06-06-05-001F
Service Bulletin Details
Public Details for: 06-06-05-001F
This informational bulletin explains a normal condition from changes in exhaust tone for active fuel management engines when in three or four cylinder mode
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File in Section: Bulletin No.: Service Bulletin Date: 06 - Engine 06-06-05-001F May, 2014 INFORMATION Subject: Information on Changes in Exhaust Tone for Active Fuel Management Engines When in Three or Four Cylinder Mode Models: 2007 Buick Rainier 2007-2009 Buick Allure (Canada Only), LaCrosse 2007 Chevrolet Monte Carlo 2007-2009 Chevrolet TrailBlazer 2007-2012 Chevrolet Avalanche, Impala, Silverado, Suburban, Tahoe 2010-2014 Chevrolet Camaro 2013 Chevrolet Silverado 2013-2014 Chevrolet, Suburban, Tahoe 2007-2009 GMC Envoy Denali 2007-2012 GMC Sierra, Yukon, Yukon XL, Yukon Denali 2013 GMC Sierra 2013-2014 GMC Yukon, Yukon XL and Denali 2007-2009 Saab 9-7X Equipped with Active Fuel Management Vortec™ GEN IV 5.3L, 6.0L or 6.2L V8 Engine — RPO LMG, LC9, LY5, LH6, L76, L77, LFA, LZ1, LS4, L94 or L99 Equipped with Active Fuel Management 3.9L V6 Engine — RPO LZ8 or LZG This bulletin has been revised to update the Subject and add certain Model Year 2013-2014 vehicles. Please discard Corporate Bulletin Number 06-06-05-001E. Changes in Exhaust Tone Some customers may comment on changes in the exhaust tone when an Active Fuel Management (AFM) equipped 6 cylinder or 8 cylinder engine changes to 3 cylinder or 4 cylinder mode. Some drivers may also notice a very slight vibration in either the accelerator pedal, floor pan and/or the steering wheel. This is a normal condition for AFM equipped vehicles and no repairs should be attempted. Tip: For full size trucks, verify the vibration by test driving the vehicle at approximately 30 mph (48 km/h). Use the DIC to monitor the AFM V8 to V4 cylinder activation. Confirm the vibration is present during V4 mode. Place the transmission in manual mode 5th gear to force the engine to stay in V8 mode. Again operate the vehicle at same speed and confirm no vibration is present in V8 mode. Customer Information on Active Fuel Management When Active Fuel Management is enabled, physical changes take place within the engine that allow it to run as a 3 cylinder or 4 cylinder with accompanying additional fuel savings. The change in exhaust tone is expected, as all sound from the exhaust is the result of combustion in the engine. The ability to perceive these changes in sound are kept to very minimal levels as AFM is only activated during steady state or near steady state driving conditions or during a coast down. In both of these situations, the load on the engine is minimal and general exhaust volume (sound) will be less. Please provide a copy of this bulletin to your customer. Vortec™ is a Trademark of General Motors LLC 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. Copyright 2014 General Motors LLC. All Rights Reserved. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION