PIP-4158F

SB-10052311-5425
File in Section:
Service Bulletin
-
Bulletin No.:
PIP4158F
Date:
May, 2013
PRELIMINARY INFORMATION
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This PI was superseded to add Camaro to the model list. Please discard PIP4158E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some customers may comment on a concern of engine 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.
For vehicles repaired under warranty, please use the appropriate warranty labor operation based on the actual
cause and repair.
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.