Buick Recall 21V-421: Air bags – SRS malfunction warning lamp/light

Affected: 2021 Buick Envision, 2021 Cadillac CT4, 2021 Cadillac CT5 and 7 more. Filed with NHTSA on June 10, 2021, covering about 285,622 vehicles.

The problem

General Motors, LLC (GM) is recalling certain 2021 Buick Envision, Cadillac CT4, CT5, Escalade, Escalade ESV, Chevrolet Tahoe, Corvette, Suburban, GMC Yukon, Yukon XL vehicles. The communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module (SDM), causing the air bag malfunction indicator light to inconsistently illuminate.

The risk

The air bag malfunction indicator light may fail to warn the driver of a problem with the air bag, increasing the risk of injury.

The fix

The communications gateway module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed on July 1, 2021. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is N212338110.

Recall details

NHTSA campaign21V-421 (21V421000)
Manufacturer numberN212338110
ManufacturerGeneral Motors, LLC
ComponentAir bags › SRS malfunction warning lamp/light
Report dateJune 10, 2021
Owners notifiedJuly 1, 2021
Vehicles affected285,622
Initiated byManufacturer

Vehicles covered

Owner complaints about the air bags

Frequently asked questions

Is the recall 21V-421 repair free?

Yes. Buick dealers will fix the problem at no cost: The communications gateway module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed on July 1, 2021.

How do I know if my car is included?

Not every vehicle of the listed model years is affected — the recall covers 285,622 vehicles built in a certain window. Check your 17-character VIN with our VIN recall check or at nhtsa.gov/recalls.

Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.