It then uses that information to make dozens of decisions per second, such as how much fuel to inject into each cylinder, when to fire the spark plugs and when an automatic transmission should shift to a different gear to deliver the best performance for the current conditions. The PCM receives signals from sensors that measure air flow into the engine and out the exhaust, the coolant temperature, how far down the accelerator pedals is, the speed at which each wheel is turning and other parameters. Related: What Is a Dual-Clutch Transmission? How Does the PCM Work?
It is just one of dozens of microprocessors on today’s vehicles that run everything from the climate control system to the power windows. It manages the engine, transmission and other systems based on information it receives from various sensors around the vehicle.
The powertrain control module, aka PCM, is your vehicle’s brain.
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