Total Complaints
5 filings
MERCEDES-BENZ SL600 · model year
5 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2004MERCEDES-BENZSL600 carries 5 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 0 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2004 SL600 is electrical system with 2 filings, followed by fuel system, gasoline (1) and fuel system, gasoline:delivery:fuel pump (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 15 investigation files overlapping the 2004 SL600. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
Total Complaints
5 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| ELECTRICAL SYSTEM | 2 |
| FUEL SYSTEM, GASOLINE | 1 |
| FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP | 1 |
| SERVICE BRAKES | 1 |
The safety component that is covered under the SBC warranty is the entire brake master cylinder specifically the part that is bad is the brake pedal position sensor The car is undriveable without it, they have a 25-year warranty on it yet they have no parts and no way to fix it which is obviously unacceptable they've also refused to provide a loaner car until they come up with a way to fix my car leaving me on the side of the road with nothing to drive it's unacceptable! My safety and everybody's safety on the road is affected by this because the car won't stop if you drive it and you have really strong legs you can get it to slow down and eventually stop it's completely unsafe The brake pedal cannot tell the computer where it is in its travel which means the system doesn't know that you're applying the brakes which don't work. Yes the problem has been confirmed by two shops one of which has a snap-on scanner which I can attach the scan to showing the issue and currently the car is s
The safety component that is covered under the SBC warranty is the entire brake master cylinder specifically the part that is bad is the brake pedal position sensor The car is undriveable without it, they have a 25-year warranty on it yet they have no parts and no way to fix it which is obviously unacceptable they've also refused to provide a loaner car until they come up with a way to fix my car leaving me on the side of the road with nothing to drive it's unacceptable! My safety and everybody's safety on the road is affected by this because the car won't stop if you drive it and you have really strong legs you can get it to slow down and eventually stop it's completely unsafe The brake pedal cannot tell the computer where it is in its travel which means the system doesn't know that you're applying the brakes which don't work. Yes the problem has been confirmed by two shops one of which has a snap-on scanner which I can attach the scan to showing the issue and currently the car is s
Mercedes SL600 BCM has electrical issues leading to a fire it is available for inspection. The car can burn down in a garage putting me and all others in or near the dwelling at risk. Yes the problem has been confirmed independently. No BCM issues lead to red light on dash.
TL* THE CONTACT OWNS A 2004 MERCEDES BENZ SL600. THE CONTACT STATED THAT WHILE DRIVING 50 MPH, THE VEHICLE STALLED. THE VEHICLE WAS TAKEN TO A DEALER WHERE THE TECHNICIAN DIAGNOSED THAT THE FUEL TANK NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 40,000 AND THE CURRENT MILEAGE WAS 40,100.
Mileage: 40,000
KNOCKING NOISE BEGIN TO APPEAR BEHIND THE DRIVER'S SEAT. AT FIRST, BELIEVED TO BE LOOSE ITEM IN THE TRUNK BUT CHECK AND CAN'T FIND. LOOKED AT FORUM AND FOUND THAT MANY 2003/2004 MERCEDES BENZ SL CLASS HAS THE SAME PROBLEM WITH DEFECTIVE GAS TANK BAFFLE. WHENEVER I BRAKE OR ACCELERATE, I HEAR THE KNOCKING NOISE, WHICH ALSO KNOCKS TWO OR THREE TIMES EVERYTIME I BRAKE OR ACCELERATE. IT SOUNDS LIKE SOMETHING IS HANGING FROM A STRING OR FLOATING AND THEN BECAUSE OF INERTIA IT KNOCKS AGAINST THE SIDE OF A CONTAINER. THE HAZARD THAT I FEAR IS THAT THE FLOATING MATERIAL IN THE GAS TANK KNOCKS AGAINST THE TANK AND CREATE A SPARK THAT CAN IGNITE THE TANK CAUSING A FIRE. THE KNOCKING NOISE HAPPENS EVERYTIME THE CAR JERKS FROM BRAKING OR ACCELERATING. *TR
Mileage: 86,000
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.