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TSB: BUICK ACADIA, BLAZER, CRUZE, CT6, ENCLAVE, EQUINOX, LACROSSE, MALIBU, REGAL, SIERRA 1500, SILVERADO 1500, TERRAIN, TRAVERSE, XT4, XT5, XT6 (2017–2021)

Bulletin 21NA139 — June 21, 2021

Bulletin Details

Bulletin ID21NA139
ManufacturerBUICK
ModelsACADIA, BLAZER, CRUZE, CT6, ENCLAVE, EQUINOX, LACROSSE, MALIBU, REGAL, SIERRA 1500, SILVERADO 1500, TERRAIN, TRAVERSE, XT4, XT5, XT6
Model Years2017–2021
Date IssuedJune 21, 2021
Date Added to NHTSAAugust 9, 2021
ComponentENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
Vehicles Affected114 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 service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.

Affected Vehicles

MakeModelYearComponent
GMC ACADIA 2021 110000 ELECTRICAL SYSTEM
GMC ACADIA 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET BLAZER 2021 110000 ELECTRICAL SYSTEM
CHEVROLET BLAZER 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK ENCLAVE 2021 110000 ELECTRICAL SYSTEM
BUICK ENCLAVE 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET EQUINOX 2021 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET MALIBU 2021 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC SIERRA 1500 2021 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET SILVERADO 1500 2021 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC TERRAIN 2021 110000 ELECTRICAL SYSTEM
GMC TERRAIN 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET TRAVERSE 2021 110000 ELECTRICAL SYSTEM
CHEVROLET TRAVERSE 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT4 2021 110000 ELECTRICAL SYSTEM
CADILLAC XT4 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT5 2021 110000 ELECTRICAL SYSTEM
CADILLAC XT5 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT6 2021 110000 ELECTRICAL SYSTEM
CADILLAC XT6 2021 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC ACADIA 2020 110000 ELECTRICAL SYSTEM
GMC ACADIA 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET BLAZER 2020 110000 ELECTRICAL SYSTEM
CHEVROLET BLAZER 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK ENCLAVE 2020 110000 ELECTRICAL SYSTEM
BUICK ENCLAVE 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET EQUINOX 2020 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK LACROSSE 2020 110000 ELECTRICAL SYSTEM
BUICK LACROSSE 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET MALIBU 2020 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK REGAL 2020 110000 ELECTRICAL SYSTEM
BUICK REGAL 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC SIERRA 1500 2020 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET SILVERADO 1500 2020 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC TERRAIN 2020 110000 ELECTRICAL SYSTEM
GMC TERRAIN 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET TRAVERSE 2020 110000 ELECTRICAL SYSTEM
CHEVROLET TRAVERSE 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT4 2020 110000 ELECTRICAL SYSTEM
CADILLAC XT4 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT5 2020 110000 ELECTRICAL SYSTEM
CADILLAC XT5 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT6 2020 110000 ELECTRICAL SYSTEM
CADILLAC XT6 2020 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC ACADIA 2019 110000 ELECTRICAL SYSTEM
GMC ACADIA 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET BLAZER 2019 110000 ELECTRICAL SYSTEM
CHEVROLET BLAZER 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET CRUZE 2019 110000 ELECTRICAL SYSTEM
CHEVROLET CRUZE 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC CT6 2019 110000 ELECTRICAL SYSTEM
CADILLAC CT6 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK ENCLAVE 2019 110000 ELECTRICAL SYSTEM
BUICK ENCLAVE 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET EQUINOX 2019 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK LACROSSE 2019 110000 ELECTRICAL SYSTEM
BUICK LACROSSE 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET MALIBU 2019 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK REGAL 2019 110000 ELECTRICAL SYSTEM
BUICK REGAL 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC SIERRA 1500 2019 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET SILVERADO 1500 2019 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC TERRAIN 2019 110000 ELECTRICAL SYSTEM
GMC TERRAIN 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET TRAVERSE 2019 110000 ELECTRICAL SYSTEM
CHEVROLET TRAVERSE 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT4 2019 110000 ELECTRICAL SYSTEM
CADILLAC XT4 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT5 2019 110000 ELECTRICAL SYSTEM
CADILLAC XT5 2019 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC ACADIA 2018 110000 ELECTRICAL SYSTEM
GMC ACADIA 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET CRUZE 2018 110000 ELECTRICAL SYSTEM
CHEVROLET CRUZE 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC CT6 2018 110000 ELECTRICAL SYSTEM
CADILLAC CT6 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK ENCLAVE 2018 110000 ELECTRICAL SYSTEM
BUICK ENCLAVE 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET EQUINOX 2018 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK LACROSSE 2018 110000 ELECTRICAL SYSTEM
BUICK LACROSSE 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET MALIBU 2018 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK REGAL 2018 110000 ELECTRICAL SYSTEM
BUICK REGAL 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
GMC TERRAIN 2018 110000 ELECTRICAL SYSTEM
GMC TERRAIN 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET TRAVERSE 2018 110000 ELECTRICAL SYSTEM
CHEVROLET TRAVERSE 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC XT5 2018 110000 ELECTRICAL SYSTEM
CADILLAC XT5 2018 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET CRUZE 2017 110000 ELECTRICAL SYSTEM
CHEVROLET CRUZE 2017 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CADILLAC CT6 2017 110000 ELECTRICAL SYSTEM
CADILLAC CT6 2017 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK ENCLAVE 2017 110000 ELECTRICAL SYSTEM
BUICK ENCLAVE 2017 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
BUICK LACROSSE 2017 110000 ELECTRICAL SYSTEM
BUICK LACROSSE 2017 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
CHEVROLET MALIBU 2017 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2017 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

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 (21NA139) 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