“2021 Buick Envision Air Bags May Not Warn of Problems.” GovInfoNow, updated August 18, 2026. https://govinfonow.com/recall/80274-2021-buick-envision-air-bags-may-not-warn-of-problems. Based on NHTSA recall #21V421000 (https://www.nhtsa.gov/recalls?nhtsaId=21V421000).
General Motors LLC is recalling certain 2021 Buick Envision, Cadillac CT4, CT5, Escalade, Escalade ESV, Chevrolet Tahoe, Corvette, Suburban, GMC Yukon, and Yukon XL vehicles because the air bag malfunction indicator light may fail to warn of a problem, increasing injury risk. The National Highway Traffic Safety Administration announced the recall on Oct. 6, 2021. Owners should have their communications gateway module software updated free of charge.
How to tell if you have it
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, 2021
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. 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.
The hazard
The air bag malfunction indicator light may fail to warn the driver of a problem with the air bag, increasing the risk of injury. General Motors LLC stated that the communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module, causing the light to inconsistently illuminate.
Context
GovInfoNow's records show General Motors LLC has 414 other recalls on record since 2011-02-11. Other recent recalls of similar products include Chevrolet Silverado 2020 Power Train Recall (2026-10-22), Cadillac Lyriq 2024 Rearview Camera Malfunction Risk (2026-10-22), and Chevrolet Silverado 1500 (2017) Air Bag Recall (2026-09-24). NHTSA has received 23 owner complaints for the 2021 Buick Envision, with the latest received on 2026-04-24.
How to tell if you have this one
Check if your 2021 Buick Envision has the air bag warning light that doesn't turn on or off consistently. The recall covers vehicles mailed with notification letters starting July 1, 2021.
Brand
Buick
Category
Vehicle
Based on the official NHTSA remedy
What to do — step by step
Update Software
Contact GM customer service or visit a dealer to update the communications gateway module software for free.
Official remedy
What NHTSA says 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.
How this recall unfolded
Recall timeline
2 dated steps over 3 months.
1Owner letters mailed
2NHTSA received the defect report
Dates from the agency record only; steps without a date are left out.
Take action
Contact Buick
We’ve drafted a message you can send Buick to request your refund or repair — edit it as you like.
Subject: Recall 21V421000 — Buick 2021 Buick Envision Air Bags May Not Warn of Problems
Hello,
I own a 2021 Buick Envision Air Bags May Not Warn of Problems that is covered by recall 21V421000 from Buick.
The official recall notice states: 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.
I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this?
Thank you.
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
Plain-language summary written by qwen3:4b on August 18, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.