GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD (CNG) 🢒 Engine 🢒 Engine Controls - 6.0L 🢒 Alternative Fuels Engine Control Module Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the C/K Pickup service manual.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information in the C/K Pickup service manual.
  3. Remove the right side wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End in the C/K Pickup service manual.

    4. Object Number: 757004 Size: SH
  4. Remove the ECM hold-down bracket (6) bolts (5) from the ECM adapter bracket (4).
  5. Remove the ECM (7).
  6. Remove the connector position assurance locks and disconnect the electrical connectors from the ECM (7).

    7. If the ECM mounting and adapter brackets do not have to be removed proceed to Step 3 of the Installation Procedure.

  7. Remove the ECM adapter bracket (4) bolts (8) from the ECM mounting bracket (3).
  8. Remove the ECM adapter bracket (4) from the vehicle.
  9. Remove the ECM mounting bracket (3) bolts (2).
  10. Remove the ECM mounting bracket (3) from the vehicle.

Installation Procedure

    Object Number: 757004 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the ECM mounting bracket (3) loosely into the vehicle using the three mounting bolts (2).

    2. Tighten
    Tighten the bolts to 9 N·m(7 lb ft).

  2. Install the ECM adapter bracket (4) to the ECM mounting bracket (3) using the upper bolts (8).

    3. Tighten
    Tighten the bolts to 12 N·m(9 lb ft).

  3. Connect the electrical connectors to the ECM (7) and install the connector position assurance locks.
  4. Place the top of the ECM into the upper portion of the ECM adapter bracket (4).
  5. Ensure the ECM is properly positioned while installing the ECM hold-down bracket (6) and bolts (5) into the ECM adapter bracket (4).

    6. Tighten
    Tighten the bolts to 12 N·m(9 lb ft).

  6. Install the right side wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End in the C/K Pickup service manual.
  7. Lower the vehicle.

    8. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  8. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the C/K Pickup service manual.
  9. Program the ECM with the correct Alternative Fuels software.