TSB: BUICK 9-7X, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, BRAVADA, ENVOY, ENVOY 360, ESCALADE, RAINIER, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA CLASSIC, SILVERADO, SUBURBAN, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAILBLAZER, TRAILBLAZER 360, YUKON (2003-2007)

Bulletin 05-04-21-003 - January 1, 2008

Bulletin Details

Bulletin ID05-04-21-003
ManufacturerBUICK
Models9-7X, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, BRAVADA, ENVOY, ENVOY 360, ESCALADE, RAINIER, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA CLASSIC, SILVERADO, SUBURBAN, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAILBLAZER, TRAILBLAZER 360, YUKON
Model Years2003-2007
Date IssuedJanuary 1, 2008
Date Added to NHTSANovember 8, 2005
ComponentPOWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
Vehicles Affected58 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

SERVICE 4WD LIGHT ILLUMINATED, DIAGNOSTIC TROUBLE CODE (DTC) C0374 SET. *TT UPDATED 10/05/07. *NJ INSPECT WIRING HARNESS TO TRANSFER CASE SPEED SENSORS, REPLACE WIRING HARNESS. UPDATED 7/18/08 *PE

Affected Vehicles

MakeModelYearComponent
SAAB 9-7X 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 1500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 2500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC ENVOY 360 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 1500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 2500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 3500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA CLASSIC 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SILVERADO 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 1500 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TAHOE 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TRAILBLAZER 360 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC YUKON 2007 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
SAAB 9-7X 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 1500 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 2500 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC ENVOY 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CADILLAC ESCALADE 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
BUICK RAINIER 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SILVERADO 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 1500 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 2500 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TAHOE 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TRAILBLAZER 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC YUKON 2006 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
SAAB 9-7X 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC ENVOY 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CADILLAC ESCALADE 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
BUICK RAINIER 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SILVERADO 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TAHOE 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TRAILBLAZER 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC YUKON 2005 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
OLDSMOBILE BRAVADA 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC ENVOY 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CADILLAC ESCALADE 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
BUICK RAINIER 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SILVERADO 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TAHOE 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TRAILBLAZER 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC YUKON 2004 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET AVALANCHE 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
OLDSMOBILE BRAVADA 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC ENVOY 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CADILLAC ESCALADE 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC SIERRA 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SILVERADO 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET SUBURBAN 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TAHOE 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
CHEVROLET TRAILBLAZER 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
GMC YUKON 2003 104000 POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)

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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 (05-04-21-003) 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.

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.