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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Technical Service Bulletin # 01-06-01-028B Date: 111003

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Technical Service Bulletin # 01-06-01-028B Date: 111003



Engine - Knocking on Cold Start Explanation



INFORMATION



Bulletin No.: 01-06-01-028B



Date: October 03, 2011



Subject: Engine Knock on Cold Start



Models:



1999-2002 Chevrolet and GMC C/K Pickup and Utility Models



2002 Cadillac Escalade (2WD)



Equipped with 4.8L, 5.3L or 6.0L Engine (RPOs LR4, LM7, L59, LQ4)



2007-2012 Cadillac Escalade Models



2007-2012 Chevrolet Silverado



2007-2012 GMC Sierra, Yukon Denali, Yukon XL Denali



Equipped with 6.2L Engine (RPOs L92, L94, L9H)



Supercede:



This bulletin is being revised to update the Models section. Please discard Corporate Bulletin Number 01-06-01-028A (Section 06 -



Engine/Propulsion System).



Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock



noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold



temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10掳C (50掳F) and may be more pronounced



on the first cold start following a long trip.



This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain



Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or



durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.



Important



At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.



Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or



concerns, please advise your District Manager Aftersales (U.S.) (in Canada, District Manager - Customer Care and Service Process (DM-CCSP).



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