LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2012 >> Grand Cherokee Laredo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Electronic Control Modules (Service Information)) >> Module, Powertrain Control >> Installation >> Installation - Pcm
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Installation - Pcm

WARNING: This page is about a different car, the 2011 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

Certain ABS systems rely on having the Powertrain Control Module (PCM) broadcast the Vehicle Identification Number (VIN) over the bus network. To prevent problems of DTCs and other items related to the VIN broadcast, it is recommend that you disconnect the ABS CAB (controller) temporarily when replacing the PCM. Once the PCM is replaced, write the VIN to the PCM using a diagnostic scan tool. This is done from the engine main menu. Arrow over to the second page to "1. Miscellaneous". Select "Check VIN" from the choices. Make sure it has the correct VIN entered before continuing. When the VIN is complete, turn off the ignition key and reconnect the ABS module connector. This will prevent the setting of DTCs and other items associated with the lack of a VIN detected when you turn the key ON after replacing the PCM.

CAUTION:

Use a diagnostic scan tool to reprogram the new PCM with the vehicles original identification number (VIN) and the vehicles original mileage. If this step is not done, a Diagnostic Trouble Code (DTC) may be set.

Fig 1: Powertrain Control Module (PCM), Screws & Connector
GC0145725Courtesy of CHRYSLER LLC
  1. Position the PCM (1) onto the mounting bracket located on the TIPM.
  2. Position the ground strap (2), install the retaining bolts (3) and tightened to 9 N.m (80 in. lbs.).
    Fig 2: Powertrain Control Module (PCM)
    GC0145741Courtesy of CHRYSLER LLC
  3. Check the pin connectors in the PCM. Also check the 38-way connectors (2) for corrosion or damage. Repair as necessary.
  4. Carefully plug the 38-way connectors (2) into the PCM (1).
    Fig 3: Negative Battery Cable
    GC0145484Courtesy of CHRYSLER LLC
  5. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
    NOTE:

    If the original Vehicle Identification Number (VIN) and original vehicle mileage is not programed into the PCM, a Diagnostic Trouble Code (DTC) may be set.

  6. If installing a new PCM, use a diagnostic scan tool to reprogram the new PCM with the vehicles original VIN and mileage.
scientia non olet · About LEMON Manuals