1. If equipped with regular production option (RPO) HP2, disconnect the energy storage box (ESB). Refer to Hybrid Battery Service Disconnect/Connect in Engine Electrical.
2. Remove the engine sight shield, if required. Refer to Upper Intake Manifold Sight Shield Replacement .
3. Remove the connector position assurance (CPA) lock (5).
4. Disconnect the main electrical connector (4) to the ignition coil wire harness.
5. Remove the harness clips (1).
6. Reposition the engine harness, if necessary.
7. Remove the spark plug wires from the ignition coils.

•	Twist each plug wire 1/2 turn.

•	Pull only on the boot in order to remove the wire from the ignition coil.




8. Reposition the surge tank/heater hoses from the heater hose bracket.
9. Remove the heater hose bracket nut and bracket.



10. If equipped with RPO HP2, remove the auxiliary heater water pump bracket nuts (4).
11. Remove the auxiliary heater water pump from the studs, and reposition out of the way.



12. If equipped with RPO HP2, remove the starter/generator control module (SGCM) cover bolts, and cover.
13. Remove the 3-phase cable nuts to the SGCM.
14. Remove the 3-phase cable from the SGCM.



15. If equipped with RPO HP2, remove the 3-phase cable bracket nuts (2).
16. Remove the 3-phase cable bracket (1) from the studs, and reposition the cable and bracket out of the way.



17. Remove the ignition coil bracket studs.
18. Remove the ignition coil bracket.



19. Remove the positive crankcase ventilation (PCV) hose.



20. Loosen the valve rocker arm cover bolts.
21. Remove the valve rocker arm cover.



22. Remove and discard the old gasket (1).



23. Remove the oil fill tube from the rocker cover, if required.
24. If required, clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection .

Important: 

1. Lubricate the O-ring seal of the NEW oil fill tube with clean engine oil.
2. Insert the NEW oil fill tube into the rocker arm cover.

Rotate the tube clockwise until locked in the proper position.

3. Install the oil fill cap into the tube.

Rotate the cap clockwise until locked in the proper position.




4. Install a NEW rocker cover gasket (1) into the valve rocker arm cover lip.

Notice: Refer to Fastener Notice in the Preface section.




5. Install the valve rocker arm cover.
6. Tighten the rocker arm cover bolts.

Tighten
Tighten the bolts to 12 N·m (106 lb in).




7. Install the PCV hose.



8. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the bracket bolts.
9. Install the ignition coil bracket.
10. Install the ignition coil bracket studs.

Tighten
Tighten the studs to 12 N·m (106 lb in).




11. If equipped with RPO HP2, position the cable (w/bracket) and install the 3-phase cable bracket to the studs.
12. Install the 3-phase cable bracket nuts (2).

Tighten
Tighten the nuts to 15 N·m (11 lb ft).




13. If equipped with RPO HP2, install the 3-phase cable to the SGCM.
14. Install the 3-phase cable nuts to the SGCM.

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

15. Install the SGCM cover and bolts.

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




16. If equipped with RPO HP2, position the auxiliary heater water pump and install it onto the studs.
17. Install the auxiliary heater water pump bracket nuts (4).

Tighten
Tighten the bolts to 15 N·m (11 lb ft).




18. Install the heater hose bracket and nut.

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

19. Position the surge tank/heater hoses to the heater hose bracket.



20. Install the spark plug wires to the ignition coils.
21. Position the engine harness, if necessary.
22. Install the harness clips (1).
23. Connect the main electrical connector (4) feeding the ignition coils.
24. Install the CPA lock (5).
25. Install the engine sight shield, if required. Refer to Upper Intake Manifold Sight Shield Replacement .
26. If equipped with RPO HP2, connect the ESB. Refer to Hybrid Battery Service Disconnect/Connect in Engine Electrical.