Vehicle recall 21V421000 · June 10, 2021
Chevrolet Corvette, Cadillac CT4 and 8 more models
The communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module (SDM), causing the air bag malfunction indicator light to…
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- 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.
- Consequence
- The air bag malfunction indicator light may fail to warn the driver of a problem with the air bag, increasing the risk of injury.
- Remedy
- 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.
- Notes
- 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.
Recall details
- NHTSA campaign
- 21V421000
- Reported to NHTSA
- June 10, 2021
- Filed by
- General Motors, LLC
- Manufacturer campaign
- N212338110
- Owner notification
- July 1, 2021
- Vehicles potentially affected
- 285,622
- Initiated by
- the manufacturer
- Components
- Air bags › SRS malfunction warning lamp/light; Electrical system › Software
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Buick Envision (2021): 2021
- Cadillac CT4 (2021): 2021
- Cadillac CT5 (2021): 2021
- Cadillac Escalade (2021): 2021
- Cadillac Escalade ESV (2021): 2021
- Chevrolet Corvette (2021): 2021
- Chevrolet Suburban (2021): 2021
- Chevrolet Tahoe (2021): 2021
- GMC Yukon (2021): 2021
- GMC Yukon XL (2021): 2021
Has your Buick been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Buick dealer can also check your VIN. Recall repairs are free.