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TSB: BUICK ATS, CORVETTE, CT6, CTS, ENVISION, ESCALADE, ESCALADE ESV, MALIBU, SUBURBAN, TAHOE, VOLT, XTS, YUKON, YUKON XL (2016–2018)

Bulletin 18NA087 — March 16, 2018

Bulletin Details

Bulletin ID18NA087
ManufacturerBUICK
ModelsATS, CORVETTE, CT6, CTS, ENVISION, ESCALADE, ESCALADE ESV, MALIBU, SUBURBAN, TAHOE, VOLT, XTS, YUKON, YUKON XL
Model Years2016–2018
Date IssuedMarch 16, 2018
Date Added to NHTSAMay 21, 2018
ComponentELECTRICAL SYSTEM:HORN
Vehicles Affected70 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 informational bulletin provides information on Phantom Three Beeps or Horn Chirps Heard After Turning Off Vehicle and that it should be considered normal.

Affected Vehicles

MakeModelYearComponent
CADILLAC ATS 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ATS 2018 353000 EQUIPMENT:ELECTRICAL
CADILLAC CT6 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CT6 2018 353000 EQUIPMENT:ELECTRICAL
CADILLAC CTS 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CTS 2018 353000 EQUIPMENT:ELECTRICAL
BUICK ENVISION 2018 110100 ELECTRICAL SYSTEM:HORN
BUICK ENVISION 2018 353000 EQUIPMENT:ELECTRICAL
CADILLAC ESCALADE 2018 353000 EQUIPMENT:ELECTRICAL
CADILLAC ESCALADE 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE ESV 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE ESV 2018 353000 EQUIPMENT:ELECTRICAL
CHEVROLET SUBURBAN 2018 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET SUBURBAN 2018 353000 EQUIPMENT:ELECTRICAL
CHEVROLET TAHOE 2018 353000 EQUIPMENT:ELECTRICAL
CHEVROLET TAHOE 2018 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET VOLT 2018 353000 EQUIPMENT:ELECTRICAL
CHEVROLET VOLT 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC XTS 2018 353000 EQUIPMENT:ELECTRICAL
CADILLAC XTS 2018 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ATS 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC ATS 2017 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET CORVETTE 2017 353000 EQUIPMENT:ELECTRICAL
CHEVROLET CORVETTE 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CT6 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC CT6 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CTS 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC CTS 2017 110100 ELECTRICAL SYSTEM:HORN
BUICK ENVISION 2017 353000 EQUIPMENT:ELECTRICAL
BUICK ENVISION 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC ESCALADE ESV 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE ESV 2017 353000 EQUIPMENT:ELECTRICAL
CHEVROLET SUBURBAN 2017 353000 EQUIPMENT:ELECTRICAL
CHEVROLET SUBURBAN 2017 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET TAHOE 2017 353000 EQUIPMENT:ELECTRICAL
CHEVROLET TAHOE 2017 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET VOLT 2017 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET VOLT 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC XTS 2017 110100 ELECTRICAL SYSTEM:HORN
CADILLAC XTS 2017 353000 EQUIPMENT:ELECTRICAL
CADILLAC ATS 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC ATS 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET CORVETTE 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET CORVETTE 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC CT6 2016 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CT6 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC CTS 2016 110100 ELECTRICAL SYSTEM:HORN
CADILLAC CTS 2016 353000 EQUIPMENT:ELECTRICAL
BUICK ENVISION 2016 353000 EQUIPMENT:ELECTRICAL
BUICK ENVISION 2016 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE 2016 110100 ELECTRICAL SYSTEM:HORN
CADILLAC ESCALADE 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC ESCALADE ESV 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC ESCALADE ESV 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET MALIBU 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET MALIBU 2016 353000 EQUIPMENT:ELECTRICAL
CHEVROLET SUBURBAN 2016 353000 EQUIPMENT:ELECTRICAL
CHEVROLET SUBURBAN 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET TAHOE 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET TAHOE 2016 353000 EQUIPMENT:ELECTRICAL
CHEVROLET VOLT 2016 110100 ELECTRICAL SYSTEM:HORN
CHEVROLET VOLT 2016 353000 EQUIPMENT:ELECTRICAL
CADILLAC XTS 2016 110100 ELECTRICAL SYSTEM:HORN
CADILLAC XTS 2016 353000 EQUIPMENT:ELECTRICAL
GMC YUKON 2016 353000 EQUIPMENT:ELECTRICAL
GMC YUKON 2016 110100 ELECTRICAL SYSTEM:HORN
GMC YUKON XL 2016 353000 EQUIPMENT:ELECTRICAL
GMC YUKON XL 2016 110100 ELECTRICAL SYSTEM:HORN

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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 (18NA087) 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