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TSB: BUICK AVALANCHE 1500, AVALANCHE 2500, BRAVADA, ENVOY, ENVOY XL, ESCALADE, ESCALADE ESV, ESCALADE EXT 1500, H2, RAINIER, SIERRA 1500, SIERRA 1500 HD, SIERRA 2500, SIERRA 2500 HD, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAILBLAZER, TRAILBLAZER EXT, YUKON, YUKON XL, YUKON XL 1500, YUKON XL 2500 (2002–2007)

Bulletin RFI20201207_599- — December 7, 2020

Bulletin Details

Bulletin IDRFI20201207_599-
ManufacturerBUICK
ModelsAVALANCHE 1500, AVALANCHE 2500, BRAVADA, ENVOY, ENVOY XL, ESCALADE, ESCALADE ESV, ESCALADE EXT 1500, H2, RAINIER, SIERRA 1500, SIERRA 1500 HD, SIERRA 2500, SIERRA 2500 HD, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAILBLAZER, TRAILBLAZER EXT, YUKON, YUKON XL, YUKON XL 1500, YUKON XL 2500
Model Years2002–2007
Date IssuedDecember 7, 2020
Date Added to NHTSAMarch 15, 2021
ComponentELECTRICAL SYSTEM
Vehicles Affected103 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

Summary

This SKU is a Climate Control Module. The customer communication requested return of unsold inventory to inspect for a software issue. If the software issue exists it can cause a fan in the climate control system to stay on even when the

Affected Vehicles

MakeModelYearComponent
CHEVROLET AVALANCHE 1500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 2500 2007 110000 ELECTRICAL SYSTEM
GMC ENVOY 2007 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE 2007 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE ESV 2007 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE EXT 1500 2007 110000 ELECTRICAL SYSTEM
HUMMER H2 2007 110000 ELECTRICAL SYSTEM
BUICK RAINIER 2007 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2007 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2007 110000 ELECTRICAL SYSTEM
GMC SIERRA 3500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 3500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 1500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET TAHOE 2007 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER 2007 110000 ELECTRICAL SYSTEM
GMC YUKON 2007 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2007 110000 ELECTRICAL SYSTEM
GMC YUKON XL 1500 2007 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2500 2007 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 1500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 2500 2006 110000 ELECTRICAL SYSTEM
GMC ENVOY 2006 110000 ELECTRICAL SYSTEM
GMC ENVOY XL 2006 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE 2006 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE ESV 2006 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE EXT 1500 2006 110000 ELECTRICAL SYSTEM
HUMMER H2 2006 110000 ELECTRICAL SYSTEM
BUICK RAINIER 2006 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2006 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2006 110000 ELECTRICAL SYSTEM
GMC SIERRA 3500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 3500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 1500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 2500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET TAHOE 2006 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER 2006 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER EXT 2006 110000 ELECTRICAL SYSTEM
GMC YUKON 2006 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2006 110000 ELECTRICAL SYSTEM
GMC YUKON XL 1500 2006 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2500 2006 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 1500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 2500 2005 110000 ELECTRICAL SYSTEM
GMC ENVOY 2005 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE 2005 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE ESV 2005 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE EXT 1500 2005 110000 ELECTRICAL SYSTEM
HUMMER H2 2005 110000 ELECTRICAL SYSTEM
BUICK RAINIER 2005 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2005 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 HD 2005 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2005 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 HD 2005 110000 ELECTRICAL SYSTEM
GMC SIERRA 3500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 3500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 1500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 2500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET TAHOE 2005 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER 2005 110000 ELECTRICAL SYSTEM
GMC YUKON 2005 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2005 110000 ELECTRICAL SYSTEM
GMC YUKON XL 1500 2005 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2500 2005 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 1500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET AVALANCHE 2500 2004 110000 ELECTRICAL SYSTEM
OLDSMOBILE BRAVADA 2004 110000 ELECTRICAL SYSTEM
GMC ENVOY 2004 110000 ELECTRICAL SYSTEM
GMC ENVOY XL 2004 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE 2004 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE ESV 2004 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE EXT 1500 2004 110000 ELECTRICAL SYSTEM
HUMMER H2 2004 110000 ELECTRICAL SYSTEM
BUICK RAINIER 2004 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2004 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 HD 2004 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2004 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 HD 2004 110000 ELECTRICAL SYSTEM
GMC SIERRA 3500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 3500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 1500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 2500 2004 110000 ELECTRICAL SYSTEM
CHEVROLET TAHOE 2004 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER 2004 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER EXT 2004 110000 ELECTRICAL SYSTEM
GMC YUKON 2004 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2004 110000 ELECTRICAL SYSTEM
GMC YUKON XL 1500 2004 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2500 2004 110000 ELECTRICAL SYSTEM
OLDSMOBILE BRAVADA 2003 110000 ELECTRICAL SYSTEM
GMC ENVOY 2003 110000 ELECTRICAL SYSTEM
GMC ENVOY XL 2003 110000 ELECTRICAL SYSTEM
HUMMER H2 2003 110000 ELECTRICAL SYSTEM
GMC ENVOY 2002 110000 ELECTRICAL SYSTEM
GMC ENVOY XL 2002 110000 ELECTRICAL SYSTEM
HUMMER H2 2002 110000 ELECTRICAL SYSTEM

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What Should You Do?

If your vehicle is affected by this TSB, contact your authorized BUICK dealer. Bring this bulletin ID (RFI20201207_599-) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

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Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.

Back to All TSBs