![]() When your PCM fails, it can cause you to lose fuel efficiency and possibly fail your state’s emission inspection. The PCM controls the engine timing, the fuel to air ratio, the transmission, and the anti-lock brakes, along with dozens of other smaller functions. The Powertrain Control Module (PCM) is the computer that controls most of your Jeep’s essential systems. How To Know If You Need a Jeep PCM Replacement
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