2004 Jeep Liberty Limited, RWDFACTORY OEM SERVICE PROCEDURE

General Information: Notes

IMPORTANT: New for KJ, the Powertrain Control Module and Transmission Control Module have been combined into single control module on all vehicles equipped with a 2.4L and 3.7L engines. This new module is the Next Generation Controller (NGC). New Diagnostics procedures along with new DTC's are two of the changes you will see which reflect the new combined module technology. The NGC modules will have four color coded connectors Cl/A through C4/D, (Cl-BLK, C2-ORANGE, C3-WHITE, C4-GREEN). Each PCM connector has 38 pins. Two new tools were introduced to help diagnose and repair the new PCM (NGC) terminals and harness connectors. The Miller #3638 terminal removal pick must be used to release the connector terminals, or harness and connector damage will occur. Also, the Miller #8815 Pin Out Box was introduced. You must use the Miller #8815 tool instead of probing the PCM terminals, or harness and connector damage will occur. There is also a new Verification test and module replacement procedure for the new PCM.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.