How To Replace a Power Control Module on a Jeep Grand Cherokee

If you own a Grand Cherokee Jeep, there is a great chance that you would find yourself changing its Power Control Module (PCM) sooner or later. Almost all of the cars have their own flaws and sicknesses, and for the Grand Cherokee Jeep, it is almost always that it is its PCM that has to be repaired or worse, to be replaced. Some of the symptoms of a broken PCM are the Jeep won’t start, it won’t shift gears, its fuel gauge appears empty although it’s filled with gas, etc. When any of these symptoms happens to you, call your car dealer to make sure if the problem is really with the PCM.

In case your PCM breaks, you really do not have to have it fixed at expensive motor shops. With the right tools and knowledge, you can save a lot of money by doing it yourself at your own home. Just follow the simple instructions below on how to change or replace a Power Control Module on your Grand Cherokee Jeep.

  • Locate the PCM. The location of the PCM changes depending on what model of Jeep you have, but for sure, it is located under the hood and near the fender. For example, the PCM of a Grand Cherokee Jeep 2003 model is positioned just behind the coolant tank located on the passenger side of the automobile. To be sure, just check your user manual where the PCM is located. Remember that whatever model you have, its PCM would surely have wires connected to it.
  • Go for brand new or at least rebuilt PCM. Buying cheaper things does not always lead to savings. In fact, you may even end up spending more over time. So in buying a replacement PCM, do not buy refurbished PCMs although they worth a lot less than new ones. If you’re lucky enough, refurbished PCM may last until a year, but that is the max. Look for new PCM, or at the very least, look for rebuilt PCM. You wouldn’t want to change your PCM every 6 months or oftener. Needless to say, purchase the PCM that is compatible with your Jeep’s model.
  • Be safe. Before you remove the old PCM, make sure that the vehicle is not turned on. The safest way to do this is to remove the car key from the ignition. While you do not have to remove the battery of the Jeep, you have to see to it that no electric power flows to the PCM. It is better to be safe than sorry.
  • Remove the old PCM. To remove the PCM, you only have to follow a two-step procedure. First, unplug all the wires connected to it. Then second, remove all the mounting bolts attaching the PCM to the Jeep.
  • Replace the old PCM with a new one. In assembling the new PCM to the Jeep, just reverse the two-step procedure in the preceding paragraph. First, bolt the PCM down to the vehicle. Once the new PCM is attached securely to the Jeep, plug all its connecting wires.

Now your Grand Cherokee Jeep is once again ready for off-road tracks.


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