100601007E
Service Bulletin Details
Public Details for: 100601007E
This technical bulletin provides a procedure to correct a condition of active fuel management (afm) engine valve lifter tick noise at start up when engine has been off for 2 hours or more.
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2007 BUICK RAINIER |
2007 CADILLAC ESCALADE |
2007 CHEVROLET SUBURBAN |
2007 CHEVROLET TAHOE |
2007 CHEVROLET TRAILBLAZER |
2007 GMC ENVOY |
2007 GMC YUKON |
2007 GMC YUKON DENALI |
2007 GMC YUKON XL |
Bulletin No.: Service Bulletin Date: 10-06-01-007E August, 2020 TECHNICAL Subject: Active Fuel Management (AFM) Engine, Valve Lifter Tick Noise at Start Up When Engine Has Been Off for 2 Hours or More (Evaluate Noise and/or Replace AFM Valve Lifters) Models: 2007 Buick Rainier 2009 Buick LaCrosse Super, Allure Super (Canada Only) 2007 Cadillac Escalade Built Prior to April 1, 2006 with 6.2L Engine RPO L92 (These engines were built with AFM Hardware but the AFM system was disabled) 2010-2011 Cadillac Escalade, Escalade ESV, Escalade EXT 2007 Chevrolet Monte Carlo 2007-2009 Chevrolet Impala 2007-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT 2010-2011 Chevrolet Camaro SS 2007-2011 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali 2007-2008 Pontiac Grand Prix 2008-2009 Pontiac G8 2007-2009 Saab 9-7X Equipped with AFM (Active Fuel Management) and V8 Engine RPO L76, L94, L99, LC9, LFA, LH6, LMG, LS4, LY5 or LZ1 Attention: This bulletin only applies to the AFM V8 engines listed above. It DOES NOT apply to non-AFM Engines. If you are dealing with a non-AFM engine that is experiencing a similar noise, refer to Engine Mechanical > Diagnostic Information and Procedures > Symptoms in SI. This bulletin has been revised to update the Part Number and Labor Operation. Please discard Corporate Bulletin Number 10-06-01-007D. Condition Some customers may comment on an engine valve lifter tick noise that occurs after the engine has been shut off for at least two hours. The tick noise may last from two seconds to ten minutes. Cause This condition may be caused by any of the following: • Aerated oil in the valve lifter body, resulting in the valve lifter being unable to purge the air quickly. • A low engine oil level or incorrect oil viscosity. • Dirty or contaminated oil. • A low internal valve lifter oil reservoir level. Copyright 2020 General Motors LLC. All Rights Reserved. • • Debris in the valve lifter. A high valve lifter leak down rate. Correction If the SI diagnostics do not isolate the cause of this valve lifter tick noise and normal oil pressure is noted during the concern, perform the following steps: 1. Inspect the engine oil condition and level. Refer to Owner Manual > Service and Appearance Care > Checking Things Under the Hood > Description and Operation > Engine Oil in SI. ⇒ If the engine oil is more than one quart low, an incorrect oil viscosity is being used or if poor quality/contamination is observed, change the oil and filter. Page 2 August, 2020 Bulletin No.: 10-06-01-007E Notice: Allow at least a two hour soak time between engine OFF and start up when evaluating the valve lifter tick noise. 2. Start the engine and evaluate the valve lifter tick noise. ⇒ If the valve lifter tick noise is still present, replace all 8 active fuel management (AFM) valve lifters ONLY. Refer to Valve Lifter Replacement (With AFM) in SI. Parts Information Part Number Description Qty 12680871 AFM Hydraulic Valve Lifter 8 Warranty Information (excluding Saab Models) For vehicles repaired under warranty, use: Labor Operation 4062391 Description Valve Lifter Replacement - Both Sides Labor Time Use Published Labor Operation Time Warranty Information (Saab Models) For vehicles repaired under warranty, use: Saab Labor Operation 21421-12 Description Replace part, Depressor Failed Object 21421 Fault/ Reason Code 40 Location Code Warranty Type 5 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. 1 Repair/ Action Code STM Labor Time 01 (Replace) Use Published STM Labor Operation Time WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION