2004 Mercedes Benz SL500 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
45 owner complaints analyzed
0 distinct recall campaigns
76,000 mi median reported failure mileage
Scope: 2004 model year. Data snapshot: . 37 complaints include usable failure mileage.
Most common problems
Suspension is the most frequently named component, appearing in 21 of 45 complaints (46.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 11 | 24.4% |
| Fuel system concerns | 10 | 22.2% |
| Steering behavior | 3 | 6.7% |
| Transmission and shifting | 2 | 4.4% |
| Electrical and battery issues | 2 | 4.4% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Suspension | 21 |
| Service Brakes | 9 |
| Electrical System | 4 |
| Fuel System, Gasoline | 4 |
| Fuel/Propulsion System | 4 |
| Service Brakes, Hydraulic | 3 |
| Wheels | 3 |
| Power Train | 2 |
Suspension: 21; Service Brakes: 9; Electrical System: 4; Fuel System, Gasoline: 4; Fuel/Propulsion System: 4; Service Brakes, Hydraulic: 3; Wheels: 3; Power Train: 2
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 5 |
| 25,000 to 49,999 | 4 |
| 50,000 to 74,999 | 9 |
| 75,000 to 99,999 | 9 |
| 100,000 to 149,999 | 9 |
| 150,000 and above | 1 |
Under 25,000: 5; 25,000 to 49,999: 4; 50,000 to 74,999: 9; 75,000 to 99,999: 9; 100,000 to 149,999: 9; 150,000 and above: 1
50,000 to 74,999 miles has the most reports with usable mileage (9). 8 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2008 | 2 |
| 2010 | 4 |
| 2011 | 4 |
| 2012 | 1 |
| 2014 | 7 |
| 2015 | 5 |
| 2016 | 3 |
| 2017 | 6 |
| 2018 | 4 |
| 2019 | 2 |
| 2020 | 3 |
| 2022 | 1 |
| 2023 | 1 |
| 2026 | 2 |
2008: 2; 2010: 4; 2011: 4; 2012: 1; 2014: 7; 2015: 5; 2016: 3; 2017: 6; 2018: 4; 2019: 2; 2020: 3; 2022: 1; 2023: 1; 2026: 2
Pattern summary
Suspension leads the component reports. Braking behavior appears in 11 complaint narratives. Fuel system concerns appears in 10 complaint narratives. Steering behavior appears in 3 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 10214154 · 2008-01-08 (January 8, 2008)
TL*THE CONTACT OWNS A 2004 MERCEDES BENZ SL500. WHILE DRIVING APPROXIMATELY 10 MPH, THE BRAKES FAILED. THE CONTACT DROVE THE VEHICLE UP A HILL IN ORDER TO STOP AND THEN PULLED INTO HIS DRIVEWAY. THE DEALER WAS NOTIFIED. THE CURRENT AND FAILURE MILEAGES WERE 3,200.
Owner-reported narrative. 3,200 miles reported. Look up ODI 10214154 at NHTSA ↗
Owner report 10644475 · 2014-10-14 (October 14, 2014)
TL* THE CONTACT OWNS A 2004 MERCEDES BENZ SL500. WHILE DRIVING APPROXIMATELY 2 MPH, A WARNING LIGHT SUDDENLY FLASHED THAT INDICATED THAT THE BRAKES WERE FAULTY. THE CONTACT DEPRESSED THE BRAKE PEDAL TO STOP THE VEHICLE, BUT THE BRAKES MALFUNCTIONED AND INCREASED THE STOPPING DISTANCE. THE DEALER STATED THAT THE ELECTRONIC BRAKE BOOSTER WAS FAULTY. THE MANUFACTURER WAS NOTIFIED, BUT NO SOLUTION WAS OFFERED. THE FAILURE MILEAGE WAS 82,000.
