Bulletin No.: PI0746B
Date: Oct-2012

Subject:

Malfunction Indicator Lamp (MIL) On, Poor Acceleration, Throttle Body Freezing, Multiple DTCs Set, Ice
Deposits and/or Oil Deposits Present in Air inlet Duct

Models:

2008-2011 Buick Enclave
2007-2011 Chevrolet Malibu
2009-2011 Chevrolet Traverse
2007-2011 GMC Acadia
2007-2010 Pontiac G6
2007-2010 Saturn OUTLOOK
Equipped with 3.6L Engine (RPOs LY7, LLT)

This PI is being revised to add the 2007-2010 G6 and update the 2007-2008 Parts Information. Please discard PI0746A.

Condition/Concern
Some customers may comment that the malfunction indicator lamp (MIL) is on.
They may also comment on poor engine performance and/or reduced acceleration.
The reduced engine power will be experienced after initial cold start up or driving in low ambient temperatures.

Technicians may find the presence of DTCs P0101, P0171, P0172, P0174, P0175, P1516, P2177, P2178, P2179, P2180, P2187, P2188, P2189, and/or P2190
along with either ice or oil deposits in the air inlet duct.
Ice formation is caused by condensation freezing at the base of the throttle body with additional collection of ice formation deposits in the air inlet duct. Freezing
condensation forms after the vehicle has been driven and then parked in low ambient temperatures.
Oil deposits are the collection of the engine vapors, fuel dilution and oil mist at the base of the throttle body with additional formation collecting in the duct.

Recommendation/Instructions (2007-2008 Enclave, Malibu, Traverse, Acadia, G6, OUTLOOK)
Use the following steps for servicing the positive crankcase ventilation (PCV) system for the models listed above.

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1.

Remove both camshaft covers for servicing of the PCV system. Refer to Camshaft Cover Replacement Left and Right Side in SI.

2.

Clean the PCV orifice with low VOC brake cleaner. Allow to air dry with compressed shop air.

3.

Replace the bank1 camshaft cover gasket.

4.

Reassemble the bank1 camshaft cover.
Tighten: Tighten the camshaft cover bolts to 10♦Y (89♦lb♦in).

5.

Replace the bank2 camshaft cover and replace the camshaft cover gasket.

6.

Reassemble the bank2 camshaft cover.
Tighten: Tighten the camshaft cover bolts to 10♦Y (89♦lb♦in).

7.

Install the insulated PCV tube.

Parts Information (2007-2008 Enclave, Malibu, Traverse, Acadia, G6, OUTLOOK)
Part Number

Description

12616913

Tube, PCV (Enclave, Traverse, Acadia, OUTLOOK)

12613199

Tube, PCV (Malibu, G6)

12647768

Cover, CM/SHF (LH) (LLT, LY7)

12641261

Seal, CM/SHR CVR (RH) (LLT, LY7)

Warranty Information
For vehicles repaired under the 5 year/100,000 mile (160,000 km) Powertrain Coverage (Code P) warranty, use
Labor Operation

Description

Labor Time

J7575*

Positive Crankcase Ventilation Tube/ Covers/ Seal (LLT)

4.6 hrs

Positive Crankcase Ventilation Tube/ Covers/ Seal (LY7)

3.2 hrs

*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.

Recommendation/Instructions (2009-2010 Enclave, Malibu, Traverse, Acadia, G6, OUTLOOK)
Use the following steps for servicing the positive crankcase ventilation (PCV) system for the models listed above.
1.

Remove both camshaft covers for servicing of the PCV system. Refer to Camshaft Cover Replacement Left and Right Side in SI.

2.

Clean the PCV orifice with low VOC brake cleaner. Allow to air dry with compressed shop air.

3.

Replace the bank1 camshaft cover gasket.

4.

Reassemble the bank1 camshaft cover.
Tighten: Tighten the camshaft cover bolts to 10♦Y (89♦lb♦in).

5.

Replace the bank2 camshaft cover and replace the camshaft cover gasket.

6.

Reassemble the bank2 camshaft cover.
Tighten: Tighten the camshaft cover bolts to 10♦Y (89♦lb♦in).

Parts Information (2009-2010 Enclave, Malibu, Traverse, Acadia, G6, OUTLOOK)
Part Number

Description

12647772

Cover, CM/SHF (LH) (LLT)

12647768

Cover, CM/SHF (LH) (LY7)

2

12641261

Seal, CM/SHR CVR (RH) (LLT, LY7)

Warranty Information
For vehicles repaired under the 5 year/100,000 mile (160,000 km) Powertrain Coverage (Code P) warranty, use
Labor Operation

Description

Labor Time

J7575*

Positive Crankcase Ventilation Tube/ Covers/ Seal (LLT)

4.6 hrs

Positive Crankcase Ventilation Tube/ Covers/ Seal (LY7)

3.2 hrs

*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
Use the following steps for servicing the positive crankcase ventilation (PCV) system for the models listed above.

Recommendation/Instructions (2011 Enclave, Malibu, Traverse, Acadia)
1.

Remove the bank2 camshaft cover for servicing of the PCV system. Refer to Camshaft Cover Replacement Left Side in SI.

2.

Clean the PCV orifice with low VOC brake cleaner. Allow to air dry with compressed shop air.

3.

Replace the bank2 camshaft cover and replace the camshaft cover gasket.

4.

Reassemble the bank2 camshaft cover.
Tighten: Tighten the camshaft cover bolts to 10♦Y (89♦lb♦in).

Parts Information (2011 Enclave, Malibu, Traverse, Acadia)
Part Number

Description

12647772

Cover, CM/SHF (LH) (LLT)

12647768

Cover, CM/SHF (LH) (LY7)

Warranty Information
For vehicles repaired under warranty, use:
Labor Operation

Description

Labor Time

J0311

Camshaft Cover Replacement

Use Published Labor
Operation Time

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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