TSB: BUICK ACADIA, CAMARO, CORVETTE, CT5, ENCORE GX, EQUINOX, ESCALADE, ESCALADE ESV, MALIBU, REGAL, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, YUKON, YUKON XL (2019–2021)

Bulletin 20NA218 — November 17, 2020

Bulletin Details

Bulletin ID20NA218
ManufacturerBUICK
ModelsACADIA, CAMARO, CORVETTE, CT5, ENCORE GX, EQUINOX, ESCALADE, ESCALADE ESV, MALIBU, REGAL, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, YUKON, YUKON XL
Model Years2019–2021
Date IssuedNovember 17, 2020
Date Added to NHTSAJuly 19, 2021
ComponentENGINE (PWS)
Vehicles Affected184 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 repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.

Affected Vehicles

MakeModelYearComponent
GMC ACADIA 2021 100000 POWER TRAIN
GMC ACADIA 2021 060000 ENGINE AND ENGINE COOLING
GMC ACADIA 2021 110000 ELECTRICAL SYSTEM
CHEVROLET CAMARO 2021 100000 POWER TRAIN
CHEVROLET CAMARO 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET CAMARO 2021 110000 ELECTRICAL SYSTEM
BUICK ENCORE GX 2021 100000 POWER TRAIN
BUICK ENCORE GX 2021 060000 ENGINE AND ENGINE COOLING
BUICK ENCORE GX 2021 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2021 100000 POWER TRAIN
CHEVROLET EQUINOX 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET EQUINOX 2021 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
CADILLAC ESCALADE 2021 060000 ENGINE (PWS)
CADILLAC ESCALADE 2021 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE 2021 350000 EQUIPMENT
CADILLAC ESCALADE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE 2021 350000 EQUIPMENT
CADILLAC ESCALADE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE 2021 100000 POWER TRAIN
CADILLAC ESCALADE 2021 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE 2021 110000 ELECTRICAL SYSTEM
CADILLAC ESCALADE ESV 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
CADILLAC ESCALADE ESV 2021 060000 ENGINE (PWS)
CADILLAC ESCALADE ESV 2021 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE ESV 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE ESV 2021 350000 EQUIPMENT
CADILLAC ESCALADE ESV 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE ESV 2021 350000 EQUIPMENT
CADILLAC ESCALADE ESV 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CADILLAC ESCALADE ESV 2021 100000 POWER TRAIN
CADILLAC ESCALADE ESV 2021 060000 ENGINE AND ENGINE COOLING
CADILLAC ESCALADE ESV 2021 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2021 100000 POWER TRAIN
CHEVROLET MALIBU 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET MALIBU 2021 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2021 100000 POWER TRAIN
GMC SIERRA 1500 2021 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 1500 2021 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2021 100000 POWER TRAIN
GMC SIERRA 2500 2021 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 2500 2021 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 1500 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 1500 2021 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 2500 2021 110000 ELECTRICAL SYSTEM
CHEVROLET SUBURBAN 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
CHEVROLET SUBURBAN 2021 060000 ENGINE (PWS)
CHEVROLET SUBURBAN 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET SUBURBAN 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SUBURBAN 2021 350000 EQUIPMENT
CHEVROLET SUBURBAN 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SUBURBAN 2021 350000 EQUIPMENT
CHEVROLET SUBURBAN 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SUBURBAN 2021 100000 POWER TRAIN
CHEVROLET SUBURBAN 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET SUBURBAN 2021 110000 ELECTRICAL SYSTEM
CHEVROLET TAHOE 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
CHEVROLET TAHOE 2021 060000 ENGINE (PWS)
CHEVROLET TAHOE 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET TAHOE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET TAHOE 2021 350000 EQUIPMENT
CHEVROLET TAHOE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET TAHOE 2021 350000 EQUIPMENT
CHEVROLET TAHOE 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET TAHOE 2021 100000 POWER TRAIN
CHEVROLET TAHOE 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET TAHOE 2021 110000 ELECTRICAL SYSTEM
GMC TERRAIN 2021 100000 POWER TRAIN
GMC TERRAIN 2021 060000 ENGINE AND ENGINE COOLING
GMC TERRAIN 2021 110000 ELECTRICAL SYSTEM
CHEVROLET TRAILBLAZER 2021 100000 POWER TRAIN
CHEVROLET TRAILBLAZER 2021 060000 ENGINE AND ENGINE COOLING
CHEVROLET TRAILBLAZER 2021 110000 ELECTRICAL SYSTEM
GMC YUKON 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
GMC YUKON 2021 060000 ENGINE (PWS)
GMC YUKON 2021 060000 ENGINE AND ENGINE COOLING
GMC YUKON 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON 2021 350000 EQUIPMENT
GMC YUKON 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON 2021 350000 EQUIPMENT
