Recall 21V483 covers 4,917 2021-2022 Mercedes-Benz vehicles because rear seat belt retractors can leave child restraints unsecured. Repair is free at any franchised Mercedes-Benz dealer.
Mercedes-Benz is recalling 4,917 2021-2022 E 350, E 450, Cls 450, G 550, and AMG vehicles because the rear seat belt automatic locking retractors can deactivate too early. That can keep a child restraint from securing properly and increase injury risk during a crash; Mercedes-Benz dealers will complete the recall repair free of charge.
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What's wrong?
The rear seat belt in affected 2021-2022 Mercedes-Benz vehicles includes an automatic locking retractor, or ALR. When you pull the belt all the way out to install a child restraint, the ALR is supposed to switch the belt from normal passenger use into a locked mode. As the webbing feeds back in, the retractor clicks and keeps the belt from loosening.
In this recall, the ALR sensor lever in the rear seat belt assembly was built out of tolerance by a supplier. That means the locking function can shut off too early, before the belt webbing has fully retracted. If that happens while a child restraint is secured with the seat belt instead of LATCH, the seat can stay looser than intended.
The warning sign is the clicking sound. If the ALR clicks at first, then stops before the belt is fully retracted, the locking function has deactivated early.
Who's affected?
Scope reaches beyond E 350 and E 450 sedans to Cls 450, AMG CLS53, AMG GT, G 550, and AMG G63 variants tied to the same rear seat belt retractor.
| 2021 Mercedes-Benz E 350 | seat belt |
|---|---|
| 2021 Mercedes-Benz E 450 | seat belt |
| 2021 Mercedes-Benz AMG E53 | seat belt |
| 2021 Mercedes-Benz AMG E63 | seat belt |
| 2021 Mercedes-Benz Cls 450 | seat belt |
| 2021 Mercedes-Benz AMG CLS53 | seat belt |
| 2021 Mercedes-Benz AMG GT43 | seat belt |
| 2021 Mercedes-Benz AMG GT53 | seat belt |
| 2021 Mercedes-Benz AMG GT63 | seat belt |
| 2021 Mercedes-Benz G 550 | seat belt |
| 2021 Mercedes-Benz AMG G63 | seat belt |
| 2022 Mercedes-Benz Cls 450 | seat belt |
| 2022 Mercedes-Benz AMG E63 | seat belt |
| Units affected | 4,917 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific vehicle is included.
What's the safety risk?
A child restraint that is not fully secured can increase the risk of injury during a crash. When securing a child seat with the seat belt, the ALR clicking stops before the belt webbing fully retracts. Use that as a warning sign and schedule the repair soon. Repair is free at any franchised Mercedes-Benz dealer.
What should I do?
- Check your VIN to confirm your 2021-2022 Mercedes-Benz vehicle is included in this recall.
- Contact a franchised Mercedes-Benz dealer to schedule the free rear seat belt inspection and any needed assembly replacement that fixes the automatic-locking retractor issue.
- Bring the recall notice if you have it, or reference recall number 21V483 when you call.
- Avoid using an affected rear seat belt for a child restraint until the dealer completes the inspection or replacement.
What happens at the repair
At the dealer, a Mercedes-Benz technician inspects the rear seat belt assemblies, including the automatic locking retractors used to secure a child restraint, and replaces affected assemblies as needed. The inspection, replacement parts, and labor are free under the recall. Out-of-pocket repairs already paid are handled through the existing warranty, not through a separate reimbursement program, since the involved vehicles were not previously subject to this condition. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| June 25, 2021 | NHTSA published the recall |
|---|---|
| July 7, 2021 | Dealer notification began |
| August 13, 2021 | Interim owner notification (was planned for this date) |
| September 24, 2021 | Owner notification mailed |
| September 24, 2021 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
Frequently asked questions
What is recall 21V483?
Recall 21V483 covers 4,917 2021-2022 Mercedes-Benz E 350, E 450, AMG E53, AMG E63, Cls 450, AMG CLS53, AMG GT43, AMG GT53, AMG GT63, G 550, and AMG G63 vehicles with rear seat belt automatic locking retractors that can deactivate early. Mercedes-Benz dealers will inspect and replace the rear seat belt assemblies for free.
What should I do if my 2021-2022 Mercedes-Benz E 350, E 450, AMG E53, AMG E63, Cls 450, AMG CLS53, AMG GT43, AMG GT53, AMG GT63, G 550, or AMG G63 is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V483. If it is, call a franchised Mercedes-Benz dealer and schedule the rear seat belt inspection. Reference recall 21V483 when you call. The dealer will replace the rear seat belt assemblies if needed.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Mercedes-Benz says dealers will inspect and replace the rear seat belt assemblies as necessary free of charge. Use a franchised Mercedes-Benz dealer for the recall repair.
What is the safety risk?
The safety risk is an unsecured child restraint system. If the rear seat belt automatic locking retractor deactivates early, the child restraint system can fail to stay secured properly, increasing the risk of injury during a crash.
When were owners notified about recall 21V483?
Mercedes-Benz mailed an interim owner letter on August 13, 2021, and mailed the final owner letter 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 21V483.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V483000 |
|---|---|
| Mercedes-Benz customer service | 1-800-367-6372 |
| NHTSA recall # | 21V483 |
| NHTSA recall # (full) | 21V483000 |
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 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →