1999-2004 Jeep Grand Cherokee PCM Replacement

How to replace a PCM in a 1999-2004 Jeep Grand Cherokee 4.7L. The Powertrain Control Module (PCM) in your Jeep is designed to serve as the brain of your vehicle's engine. The PCM is what is often referred to as your Jeep's "computer." It controls a variety of functions, including how your engine runs and the individual sensors that provide it with information.

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