GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Avalanche - 4WD 🢒 Engine 🢒 Engine Controls and Fuel - Hybrid (HP2) 6.0L (LFA) 🢒 Ignition Coil Replacement

Removal Procedure

    Object Number: 1966180 Size: SH
  1. Remove the intake manifold sight shield, as required. Refer to Upper Intake Manifold Sight Shield Replacement.
  2. If replacing one of the rear 2 ignitions coils on the right side perform steps 3 through 13, otherwise proceed to step 14.

    3. Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure will perform the following tasks:

       â€¢ Identify how to disable high voltage.
       â€¢ Identify how to test for the presence of high voltage.
       â€¢ Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
    Failure to follow the procedures exactly as written may result in serious injury or death.

  3. Perform the service disconnect. Refer to High Voltage Disabling.
  4. Disconnect the engine wiring harness electrical connector (3) from the drive motor generator power inverter module cover.
  5. Loosen the drive motor generator power inverter module cover bolt (1).
  6. Remove the drive motor generator power inverter module cover (2).

    7. Object Number: 1965809 Size: SH
  7. Remove the generator control module 3 phase cable clip nut (1).
  8. Remove the generator control module 3 phase cable clip from the engine bracket (2).
  9. Reposition the generator control module 3 phase cables out of the way.
  10. Remove the right wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side.

    11. Object Number: 1965810 Size: SH
  11. Working through the wheel opening, remove the engine bracket bolts (2).
  12. Lower the vehicle.
  13. Remove the engine bracket nut (1) from the ignition coil bracket stud and remove the bracket (3).

    14. Object Number: 1707122 Size: SH
  14. Disconnect the ignition coil wiring harness electrical connector (1) from the ignition coil.

    15. Object Number: 1707124 Size: SH
  15. Remove the spark plug wire from the ignition coil.
    16. • Twist the spark plug wire boot a 1/2 turn.
    • Pull only on the boot in order to remove the wire from the ignition coil.
  16. Remove the ignition coil bolts.
  17. Remove the ignition coil from the bracket.
  18. There are 2 different manufacturers for the ignition coils and coil brackets. They are as follows:

    19. Object Number: 260177 Size: SH
  19. The Melco® (1) ignition coil is a square design.
  20. The Delphi® (2) ignition coil is a round design.

    21. Object Number: 260077 Size: SH
  21. The Melco® ignition coil bracket (1) is a square design.
  22. The Delphi® ignition coil bracket (2) is a round design.

Installation Procedure

    Object Number: 1707124 Size: SH
  1. Position the ignition coil to the ignition coil bracket.

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the ignition coil bolts.

    3. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  3. Install the spark plug wire to the ignition coil.
  4. Inspect the spark plug wire for proper installation:
    5. • Push sideways on each boot in order the inspect the seating.
    • Reinstall any loose boot.

    Object Number: 1707122 Size: SH
  5. Connect the ignition coil wiring harness electrical connector (1) to the ignition coil.
  6. If replacing one of the rear 2 ignitions coils on the right side perform steps 7 through 16, otherwise proceed to step 17.

    7. Object Number: 1965810 Size: SH
  7. Install the engine bracket (3) to the ignition coil bracket stud and install nut (1).

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

  8. Raise the vehicle half way.
  9. Working through the wheel opening, install the engine bracket bolts (2).

    10. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 1965809 Size: SH
  10. Install the right wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side.
  11. Position the generator control module 3 phase cables to the bracket channel.
  12. Install the generator control module 3 phase cable clip to the tab (3) on the engine bracket (2).
  13. Install the generator control module 3 phase cable clip nut (1).

    14. Tighten
    Tighten the nut to 9 N·m (80 lb in).


    Object Number: 1966180 Size: SH
  14. Install the drive motor generator power inverter module cover (2).
  15. Tighten the drive motor generator power inverter module cover bolt (1).

    16. Tighten
    Tighten the bolt to 1.5 N·m (13 lb in).

  16. Connect the engine wiring harness electrical connector (3) to the drive motor generator power inverter module cover.
  17. Install the intake manifold sight shield, as required. Refer to Upper Intake Manifold Sight Shield Replacement.
  18. Perform the service reconnect. Refer to High Voltage Enabling.