| Subject: | Revised DTC P1172 | 
| Models: | 2002-2004 Chevrolet Silverado | 
| 2003-2004 Chevrolet Kodiak | 
| 2002-2004 GMC Sierra | 
| 2003-2004 GMC TopKick | 
| with 6.6L Diesel Engine (VIN 1 - RPO LB7) | 
This bulletin is being issued to revise Step 18 of DTC P1172 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  | Action  | Values  | Yes  | No  | ||||
|---|---|---|---|---|---|---|---|---|
18  | Inspect for the following conditions: 
 
 Did you find and correct the condition?  | --  | Go to Step 28  | Go to Step 26  |