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TSB: BUICK CAMARO, ENCLAVE, ENVISION, ESCALADE, ESCALADE ESV, SIERRA 1500, SILVERADO 1500, TAHOE, YUKON, YUKON XL (2017–2019)

Bulletin 18NA026 — April 17, 2018

Bulletin Details

Bulletin ID18NA026
ManufacturerBUICK
ModelsCAMARO, ENCLAVE, ENVISION, ESCALADE, ESCALADE ESV, SIERRA 1500, SILVERADO 1500, TAHOE, YUKON, YUKON XL
Model Years2017–2019
Date IssuedApril 17, 2018
Date Added to NHTSAMarch 2, 2020
ComponentENGINE AND ENGINE COOLING
Vehicles Affected45 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 technical bulletin provides a procedure to install an oil cooler line fitting seal, including applying medium strength threadlocker (blue) to the retaining bolt to stop transmission fluid leaking from the transmission oil cooler line r

Affected Vehicles

MakeModelYearComponent
GMC SIERRA 1500 2019 356000 EQUIPMENT ADAPTIVE/MOBILITY
GMC SIERRA 1500 2019 070000 FUEL SYSTEM, GASOLINE
GMC SIERRA 1500 2019 100000 POWER TRAIN
CHEVROLET SILVERADO 1500 2019 356000 EQUIPMENT ADAPTIVE/MOBILITY
CHEVROLET SILVERADO 1500 2019 100000 POWER TRAIN
CHEVROLET SILVERADO 1500 2019 070000 FUEL SYSTEM, GASOLINE
CHEVROLET CAMARO 2018 060000 ENGINE AND ENGINE COOLING
CHEVROLET CAMARO 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
CHEVROLET CAMARO 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
CHEVROLET CAMARO 2018 100000 POWER TRAIN
CHEVROLET CAMARO 2018 070000 FUEL SYSTEM, GASOLINE
BUICK ENCLAVE 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
BUICK ENCLAVE 2018 060000 ENGINE AND ENGINE COOLING
BUICK ENVISION 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
BUICK ENVISION 2018 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE 2018 070000 FUEL SYSTEM, GASOLINE
CADILLAC ESCALADE 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
CADILLAC ESCALADE 2018 100000 POWER TRAIN
CADILLAC ESCALADE 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
CADILLAC ESCALADE 2018 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE ESV 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
CADILLAC ESCALADE ESV 2018 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE ESV 2018 070000 FUEL SYSTEM, GASOLINE
CADILLAC ESCALADE ESV 2018 100000 POWER TRAIN
CADILLAC ESCALADE ESV 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
CHEVROLET TAHOE 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
CHEVROLET TAHOE 2018 100000 POWER TRAIN
CHEVROLET TAHOE 2018 070000 FUEL SYSTEM, GASOLINE
CHEVROLET TAHOE 2018 060000 ENGINE AND ENGINE COOLING
CHEVROLET TAHOE 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
GMC YUKON 2018 070000 FUEL SYSTEM, GASOLINE
GMC YUKON 2018 100000 POWER TRAIN
GMC YUKON 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
GMC YUKON 2018 060000 ENGINE AND ENGINE COOLING
GMC YUKON 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
GMC YUKON XL 2018 100000 POWER TRAIN
GMC YUKON XL 2018 356000 EQUIPMENT ADAPTIVE/MOBILITY
GMC YUKON XL 2018 070000 FUEL SYSTEM, GASOLINE
GMC YUKON XL 2018 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES
GMC YUKON XL 2018 060000 ENGINE AND ENGINE COOLING
CHEVROLET CAMARO 2017 356000 EQUIPMENT ADAPTIVE/MOBILITY
CHEVROLET CAMARO 2017 100000 POWER TRAIN
CHEVROLET CAMARO 2017 070000 FUEL SYSTEM, GASOLINE
CHEVROLET CAMARO 2017 060000 ENGINE AND ENGINE COOLING
CHEVROLET CAMARO 2017 103600 POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES

Related BUICK Recalls

CampaignModelYearComponentSummary
REGAL 2013 SUSPENSION:REAR General Motors, LLC (GM) is recalling certain 2012–2013 Buick Regal Turbo and...
REGAL 2012 SUSPENSION:REAR General Motors, LLC (GM) is recalling certain 2012–2013 Buick Regal Turbo and...
ENCLAVE 2026 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER ... General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cad...
ENVISION 2026 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER ... General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cad...
VERANO 2014 AIR BAGS:SIDE/WINDOW General Motors, LLC (GM) is recalling certain 2014 Buick Verano and Chevrolet...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized BUICK dealer. Bring this bulletin ID (18NA026) 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