GROUNDWORK — 21V421000: Airbags, seat belts and seats recall for BUICK ENVISION and 9 other models BUICK ENVISION and 9 other models: check the listed vehicles, the reported issue and the manufacturer remedy for 21V421000. Keep the official status and service answers in one private record. Campaign: 21V421000 Official record checked: 2026-10-19T20:40:25.063Z Official campaign: https://api.nhtsa.gov/recalls/campaignNumber?campaignNumber=21V421000 Official VIN lookup: https://www.nhtsa.gov/recalls LISTED VEHICLES (VIN confirmation required) 2021 BUICK ENVISION 2021 CADILLAC CT5 2021 CADILLAC CT4 2021 CHEVROLET TAHOE 2021 CHEVROLET SUBURBAN 2021 GMC YUKON 2021 GMC YUKON XL 2021 CADILLAC ESCALADE 2021 CADILLAC ESCALADE ESV 2021 CHEVROLET CORVETTE OFFICIAL REPORTED ISSUE 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. OFFICIAL REPORTED 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. OFFICIAL REPORTED 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. OFFICIAL 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. OWNER PREPARATION Use vehicle documents and existing service records. Leave airbag, belt and seat disassembly or deployment testing to the service provider. REMEDY TIMING IN THE DATED SOURCE Confirm current remedy arrangements The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions. Current availability for your VIN: unconfirmed. YOUR SERVICE QUESTIONS 1. Does the manufacturer confirm that campaign 21V421000 applies to this VIN, including the report’s equipment and production restrictions? A matching model and year is only a starting point. The official lookup or manufacturer must establish the individual vehicle’s status. Discussion status / answer: __________ 2. What remedy, required parts or software, and appointment arrangements are currently available for this VIN, and which interim instructions apply? The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions. Discussion status / answer: __________ 3. Which seating position or restraint component is included, and does the manufacturer give any interim occupancy instruction for this VIN? Compare the answer with the reported components: AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE. Discussion status / answer: __________ 4. Which module and software completion record demonstrate that the update for 21V421000 was applied? The source identifies an over-the-air update option. Ask how completion is confirmed for this vehicle; a downloaded update or notification is not itself a service record. Discussion status / answer: __________ 5. What dated document records the remedy performed under 21V421000, and what should I do if the reported concern remains? Keep campaign completion and unresolved symptoms as separate questions. A saved worksheet or booked appointment does not establish a repair. Discussion status / answer: __________ OFFICIAL LOOKUP DECISIONS Not checked or unavailable: eligibility remains unconfirmed; use the official lookup or manufacturer. Campaign listed as open: confirm current instructions, availability and remedy arrangements. Campaign not listed as open: reconcile repair history and lookup coverage with the manufacturer if needed. A zero-open result does not diagnose symptoms. Work order records completed recall work: keep the exact campaign and dated remedy record; report unresolved symptoms separately. YOUR RECORD Check date: __________ Official lookup result: __________ Service arrangement: __________ Existing observation: __________ Questions and work-order notes (no VIN or plate needed): __________ LOOKUP LIMITS A model/year match does not establish VIN eligibility. The official lookup may omit completed recalls, some recent campaigns or recalls outside its coverage. The listed defect does not prove the cause of a symptom on your vehicle. This guide supports owner preparation and does not provide a repair procedure.