TSB: CADILLAC AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, CAMARO, ESCALADE, ESCALADE ESV, ESCALADE EXT, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAVERSE, YUKON (2007–2011)

Bulletin PIT-4056 — February 1, 2012

Bulletin Details

Bulletin IDPIT-4056
ManufacturerCADILLAC
ModelsAVALANCHE, AVALANCHE 1500, AVALANCHE 2500, CAMARO, ESCALADE, ESCALADE ESV, ESCALADE EXT, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, SUBURBAN 1500, SUBURBAN 2500, TAHOE, TRAVERSE, YUKON
Model Years2007–2011
Date IssuedFebruary 1, 2012
Date Added to NHTSASeptember 20, 2007
ComponentSERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
Vehicles Affected84 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

GMC: UNABLE TO COMMUNICATE WITH THE EBCM DTC U0121. *NJ VEHICLES EQUIPPED WITH JL4. UPDATED 9/30/08. *PE UPDATED 6/27/11. *PE UPDATED 4/6/12. *PE

Affected Vehicles

MakeModelYearComponent
CHEVROLET AVALANCHE 1500 2011 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 1500 2011 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET CAMARO 2011 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET CAMARO 2011 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2011 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2011 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET CAMARO 2010 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET CAMARO 2010 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2010 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2010 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CADILLAC ESCALADE ESV 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE ESV 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CADILLAC ESCALADE EXT 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE EXT 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2009 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TRAVERSE 2009 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 1500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 1500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CADILLAC ESCALADE ESV 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CADILLAC ESCALADE ESV 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE EXT 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CADILLAC ESCALADE EXT 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 1500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 1500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 2500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 2500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 3500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 3500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 1500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 1500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 3500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 3500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 1500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 1500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 2500 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 2500 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC YUKON 2008 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC YUKON 2008 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 1500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 1500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET AVALANCHE 2500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CADILLAC ESCALADE 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 1500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 1500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 2500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 2500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC SIERRA 3500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
GMC SIERRA 3500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 1500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 1500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 2500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 3500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SILVERADO 3500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 1500 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
CHEVROLET SUBURBAN 1500 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
CHEVROLET TAHOE 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC YUKON 2007 036100 SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
GMC YUKON 2007 046100 SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

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What Should You Do?

If your vehicle is affected by this TSB, contact your authorized CADILLAC dealer. Bring this bulletin ID (PIT-4056) 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.