Recall 24V446 affects 1,058 2022-2023 Mercedes-Benz C 300 vehicles for a loose pre-fuse-box wire connection. Repair is free at any franchised Mercedes-Benz dealer.
Mercedes-Benz is recalling 1,058 2022-2023 C 300 vehicles because the bolt securing an electrical wire to the pre-fuse box was improperly tightened, which lets the wire overheat. An overheated wire can start a fire or cause a sudden loss of drive power, increasing crash risk, and Mercedes-Benz dealers will repair the connection free of charge.
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What's wrong?
The pre-fuse box distributes high-current electrical power and protects circuits before power travels farther into the vehicle. In the 2022-2023 Mercedes-Benz C 300, a wiring harness is attached to that box by a bolted electrical connection, so the bolt has to hold the wire tightly enough for steady current flow.
On affected vehicles, that bolt was not tightened to the specified torque during production rework. A loose electrical connection creates extra resistance at the contact point, which turns electrical load into heat. That heat can build at the wire and pre-fuse box connection until the wire overheats.
There is no warning sign before failure. If the issue occurs, the driver can see a warning message in the instrument cluster, but the recall issue is the overheated connection itself, not the message.
Who's affected?
The scope is split by model year, and each listed C 300 uses the same bolted-connection part in the wiring system.
| 2022 Mercedes-Benz C 300 | wiring |
|---|---|
| 2023 Mercedes-Benz C 300 | wiring |
| Units affected | 1,058 |
| 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 sedan is included.
What's the safety risk?
An overheated wire can start a fire and cause a sudden loss of drive power, increasing crash risk. There is no warning before the wiring overheats; a message can appear only when the issue occurs. Schedule the inspection and wiring rework soon. Repair is free at any franchised Mercedes-Benz dealer.
What should I do?
- Check your VIN to confirm your 2022-2023 Mercedes-Benz C 300 is included in this recall.
- Contact a franchised Mercedes-Benz dealer to schedule the free wiring-harness inspection and rework for the overheated pre-fuse-box wire risk.
- Bring the recall notice if Mercedes-Benz mailed one, and reference recall number 24V446 when you call.
- Ask the dealer for driving guidance before the appointment because the recall involves fire and sudden loss of drive power.
What happens at the repair
At the dealer, a Mercedes-Benz technician inspects the wiring harness connected to the pre-fuse box and reworks it as needed so the electrical connection is secure. The recall repair is available now, and parts and labor are covered. Out-of-pocket repairs already paid are handled through the new vehicle warranty, not through a separate reimbursement program, because the involved vehicles remain under warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| June 14, 2024 | NHTSA published the recall |
|---|---|
| June 24, 2024 | Dealer notification began |
| August 2, 2024 | Owner notification mailed |
| August 2, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 2, 2024 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V446?
Recall 24V446 covers 1,058 2022-2023 Mercedes-Benz C 300 vehicles with an electrical wire at the pre-fuse box that was not tightened correctly. The wire can overheat, causing fire or sudden loss of drive power. Mercedes-Benz dealers will inspect and rework the wiring harness for free.
What should I do if my 2022-2023 Mercedes-Benz C 300 is on this recall?
Check your VIN to confirm your specific C 300 is included in recall 24V446. If it is, contact a franchised Mercedes-Benz dealer to schedule the wiring harness inspection and repair. Reference recall number 24V446 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost. Mercedes-Benz dealers will inspect the pre-fuse-box wiring harness and rework it as needed free of charge.
What is the safety risk?
The safety risk is fire or sudden loss of drive power from an overheated wire. That can increase crash risk. If your VIN is included, schedule the free dealer inspection and wiring-harness repair before delaying normal service.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V446000 |
|---|---|
| Mercedes-Benz customer service | 1-877-496-3691 |
| NHTSA recall # | 24V446 |
| NHTSA recall # (full) | 24V446000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notice (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (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 →