Recall 21V404 affects 16 2020 Mercedes-Benz Glb 250 vehicles because side curtain air bags can deploy improperly. Repair is free at any franchised Mercedes-Benz dealer.
Mercedes-Benz is recalling 16 2020 Glb 250 SUVs because the side curtain air bags can fail to deploy properly during a crash. Air bags that do not deploy as intended can increase the risk of injury, and Mercedes-Benz dealers will complete the recall repair free of charge.
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What's wrong?
The curtain airbags in a 2020 Mercedes-Benz Glb 250 sit along the roof rails on the driver and passenger sides. In certain crashes, they inflate downward beside the windows to help protect occupants' heads and upper bodies from the glass, pillars, and outside objects. They have to deploy in the right shape and position to do that job.
On affected vehicles, unapproved curtain airbag versions were installed during early production. Mercedes-Benz traced the issue to a production-process deviation, where certain vehicles left the plant before the required airbag replacement was completed. Those airbags met internal checks at one stage, but later testing found certain airbag and cushion combinations did not meet all deployment requirements. In a crash, that means the side curtain airbags can deploy incorrectly or fail to provide the intended protection.
There is no warning sign before failure. The driver will not get an advance warning because the problem is in how the airbag deploys during a crash, not in a part you can feel during normal driving.
Who's affected?
| 2020 Mercedes-Benz Glb 250 | side curtain air bag |
|---|---|
| Units affected | 16 |
| Field incidents | NHTSA has logged no field incidents to date. |
Not every 2020 Mercedes-Benz Glb 250 is on the list. Check your VIN to confirm whether your specific SUV is included.
What's the safety risk?
If the side curtain air bags fail to deploy as intended, occupants face a higher risk of injury in a crash. There is no warning sign before failure, so schedule the recall repair soon if your VIN is included. Repair is free at any franchised Mercedes-Benz dealer.
What should I do?
- Check your VIN to confirm your 2020 Mercedes-Benz Glb 250 is included in this recall.
- Contact a franchised Mercedes-Benz dealer to schedule the free side-curtain-air-bag replacement that addresses improper deployment in a crash.
- Bring the recall notice if Mercedes-Benz mailed one. If not, reference recall number 21V404 when you call.
- Call Mercedes-Benz customer service at 1-800-367-6372 with questions about the dealer repair.
- Drive with extra care until the repair is complete; the recall involves side curtain air bags that can fail to deploy as intended during a crash.
What happens at the repair
At the dealer, a Mercedes-Benz technician replaces the side curtain air bags covered by recall 21V404. The replacement parts and labor are free under the recall. Repairs already paid out of pocket are handled through the new vehicle warranty, not through a separate reimbursement program, because the involved vehicles remained under warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| May 28, 2021 | NHTSA published the recall |
|---|---|
| June 7, 2021 | Dealer notification began |
| July 16, 2021 | Interim owner notification (was planned for this date) |
| September 24, 2021 | Owner notification mailed |
Frequently asked questions
What is recall 21V404?
Recall 21V404 covers 16 2020 Mercedes-Benz Glb 250 vehicles with side curtain air bags that do not deploy properly during a crash. Mercedes-Benz dealers will replace the side curtain air bags for free.
What should I do if my 2020 Mercedes-Benz Glb 250 is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V404. If it is, contact a franchised Mercedes-Benz dealer to schedule the side curtain air bag replacement. Reference recall number 21V404 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair recall defects at no cost, and Mercedes-Benz dealers will replace the affected side curtain air bags free of charge. Parts and labor are covered for included vehicles.
What is the safety risk in recall 21V404?
The risk is higher injury exposure in a crash. The side curtain air bags on included 2020 Mercedes-Benz Glb 250 vehicles do not deploy as intended, which reduces their protection for occupants during a collision.
When were owners notified about recall 21V404?
Mercedes-Benz mailed owner notification letters on September 24, 2021. If you bought the vehicle used or never received a letter, check your VIN and call a franchised Mercedes-Benz dealer with recall number 21V404.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V404000 |
|---|---|
| Mercedes-Benz customer service | 1-800-367-6372 |
| NHTSA recall # | 21V404 |
| NHTSA recall # (full) | 21V404000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 23, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →