| Subject: | Revised DTC P2563 | 
| Models: | 2004-2005 Chevrolet Silverado, Kodiak | 
 | 2004-2005 GMC Sierra, TopKick | 
 | with 6.6L Diesel Engine (VIN 2 - RPO LLY) | 
 
This bulletin is being issued to revise Step 5 of DTC P2563 in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Step 5 should read as follows -- Raise the engine RPM to 1,200 and maintain.