AI Damage2004 Mercedes-Benz SL500: common problems
Owners of the 2004 Mercedes-Benz SL500 filed 45 complaints with NHTSA, most often about suspension and service brakes. Details by component below, with sources.
Key figures
- Owner complaints
- 45
- involving a crash
- 4
What fails most often
- 1 Suspension 47% of all complaints
- 2 Service brakes 24% of all complaints
- 3 Fuel system 11% of all complaints
- 4 Electrical system 9% of all complaints
- 5 Fuel/propulsion system 9% of all complaints
- 6 Powertrain 7% of all complaints
- 7 Wheels 7% of all complaints
- 8 Vehicle speed control 4% of all complaints
- Suspension: 21 complaints (47% of all), 1 of them with a crash reported by the owner.
- Service brakes: 11 complaints (24% of all), 2 of them with a crash reported by the owner.
- Fuel system: 5 complaints (11% of all).
- Electrical system: 4 complaints (9% of all).
- Fuel/propulsion system: 4 complaints (9% of all).
Symptoms owners describe
How many of the 45 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) |
|---|---|---|---|
| Suspension | 21 | 1 | 0 |
| Service brakes | 11 | 2 | 0 |
| Fuel system | 5 | 0 | 0 |
| Electrical system | 4 | 0 | 0 |
| Fuel/propulsion system | 4 | 0 | 0 |
| Powertrain | 3 | 0 | 0 |
| Wheels | 3 | 1 | 0 |
| Vehicle speed control | 2 | 0 | 0 |
| Air bags | 1 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Other | 2 | 1 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
How ever, upon my attempting to stop the brakes suddenly failed and an a red warning light came on "stop" my vehicle failed to stop and I collided into the vehicle in front of me causing injury to the other driver and myself. There was never a wad ailedhning light that the abs system was failing.
The 2003-2006 R230 series seem to have a problem with the BCM (Battery Control Module) as start an electrical fire in the trunk. Very common issue and a safety hazard - this is what happened with my car.
On july 22, 2020 the vehicle (2004 mercedes-benz sl500 (r230)began making a loud banging noise in the rear when stopping and turning. I delivered the vehicle to a local shop where the vehicle was diagnosed as having a broken baffle in the fuel tank. The only solution is to replace the entire fuel tank.
I experience a strong odor of fuel when entering my vehicle and when driving the vehicle, also when driving the vehicle I heart a loud thumping sound coming from the trunk area. Sounds to me as though something is floating inside gas tank.
When the vehicle was started, the contact heard an abnormal knocking sound underneath the vehicle near the fuel tank. Additionally, there was a constant fuel odor inside the vehicle.
Nov 14 early morning a fire started in the truck of my car. Completely destroyed the car. Was parked in my garage. Truck was empty. Had just used car morning of nov 13 and all was fine. *****please see images img_1733, img_1734 and img_1738 thank you.
The red abc light came on saying stop to low to drive followed by red srs light (safety restraint system/ air bags) the internet reviles a multitude of owners of this class and year mercedes benz having the same problem due to a ruptured hydraulic line
I live in texas and my mercedes went into limp mode at a red light. I can not get my transmission repaired anywhere else because they have made it impossible for any other shops to be able to service this specific transmission.
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 5,632 of 36,659 model years in the NHTSA data (top 15% most complained about).
On average one model year of the SL500 has 14 complaints (16 years in the data). This year has 45, above average.
What to check before buying
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Mercedes-Benz SL500?
Owner complaints to NHTSA most often mention: suspension, service brakes, fuel system. Total complaints: 45. The most frequent symptoms in complaint texts: warning lights, check engine (24%), knocking, grinding or other noise (16%), smoke, burning smell, fire (7%).
How many service bulletins (TSB) were issued for the 2004 Mercedes-Benz SL500?
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 SL500 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 2026-11-06.