PIP4158G

Bulletin No.: PIP4158G
Date: Jun-2013
Subject:
Low Oil Pump Pressure Due To Sticking Oil Pressure Relief Valve
Models:
2008-2009 Buick Lacrosse, Allure (Canada Only)
2007-2013 Cadillac CTS-V, Escalade
2007-2013 Chevrolet Avalanche, Corvette, Silverado, Suburban, Tahoe
2010-2013 Chevrolet Camaro
2007 Chevrolet Monte Carlo SS
2007-2009 Chevrolet Impala SS, Trail Blazer
2009-2013 Chevrolet Colorado
2007-2013 GMC Envoy, Sierra, Yukon
2009-2013 GMC Canyon
2008-2010 Hummer H2
2008-2010 H3 Alpha
2008 Pontiac Grand Prix GXP
2008-2010 Pontiac G8 GT
2007-2009 Saab 97x
with the Following Aluminum V8 Engine RPOs:
L76, L77, L92, L94, L99, L9H, LC9, LH6, LH8, LH9, LMG, LS2, LS3, LS4, LS7, LS9, LSA, LZ1
This PI was superseded to change the labor time information. Please discard PIP4158F.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some customers may complain of low oil pressure, no oil pressure, and/or engine noise, which may be the result of a sticking oil pump pressure relief valve.
In some instances, this may occur intermittently if the valve frees up when the engine cools down.
Recommendation/Instructions
If SI diagnosis isolates low mechanical oil pressure at the oil filter housing and oil pressure sensor, replace the oil pump, flush the oil cooler lines (if equipped).
Clean the inside of the oil pan, change the oil and filter, and re-evaluate the concern.
Notice: If an engine noise is noticed after replacing the oil pump, follow the SI diagnosis and repair the engine as necessary.
Warranty Information
For vehicles repaired under warranty use:
Labor Operation
Description
1
Labor Time
4066070
Oil Pump Replacement
Use Published Labor Operation Time
Additional SI Keywords:
P0521
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the
remaining steps do not need to be performed.
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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