K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Piston: Technical Service Bulletins
Engine - Information on Knock During Cold Start
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-01-022
Date: September, 2001
INFORMATION
Subject:
Information on Engine Knock on Cold Start
Models:
2001-2002 Chevrolet and GMC C/K Pickup and Utility Models
with 6.0L Engine (VIN U - RPO L04)
Some of the above vehicles may exhibit an engine knock noise that begins in the first several thousand miles/kilometers of use. The knock noise is most
often noticed during initial start-up and typically disappears as the engine warms up. The noise is usually more noticeable on the initial start-up when the
temperature is below 10°C (50°F) or if the vehicle has not been used for several days.
This noise may be caused by an interaction between the piston and the cylinder wall. GM Powertrain Engineering, and an analysis of engines returned
with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. The noise does not have any
effect on the longevity of any of the engine components.
Important:
At this time, replacing the engine assembly or pistons will not eliminate this noise.
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 them to contact Customer Assistance at the numbers listed for further information.
Disclaimer
