AI DamageMercedes-Benz ML550: problems, complaints, bulletins
Summary for the Mercedes-Benz ML550 across 7 model years: 40 owner complaints and 0 NHTSA service bulletins, plus repair videos. Pick a year for details.
Model years
What fails most often
- 1 Air bags 23% of all complaints
- 2 Electrical system 20% of all complaints
- 3 Service brakes 15% of all complaints
- 4 Steering 13% of all complaints
- 5 Engine 8% of all complaints
- 6 Exterior lighting 8% of all complaints
- 7 Fuel/propulsion system 5% of all complaints
- 8 Seat belts 5% of all complaints
- Air bags: 9 complaints (23% of all), 1 of them with a crash reported by the owner.
- Electrical system: 8 complaints (20% of all).
- Service brakes: 6 complaints (15% of all).
- Steering: 5 complaints (13% of all).
- Engine: 3 complaints (8% of all).
Symptoms owners describe
How many of the 40 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Air bags | 9 | 1 | 0 |
| Electrical system | 8 | 0 | 0 |
| Service brakes | 6 | 0 | 0 |
| Steering | 5 | 0 | 0 |
| Engine | 3 | 0 | 0 |
| Exterior lighting | 3 | 0 | 0 |
| Fuel/propulsion system | 2 | 0 | 0 |
| Seat belts | 2 | 0 | 0 |
| Tires | 2 | 0 | 0 |
| Visibility | 2 | 0 | 0 |
| Backover prevention | 1 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Lane departure | 1 | 0 | 0 |
| Powertrain | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Takata recall. I had an auto collision in 2008, where vehicle front had to be replaced. My insurance company (aaa) paid $40,000.00 for repairs. The airbags didn't activate. Maybe I should thank the lord, it didn't activate.
*2012 ML550 benz fuel pump control module Re: Formal Demand for Repair â Fuel Pump Control Unit Replacement Vehicle: MercedesâBenz ML550 VIN: [XXX] Recall: NHTSA Recall Campaign No.
Engine died and won't run. Known issue with MB balance shaft that they refuse to repair or help with the cost of a $8k job. Highly disappointed.
The contact stated while driving at various speeds and depressing the brake pedal, the brake pedal went to the floorboard and seized. Additionally, the vehicle failed to respond. There was no warning light illuminated. The contact continuously depressed the brake pedal until the brake pedal raised off the floorboard.
In the last year, randomly, when starting the vehicle, the yellow check engine light comes on. Turn the vehicle off, it is gone. The side view mirrors have the yellow lights lit up on them when driving down any road, the red warning lights that tell you there's something behind or in front of you start going off for…
The turn indicators stop working suddenly and randomly giving inaccurate/false indication to the driver of the vehicle that indicators are turned on and no indication of turn signal to the other drivers that can be hazardous especially at the 4 way stop signs where other drivers are assuming that vehicle is going…
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
What to check before buying
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
Other models of this make
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.