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What does the PCM stand for, and what does it control?
 

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A powertrain control module (PCM) is the "brains" of your car. It is basically a printed circuit board computer that sends electronic signals to all of the different components in the engine, and tests the temperature and airflow around them, to check on the status of their operation. The control module examines the camshaft, coolant levels, crankshaft, ignition and valve timing, air intake and the turbocharger components in a car. It automatically regulates the ratio of air to fuel used in the engine and controls the idle speed so that the vehicle operates at peak performance levels. The module also works in conjunction with the catalytic converter to reduce the amount of pollutants expelled with the engine's exhaust and maintains the speed of the vehicle when the cruise control feature is turned on.
 

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Are there updates for the PCM from time to time, and if so how do we find out? My car is an 08 SRT8.
 

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Yes, they do have updates to the PCM every once in awhile. The only way to find out is to go the dealer and have it put on the computer, it will tell them if a new version is available for your car.
 

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A powertrain control module (PCM) is the "brains" of your car...
more like the heart. the PCM really only controls the engine and sometimes the trans (like in my car). the brain would be the TIPM (totally integrated power module). the TIPM is the module that controls all other modules.

like cuda said, the PCM is a computer module that basically turns the fuel injector(s) on/off based off the info received from a few sensors in and around the motor.
 
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