2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 01-06-01-028B Date: 111003

2010 Cadillac Truck Escalade EXT AWD 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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