Engine Controls - Revised DTC P1221

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 02-06-04-005

Date: February, 2002

SERVICE MANUAL UPDATE

Subject:
Revised DTC P1221

Models:

2001-2002 Chevrolet Corvette
2001 Chevrolet and GMC C/K Pickup and Utility Models
(Silverado, Sierra, Sierra C3, Suburban, Tahoe, Yukon, Yukon XL)
2001 Chevrolet and GMC G-Van Models (Express, Savana)
2001-2002 Chevrolet and GMC 3500 HD Models
2001-2002 Chevrolet and GMC C-Series Medium Duty Conventional Cab

Models

2001-2002 Chevrolet and GMC B7 Medium Duty School Bus Models
With 4.8L, 5.3L, 5.7L, 6.0L or 8.1 L Engine
(VINs V, T, G, S, U, G - RPOs LR4, LM7, LS1, L56, L04, L18)

This bulletin is being issued to revise step 2 of DTC P1221 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 S12000. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.





The text "DTC P1515" has been deleted in step 2. Step 2 of this diagnostic table should read as shown.





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