PIP4786C
Service Bulletin Details
Public Details for: PIP4786C
This preliminary information communication provides information to the technician about vehicles that may have low oil pressure message. Technician may also find a diagnostic trouble code P0521 in the engine control module. Technician shoul
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Bulletin No.: PIP4786C Date: Aug-2016 Subject: Low Oil Pressure Message/Light - Inspect Valve Lifter Oil Filter Models: 2007 Cadillac Escalade Built before April 1, 2006 with 6.2L L92 Engine (These engines were built with AFM Hardware but the AFM system was disabled) 2009 Buick Lacrosse Super, Allure Super (Canada Only) 2005-2007 Buick Rainier 2007-2016 Cadillac Escalade 2010-2016 Chevrolet Camaro SS 2014-2016 Chevrolet Corvette 2007-2016 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2007-2009 Chevrolet Impala 2005-2009 Chevrolet Trailblazer 2007 Chevrolet Monte Carlo 2007-2016 GMC Sierra, Yukon 2005-2009 GMC Envoy 2007-2008 Pontiac Grand Prix 2008-2009 Pontiac G8 2005-2009 Saab 97x With an AFM (Active Fuel Management) V8 Engine RPO: L76, L77, L83, L86 L94, L99, LC9, LFA, LH6, LMG, LS4, LT1, LT4, LY5, LV3 This PI was superseded to update Models. Please discard PIP4786B. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Some customers may complain of a low oil pressure message/light on the dash and a technician may find a P0521 DTC in the ECM. Recommendation/Instructions If this concern is encountered, follow SI diagnosis. If it indicates that the Tech 2 or GDS2 oil pressure parameter is low but proper oil pressure is present at the oil filter housing, inspect the Valve Lifter Oil Filter for debris/sludge that could be restricting oil flow to the oil pressure sensor before replacing any parts. Follow the Valve Lifter Oil Filter Removal and Installation Procedure to remove the filter for inspection. If the filter is plugged, it can normally be cleaned with brake/contact cleaner and light shop air. If it cannot be cleaned for some reason, replace it using the part number listed in the parts catalog. 1 Do not replace the complete Valve Lifter Oil Manifold just because the filter is plugged. Warranty Information For vehicles repaired under warranty use: Labor Operation Description Labor Time 4065750 Valve Lifter Oil Filter Replacement Use Published Labor Operation Time 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION 2