2002 Jeep Liberty 3.7L 56041606AG – PCM ECM ECU Control Module (Engine Computer) Replacement

The Powertrain Control Module, or PCM, is a pre-programmed digital computer that operates the engine control system of a vehicle. It is sometimes referred to as JTEC. As the input data changes, the PCM adjusts its response to the various output devices it operates.  If the PCM, the “brains”, fails to work correctly, the rest of the engine will have issues as well. Luckily, if proper diagnosis points toward replacement of the PCM as the solution, the PCM can be easily replaced to fix the issue. We’ll show you how to replace a PCM ECM ECU Module on a 2002 Jeep Liberty.


Begin replacing the Jeep PCM of your 2002 Jeep Liberty by locating the module. The location of the PCM is in the engine compartment in the back right near the battery. Before we start, make sure to do this to ensure safe replacement. Turn off the ignition key and disconnect the negative battery cable before unplugging the PCM connectors. This will protect the PCM from possible voltage spike damage.


1- Disconnect the negative battery cable from the battery.

2- Remove cover over the electrical connectors. Cover the snaps onto the PCM.

3- Carefully unplug the three 32–way connectors from the PCM.

2002 Jeep Liberty Replacement 1

4- Remove the three PCM mounting bolts and remove the PCM from your vehicle.


1- Install the Jeep ECM and 3 mounting bolts to the vehicle.

2- Tighten bolts enough to keep PCM in place.

3- Before reconnection, check for damage or corrosion in the pins of the PCM and the three 32–way connectors. In the connectors, each pin’s height should be the same. If not damaged, continue.

4- Reconnect the three 32–way connectors.

5- Reinstall the cover over the electrical connectors. Then cover the snaps onto the PCM.

6- Reinstall the battery cable to finish the job.

We have a huge selection of Programmed 2002 Jeep Liberty PCMs if a replacement PCM is needed. The PCM you order with us is 100% ready for immediate installation. If you have any questions, please don’t hesitate to call our Customer Service department at 516-766-2223, we’re always here to help!

2002 Jeep Liberty 3.7L 56041606AG

Flagship One, Inc. brings the best service at the lowest prices.

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