay control?

The Powertrain Control Module is the vehicle's computer

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Most of the tiime, yes.

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The 2004 Dodge Intrepid PCM power control module can be found on the firewall in the engine compartment. The PCM power control module will be on the passenger side of the firewall.

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