NHTSA ID Number: 10253628
Manufacturer Communication Number: PI0746C
TSB/Document Date: 2024-04-29
Summary
Malfunction Indicator Lamp.
File in Section:
Service Bulletin
Bulletin No.:
Date:
PI0746C
March, 2013
PRELIMINARY INFORMATION
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 update the Parts Information and Warranty Information. Please
discard PI0746B.
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.
2837688
Technicians may find DTC s 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.
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, Acadia, G6, OUTLOOK)
Part Number
Description
12616913
Tube, PCV (Enclave, Traverse, Acadia,
OUTLOOK)
12616914
Tube, PCV (Malibu, G6)
12647768
Cover, CM/SHF (LH) (LY7)
12641261
Seal, CM/SHR CVR (RH) (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 (Enclave, Acadia,
OUTLOOK)
3.2 hrs
Positive Crankcase Ventilation Tube/Covers/Seal (Malibu, G6)
2.3 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)
Part Number
Description
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 (Enclave, Acadia,
Traverse, OUTLOOK)
3.9 hrs
Positive Crankcase Ventilation Tube/Covers/Seal (Malibu, G6)
2.3 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
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TSB/Document ID: PI0746C
Replacement Service Bulletin Number:
MFR Communication Date: 2013-03-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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