At best, you’ll be able to repair or replace your PCM before anything else gets damaged. At the very least, you’ll eliminate a possible cheap repair option. If you’re experiencing any of these problems, it’s a good idea to have your codes read before spending a lot of money on mechanical repairs. Worse yet, rough shifting and poor engine timing can cause damage over time, which means that the longer the problem with your PCM goes undiagnosed, the more you’re likely to end up spending on repairs down the road. You could buy several PCMs for the cost of rebuilding one transmission. The main reason people spend so much on PCM repair is that many people, even professional mechanics, often misdiagnose PCM problems as engine or transmission issues, and attempt costly repairs to those systems. – Your Jeep is shifting erratically or seemingly at random.– Gas mileage has inexplicably gotten worse.

These codes all identify specific PCM problems. The most obvious is if your code scanner is reading any code that begins with “P06”. Common Symptoms of Jeep PCM Failureīecause your PCM controls many of your car’s systems, there are a large number of possible symptoms. It can also lead to backfiring, difficulty starting the engine, rough shifting, and rapid wear and tear on vital engine components. 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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