The problem
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2020 GLB250 vehicles. In the event of a crash, the air bag control unit software may not activate the front seat belts and front passenger air bag properly.
The risk
Air bags and seat belts that do not function properly can increase the risk of injury in a crash.
The fix
Dealers will update the air bag control unit software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.
Recall details
| NHTSA campaign | 21V-639 (21V639000) |
|---|---|
| Manufacturer number | 2021080019 |
| Manufacturer | Mercedes-Benz USA, LLC |
| Component | Air bags › Air bag/restraint control module › Software |
| Report date | August 13, 2021 |
| Owners notified | September 17, 2021 |
| Vehicles affected | 66 |
| Initiated by | Manufacturer |
Vehicles covered
Owner complaints about the air bags
Frequently asked questions
Is the recall 21V-639 repair free?
Yes. Mercedes-Benz dealers will fix the problem at no cost: Dealers will update the air bag control unit software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.
How do I know if my car is included?
Not every vehicle of the listed model years is affected — the recall covers 66 vehicles built in a certain window. Check your 17-character VIN with our VIN recall check or at nhtsa.gov/recalls.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.