Recall 15V647 affects 4 2015 Mercedes-Benz S550E vehicles for fuel pump output that can cause stalling. Free repair at a franchised Mercedes-Benz dealer.
Mercedes-Benz is recalling 4 2015 S550E vehicles because after electric-mode driving, fuel pump output can be too low to restart the gasoline engine. If the engine does not restart, the vehicle stalls and the crash risk rises; Mercedes-Benz dealers will complete the recall repair free of charge.
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What's wrong?
The fuel system control unit on the 2015 Mercedes-Benz S550E is the computer that coordinates fuel delivery for the gasoline engine. It works with the fuel pump, which supplies gasoline at the pressure the engine needs when the hybrid system switches from electric driving back to gasoline power.
On affected vehicles, the software in that control unit can lose synchronization with the fuel pump after the car has been driven in electric mode. When the gasoline engine needs to restart, the pump output can be too low. The engine then does not get enough fuel to restart and the vehicle stalls instead of continuing under gasoline power.
There is no warning sign before failure. The problem happens during the transition from electric driving to the gasoline engine, so an owner should not expect a warning light, noise, or gradual change before the stall.
Who's affected?
| 2015 Mercedes-Benz S550E | fuel system |
|---|---|
| Units affected | 4 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching 2015 Mercedes-Benz S550E does not guarantee inclusion. Check your VIN to confirm whether your specific sedan is included.
What's the safety risk?
A vehicle stall can leave the S550E without power in traffic and increases the risk of a crash. If the engine loses power, move out of traffic when safe, stop, and call a Mercedes-Benz dealer for repair scheduling. Repair is free at any franchised Mercedes-Benz dealer.
What should I do?
- Check your VIN to confirm your 2015 Mercedes-Benz S550E is included in this recall.
- Contact a franchised Mercedes-Benz dealer to schedule the free fuel system control unit software update that addresses the fuel-pump restart problem after electric driving.
- Bring the recall notice if Mercedes-Benz mailed one. Reference recall number 15V647 when you call.
- Drive cautiously until the repair is complete; a stall increases crash risk.
What happens at the repair
At the dealer, a Mercedes-Benz technician updates the fuel system control unit software so the fuel pump command can support restarting the gasoline engine after electric driving. The software update and labor are free under the recall. Mercedes-Benz is not providing a separate reimbursement program for repairs paid before the recall notice because the involved 2015 vehicles were covered by the new vehicle warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| October 13, 2015 | NHTSA published the recall |
|---|---|
| November 9, 2015 | Owner notification mailed |
Frequently asked questions
What is recall 15V647?
Recall 15V647 covers 4 2015 Mercedes-Benz S550E vehicles where fuel pump output can be insufficient after electric-mode driving, causing the gasoline engine to stall. Mercedes-Benz dealers will update the fuel system control unit software for free.
What should I do if my 2015 Mercedes-Benz S550E is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 15V647. If it is, contact a franchised Mercedes-Benz dealer to schedule the fuel system control unit software update. Reference recall number 15V647 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mercedes-Benz dealers will update the fuel system control unit software free of charge. Parts and labor are covered for included vehicles.
What is the safety risk in recall 15V647?
The safety risk is a vehicle stall after driving in electric mode. The fuel pump output can be too low to restart the gasoline engine, and a stall increases crash risk. If your VIN is included, arrange the free Mercedes-Benz dealer repair.
What if I bought my Mercedes-Benz S550E used?
The free recall repair still applies. Recall coverage follows the vehicle, not the first owner. Check your VIN to confirm whether your specific S550E is included, then contact a franchised Mercedes-Benz dealer and reference recall number 15V647.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/15V647000 |
|---|---|
| Mercedes-Benz customer service | 1-800-367-6372 |
| NHTSA recall # | 15V647 |
| NHTSA recall # (full) | 15V647000 |
Source documents
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →