2021 Buick Envision, 2021 Cadillac CT4, 2021 Cadillac CT5 and 7 other models Recall: Communications gateway module incorrectly processes a loss of…
NHTSA campaign 21V421000 · Air Bags · filed Jun 10, 2021 · verified Jul 30, 2026
The defect
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.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
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.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
Related recalls
More Buick Envision recalls
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Other campaigns involving Buick vehicles
Source: NHTSA recall database, campaign 21V421000 (manufacturer number N212338110). Data last verified Jul 30, 2026.