AI Damage2004 Mercedes-Benz ML500: common problems
Owners of the 2004 Mercedes-Benz ML500 filed 18 complaints with NHTSA, most often about electrical system and steering. Details by component below, with sources.
Key figures
- Owner complaints
- 18
What fails most often
- 1 Electrical system 28% of all complaints
- 2 Steering 28% of all complaints
- 3 Seats 17% of all complaints
- 4 Exterior lighting 11% of all complaints
- 5 Service brakes 11% of all complaints
- 6 Electronic stability control 6% of all complaints
- 7 Engine 6% of all complaints
- 8 Fuel/propulsion system 6% of all complaints
- Electrical system: 5 complaints (28% of all).
- Steering: 5 complaints (28% of all).
- Seats: 3 complaints (17% of all).
- Exterior lighting: 2 complaints (11% of all).
- Service brakes: 2 complaints (11% of all).
Symptoms owners describe
How many of the 18 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) |
|---|---|---|---|
| Electrical system | 5 | 0 | 0 |
| Steering | 5 | 0 | 0 |
| Seats | 3 | 0 | 0 |
| Exterior lighting | 2 | 0 | 0 |
| Service brakes | 2 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Engine | 1 | 0 | 0 |
| Fuel/propulsion system | 1 | 0 | 0 |
| Powertrain | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Tires | 1 | 0 | 0 |
| Visibility | 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.
The contact stated that several unknown warning lights illuminated. The vehicle was towed mercedes benz of cary ([address], cary, [ZIP], [phone]) but was not yet diagnosed nor repaired. The manufacture was not notified of the failure. The failure mileage was 248,000.
While driving 65 mph, the power steering seized. A mechanic confirmed that the power steering hose needed to be replaced. The manufacturer was notified of the issue. The failure mileage was 123,000.
Smell gas when the vehicle is started. Rust around front and rear fenders
Obd system cause the check engine light to illuminate incorrectly 2. Stuck fuel-level sensor cause to report incorrectly 3. The speedometer out of tolerance is reporting incorrectly 4. Obd system is reporting incorrectly causing faults in systems.
I immediately turned off the seat and opened the windows to help cool it off. It took 30 minutes or more for the seat to cool off in that spot. My daughter jumped to the back seat while it was still hot so that she would not get burned again.
The repairs / service included replacing a seal on the power steering pump. Within days of the repair the power steering unit leaked all it's fluid from a hose clamp. Found the recall 08v465000 for this problem which per the recall covered all 1998-2004 mb ml's .
During regular vehicle use the front right headlight stopped working. Upon inspection it was found that the headlight holder had melted under extreme temperatures due to a manufacturers defect in the wiring harness.
2004 mercedes benz ml500 driver seat caught fire while driving. Consumer states that due to the seat catching fire he suffered mild burns on the left hip. The heating pad in the drivers seat shorted out and caused the leather and seat cushion to burn.
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 8,622 of 36,656 model years in the NHTSA data (top 24% most complained about).
On average one model year of the ML500 has 15 complaints (7 years in the data). This year has 18, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Seats. Occupant sensor, power adjustment, seat mounts.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Mercedes-Benz ML500?
Owner complaints to NHTSA most often mention: electrical system, steering, seats. Total complaints: 18. The most frequent symptoms in complaint texts: headlights and tail lights (11%), smoke, burning smell, fire (11%), steering or power steering problems (11%).
How many service bulletins (TSB) were issued for the 2004 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 2004 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 2004 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.