GMC YUKON 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON 2021 100000 POWER TRAIN
GMC YUKON 2021 060000 ENGINE AND ENGINE COOLING
GMC YUKON 2021 110000 ELECTRICAL SYSTEM
GMC YUKON XL 2021 118000 ELECTRICAL SYSTEM:SOFTWARE
GMC YUKON XL 2021 060000 ENGINE (PWS)
GMC YUKON XL 2021 060000 ENGINE AND ENGINE COOLING
GMC YUKON XL 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON XL 2021 350000 EQUIPMENT
GMC YUKON XL 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON XL 2021 350000 EQUIPMENT
GMC YUKON XL 2021 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC YUKON XL 2021 100000 POWER TRAIN
GMC YUKON XL 2021 060000 ENGINE AND ENGINE COOLING
GMC YUKON XL 2021 110000 ELECTRICAL SYSTEM
CHEVROLET CORVETTE 2020 350000 EQUIPMENT
CHEVROLET CORVETTE 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET CORVETTE 2020 100000 POWER TRAIN
CHEVROLET CORVETTE 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET CORVETTE 2020 110000 ELECTRICAL SYSTEM
CADILLAC CT5 2020 100000 POWER TRAIN
CADILLAC CT5 2020 060000 ENGINE AND ENGINE COOLING
CADILLAC CT5 2020 110000 ELECTRICAL SYSTEM
BUICK ENCORE GX 2020 100000 POWER TRAIN
BUICK ENCORE GX 2020 060000 ENGINE AND ENGINE COOLING
BUICK ENCORE GX 2020 110000 ELECTRICAL SYSTEM
CHEVROLET EQUINOX 2020 100000 POWER TRAIN
CHEVROLET EQUINOX 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET EQUINOX 2020 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2020 100000 POWER TRAIN
CHEVROLET MALIBU 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET MALIBU 2020 110000 ELECTRICAL SYSTEM
BUICK REGAL 2020 100000 POWER TRAIN
BUICK REGAL 2020 060000 ENGINE AND ENGINE COOLING
BUICK REGAL 2020 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2020 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 1500 2020 350000 EQUIPMENT
GMC SIERRA 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 1500 2020 350000 EQUIPMENT
GMC SIERRA 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 1500 2020 100000 POWER TRAIN
GMC SIERRA 1500 2020 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 1500 2020 110000 ELECTRICAL SYSTEM
GMC SIERRA 2500 2020 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 2500 2020 350000 EQUIPMENT
GMC SIERRA 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 2500 2020 350000 EQUIPMENT
GMC SIERRA 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 2500 2020 100000 POWER TRAIN
GMC SIERRA 2500 2020 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 2500 2020 110000 ELECTRICAL SYSTEM
GMC SIERRA 3500 2020 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 3500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 3500 2020 350000 EQUIPMENT
GMC SIERRA 3500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 1500 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 1500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 1500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 1500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 1500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 1500 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 1500 2020 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 2500 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 2500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 2500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 2500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 2500 2020 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 3500 2020 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 3500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 3500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 3500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2020 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC TERRAIN 2020 100000 POWER TRAIN
GMC TERRAIN 2020 060000 ENGINE AND ENGINE COOLING
GMC TERRAIN 2020 110000 ELECTRICAL SYSTEM
CHEVROLET MALIBU 2019 100000 POWER TRAIN
CHEVROLET MALIBU 2019 060000 ENGINE AND ENGINE COOLING
CHEVROLET MALIBU 2019 110000 ELECTRICAL SYSTEM
BUICK REGAL 2019 100000 POWER TRAIN
BUICK REGAL 2019 060000 ENGINE AND ENGINE COOLING
BUICK REGAL 2019 110000 ELECTRICAL SYSTEM
GMC SIERRA 1500 2019 350000 EQUIPMENT
GMC SIERRA 1500 2019 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
GMC SIERRA 1500 2019 100000 POWER TRAIN
GMC SIERRA 1500 2019 060000 ENGINE AND ENGINE COOLING
GMC SIERRA 1500 2019 110000 ELECTRICAL SYSTEM
CHEVROLET SILVERADO 1500 2019 350000 EQUIPMENT
CHEVROLET SILVERADO 1500 2019 061610 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
CHEVROLET SILVERADO 1500 2019 100000 POWER TRAIN
CHEVROLET SILVERADO 1500 2019 060000 ENGINE AND ENGINE COOLING
CHEVROLET SILVERADO 1500 2019 110000 ELECTRICAL SYSTEM

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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 (20NA218) 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.