Recall 25V129 covers 2,943 2023-2025 Mercedes-Benz AMG hybrid vehicles for a starter-alternator control-unit software error. Repair is free at any franchised Mercedes-Benz dealer.
Mercedes-Benz is recalling 2,943 2023-2025 AMG GT63 S E, AMG S 63 E, and other hybrid AMG models because a software error can make the high-voltage starter alternator control unit fail. That failure can cause loss of drive power and increase crash risk, and Mercedes-Benz dealers will update the software free of charge.
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What's wrong?
The high-voltage starter alternator control unit in the 2023-2025 Mercedes-Benz AMG hybrid models helps manage the electric hardware that starts the engine and supports propulsion. In normal operation, its software keeps the starter alternator communicating with the hybrid powertrain so the vehicle can start and deliver drive power as expected.
On affected vehicles, the control-unit software has a deviation that causes sporadic processor overload. When that overload happens, the high-voltage starter alternator control unit can fail. The result is a loss of drive power, which is the safety concern in NHTSA campaign 25V129. Mercedes-Benz identified vehicles outside the recall population as having starter alternator software that meets current production specifications.
There is no warning sign before failure. If the issue occurs, the driver will see several warning messages in the instrument cluster, which is the display area behind the steering wheel.
Who's affected?
Spans 6 AMG model lines across the 2023, 2024, and 2025 model years, all tied to the electric propulsion system.
| 2025 Mercedes-Benz AMG GT63 S E | electric propulsion system |
|---|---|
| 2025 Mercedes-Benz AMG GLC63 S E 4MATIC+ Coupe | electric propulsion system |
| 2023 Mercedes-Benz AMG S 63 E | electric propulsion system |
| 2023 Mercedes-Benz AMG GT 63 S E Coupe | electric propulsion system |
| 2024 Mercedes-Benz AMG S 63 E | electric propulsion system |
| 2025 Mercedes-Benz AMG S 63 E | electric propulsion system |
| 2025 Mercedes-Benz AMG GLC63 S E | electric propulsion system |
| 2024 Mercedes-Benz AMG GT63 S E | electric propulsion system |
| 2025 Mercedes-Benz AMG SL63 S E | electric propulsion system |
| 2024 Mercedes-Benz AMG SL63 S E | electric propulsion system |
| Units affected | 2,943 |
| 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 this recall applies to your specific vehicle.
What's the safety risk?
A loss of drive power increases the risk of a crash because the vehicle no longer responds as expected in traffic. There is no warning before the failure starts; warning messages appear in the instrument cluster once it happens. Schedule the software update soon. Repair is free at any franchised Mercedes-Benz dealer.
What should I do?
- Check your VIN to confirm your 2023-2025 Mercedes-Benz AMG GT63 S E, AMG GLC63 S E 4MATIC+ Coupe, AMG S 63 E, AMG GT 63 S E Coupe, AMG GLC63 S E, or AMG SL63 S E is included in this recall.
- Contact a franchised Mercedes-Benz dealer to schedule the free high-voltage starter alternator software update that fixes the loss-of-drive-power fault.
- Bring the owner letter if you have it. If not, reference recall number 25V129 when you call.
- Ask the dealer whether the vehicle should be driven before the software update if you notice reduced or lost drive power.
- Call Mercedes-Benz customer service at 1-800-367-6372 with questions about the recall or repair timing.
What happens at the repair
At the dealer, a Mercedes-Benz technician updates the high-voltage starter alternator control unit software. That software controls part of the hybrid drive system, so the repair is handled as a software update rather than a parts replacement. The recall repair is free, with no charge for the dealer work. After the update, ask the service desk to confirm the recall campaign is closed on the repair order.
Timeline
| February 28, 2025 | NHTSA published the recall |
|---|---|
| March 7, 2025 | Dealer notification began |
| March 7, 2025 | Dealer notification ended |
| April 11, 2025 | Owner notification mailed |
Frequently asked questions
What is recall 25V129?
Recall 25V129 covers 2,943 2023-2025 Mercedes-Benz AMG hybrid vehicles with a software error in the high-voltage starter alternator control unit. The failure can cause a loss of drive power, increasing crash risk. Mercedes-Benz dealers will update the control unit software for free.
What should I do if my 2023-2025 Mercedes-Benz AMG hybrid vehicle is on this recall?
Check your VIN to confirm your vehicle is included in recall 25V129. If it is, contact a franchised Mercedes-Benz dealer to schedule the high-voltage starter alternator control unit software update. Reference recall number 25V129 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, and Mercedes-Benz will update the high-voltage starter alternator control unit software free of charge at any franchised Mercedes-Benz dealer.
What is the safety risk in recall 25V129?
The safety risk is loss of drive power. Mercedes-Benz reported that a software error can cause the high-voltage starter alternator control unit to fail, which increases crash risk. If your VIN is included, schedule the free dealer software update.
When did Mercedes-Benz notify owners about recall 25V129?
Mercedes-Benz mailed owner notification letters on April 11, 2025. If you bought the vehicle used or never received a letter, check your VIN to confirm whether your AMG hybrid vehicle is included, then call a Mercedes-Benz dealer with recall number 25V129.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V129000 |
|---|---|
| Mercedes-Benz customer service | 1-800-367-6372 |
| NHTSA recall # | 25V129 |
| NHTSA recall # (full) | 25V129000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Report (PDF)
- Download Owner Notice (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →