GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Kodiak C-Series (Conventional) C6/C7/C8 🢒 Engine 🢒 Engine Controls and Fuel - 7.8L (LF8) 🢒 Engine Control Module Replacement

Notice: 

   • Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.
   • Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
   • In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
   • Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.
   • The replacement control module must be programmed.

Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

Removal Procedure

    Object Number: 1910677 Size: SH
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Retrieve the fuel flow rate data. Refer to Fuel Injector Flow Rate Programming .
  3. Open the hood.
  4. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  5. Remove the air conditioning (A/C) accumulator bracket nuts (1).
  6. Remove the A/C accumulator bracket with accumulator from the studs and reposition out of the way.

    7. Object Number: 1910680 Size: SH
  7. Disconnect the engine wiring harness electrical connector (1) from the ECM.

    8. Object Number: 1910683 Size: SH
  8. Disconnect the engine wiring harness electrical connector (1) from the ECM.

    9. Object Number: 1910685 Size: SH
  9. Remove the multi-use bracket tray side bolts (1).

    10. Object Number: 1910687 Size: SH
  10. Slide the multi-use bracket tray (1) (with ECM attached) out of the multi-use bracket.

    11. Object Number: 1910689 Size: SH
  11. Disengage the retaining tabs (2) on the bracket and remove the ECM (1).

Installation Procedure

    Object Number: 1910689 Size: SH
  1. Install the ECM (1) to the bracket and ensure that the ECM engages the retaining tabs (2).

    2. Object Number: 1910687 Size: SH
  2. Slide the multi-use bracket tray (1) (with ECM attached) into of the multi-use bracket.

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1910685 Size: SH
  3. Install the multi-use bracket tray side bolts (1).

    4. Tighten
    Tighten the bolts to 9 N·m (80 lb in).


    Object Number: 1910683 Size: SH
  4. Connect the engine wiring harness electrical connector (1) to the ECM.

    5. Object Number: 1910680 Size: SH
  5. Connect the engine wiring harness electrical connector (1) to the ECM.

    6. Object Number: 1910677 Size: SH
  6. Install the A/C accumulator bracket with accumulator.
  7. Install the A/C accumulator bracket nuts (1).

    8. Tighten
    Tighten the nuts to 9 N·m (80 lb in).

  8. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  9. If a new ECM was installed, program the ECM. Refer to Control Module References .
  10. Close the hood.