AI Damage2003 Mercedes-Benz ML500: common problems
Owners of the 2003 Mercedes-Benz ML500 filed 13 complaints with NHTSA, most often about engine and electrical system. Details by component below, with sources.
Key figures
- Owner complaints
- 13
What fails most often
- 1 Engine 38% of all complaints
- 2 Electrical system 23% of all complaints
- 3 Seats 23% of all complaints
- 4 Service brakes 23% of all complaints
- 5 Steering 23% of all complaints
- 6 Fuel system 8% of all complaints
- 7 Tires 8% of all complaints
- Engine: 5 complaints (38% of all).
- Electrical system: 3 complaints (23% of all).
- Seats: 3 complaints (23% of all).
- Service brakes: 3 complaints (23% of all).
- Steering: 3 complaints (23% of all).
Symptoms owners describe
How many of the 13 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) |
|---|---|---|---|
| Engine | 5 | 0 | 0 |
| Electrical system | 3 | 0 | 0 |
| Seats | 3 | 0 | 0 |
| Service brakes | 3 | 0 | 0 |
| Steering | 3 | 0 | 0 |
| Fuel system | 1 | 0 | 0 |
| Tires | 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.
Tl* the contact owns a 2003 mercedes-benz ml500. The contact stated that the abs indicator kept randomly illuminating and the brake pedal traveled to the floorboard when it was depressed. The vehicle was taken to an independent mechanic, but was not diagnosed or repaired.
However, after its replacement I took it to two mercedes dealership to re-inspect and make adjustment to their installment of the fan but it keeps getting overheated. I also had a new water coolant tank installed but it is also leaking out the coolant and showing the warning light.
Loss of power steering driving on the freeway due to sudden break of idler arm pulley and subsequent shredding of belt. Problem is the pulley is made of plastic and cracked in two, leaving 1/2 the pulley and shredding the belt. This occurred at driving speed of 50 mph and mileage around 169,650 on 2003 ml500.
Power steering brake issue, power steering hose became detached during vehicle operation, could not steer vehicle. Transmission and radio drain, car cut off on me during driving.
The abs warning light illuminated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 81,000...updated 08/06/15 the consumer stated two lines from the reservoir to the hydraulic pressure regulator failed.
Last time I used the heated seats, turned them on the war I always have, but driving down the road my leg felt like it was on fire. One spot in my seat became extremely hot and was smoking. Immediately I turned the seats off and have never used them again. Called dealer to ask if there was a recall, but no.
The contact stated that while driving approximately 25 mph, smoke emitted from the driver's seat. The vehicle was taken to the dealer but was neither diagnosed nor repaired. The manufacturer was contacted. The failure mileage was 133,000. The vin was unavailable.
While driving approximately 35 mph, the contact smelled a burning odor as his left pant leg caught on fire. The contact sustained a small burn to the leg. The contact stopped the vehicle and noticed sparks and a small flame coming through a small hole on the front passenger's seat.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 9,843 of 36,656 model years in the NHTSA data (top 27% most complained about).
On average one model year of the ML500 has 15 complaints (7 years in the data). This year has 13, below average.
What to check before buying
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Seats. Occupant sensor, power adjustment, seat mounts.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Mercedes-Benz ML500?
Owner complaints to NHTSA most often mention: engine, electrical system, seats. Total complaints: 13. The most frequent symptoms in complaint texts: smoke, burning smell, fire (23%), steering or power steering problems (23%), warning lights, check engine (15%).
How many service bulletins (TSB) were issued for the 2003 Mercedes-Benz ML500?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2003 Mercedes-Benz ML500 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2003 models
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 2026-11-05.