Buick 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 short version
General Motors, LLC reported a problem with the air bags srs malfunction warning lamp/light. Here is what owners need to know.
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 air bag malfunction indicator light may fail to warn the driver of a problem with the air bag, increasing the risk of injury.
The communications gateway module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge.
Affected vehicles
These model years are included in NHTSA campaign 21V-421.
| YEAR RANGE | MODEL |
|---|---|
| 2021 | Buick Envision |
| 2021 | Cadillac CT4 |
| 2021 | Cadillac CT5 |
| 2021 | Cadillac Escalade |
| 2021 | Cadillac Escalade ESV |
| 2021 | Chevrolet Corvette |
| 2021 | Chevrolet Suburban |
| 2021 | Chevrolet Tahoe |
| 2021 | GMC Yukon |
| 2021 | GMC Yukon XL |
What changed
Newest first. The record shows both when the recall began and what has changed since.
- Recall reported to NHTSA. LATEST
Drive one of these? Check your VIN to see if your specific vehicle is affected.
Check your VINWhat this record means
Data from the NHTSA recall database. A clean VIN check means no open federal recalls for that vehicle — not that it never had one.
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