Owner-reported narrative. 82,000 miles reported. Look up ODI 10644475 at NHTSA ↗
Owner report 10364000 · 2010-11-04 (November 4, 2010)
BAFFLE IN MY FUEL TANK ON MY 2004 MERCEDES SL 500 HAS BROKEN. CAUSES A LOUD KNOCKING SOUND AND THE ONLY REMEDY IS TO SPEND $3000 TO HAVE THE ENTIRE FUEL TANK REPLACED. THIS IS HAPPENING TO HUNDREDS OF MERCEDES BENZ SL OWNERS. I BELIEVE THIS SHOULD BE HANDLED UNDER A RECALL FROM THE MANUFACTURER. *TR
Owner-reported narrative. 50,000 miles reported. Look up ODI 10364000 at NHTSA ↗
Owner report 10392283 · 2011-03-20 (March 20, 2011)
2004 MERCEDES-BENZ SL500, LOUD KNOCKING NOISE FROM THE REAR.FUEL TANK MIGHT NEED TO BE REPLACED... SEEMS TO BE A COMMON PROBLEM WITH THESE CARS. *TR
Owner-reported narrative. 118,200 miles reported. Look up ODI 10392283 at NHTSA ↗
Owner report 10312445 · 2010-02-21 (February 21, 2010)
ADDENDUM INFO TO ORIGINAL COMPLAINT #10308437 SHOWS THAT MB SERVICE ADVISOR J. STEACH ADVISED M .B. NOT RESPONSIBLE AS DRIVER SHOULD "MISS" POTHOLES. ENGINEERING ANALYSIS SHOWS THAT IT IS NOT POSSIBLE FOR DRIVER TO STEER AROUND POTHOLES. AT 70MPH MB SL500 TRAVELS 103 FT/SEC AND IT IS NOT POSSIBLE TO OBSERVE THE POTHOLE HAZARD AND CATEGORIZE AS SAFETY RISK AT SPEEDS OF 70MPH(103FT/SEC) REACT PHYSIOLOGICALLY AND ACTUATE STEERING SYSTEM -ALL IN LESS THAN ONE SECOND-ONE HALF SECOND EACH FOR HUMAN RESPONSE AND SAME FOR MECHANICAL ACTUATION-INSUFFI…
Owner-reported narrative. 19,000 miles reported. Look up ODI 10312445 at NHTSA ↗
Owner report 10315322 · 2010-03-01 (March 1, 2010)
ACTIVE BODY CONTROL FAILURE ON MERCEDES BENZ SL (MODEL R230) CAUSES THE CAR TO LOWER ALL OF A SUDDEN, LOSS OF CONTROL AND STEERING LOCKING. CAR'S ABC SUSPENSION IS PRESSURIZED, AND IT HAS A HISTORY OF FAILURES. DOCUMENTED ON NHTSA SITE. THE ABC HOSE HAS A RECALL ALREADY, BUT THE ABC PUMP ITSELF CAN GO BAD ANYTIME WITHOUT WARNING. THERE ARE MANY DOCUMENTED CASES, WHICH I HAVE FROM OTHER MERCEDES OWNERS. MINE OCCURRED TRAVELING 35 MPH IN NORTHERN VIRGINIA IN A NEIGHBORHOOD ROAD, AND LUCKILY I PULLED OVER BUT NOTICED MY CAR'S REAR WAS DROPPED 4…
Owner-reported narrative. 36,000 miles reported. Look up ODI 10315322 at NHTSA ↗
Owner report 10232158 · 2008-06-24 (June 24, 2008)
THE AUTOMATIC TRANSMISSION FAILED TO UPSHIFT BEYOND THIRD GEAR WHILE DRIVING DOWN HIGHWAY. COULD ONLY GO 30MPH AS REVS HIGH. HAD TO TAKE VEHICLE TO DEALER TO REPAIR TRANSMISSION. ONLY 39,000 MILES ON CAR. NOT ABUSED. *TR
Owner-reported narrative. 39,000 miles reported. Look up ODI 10232158 at NHTSA ↗
Owner report 10949561 · 2017-02-04 (February 4, 2017)
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. THEY TELL ME AND I QUOTE "WE ARE UNABLE TO WORK ON THIS TRANSMISSION BECAUSE IT REQUIRES SPECIAL TOOLS WHICH ONLY MERCEDES DEALERSHIP CARRY SO YOU WILL HAVE TO TAKE IT TO THEM, SORRY" PLEASE, PLEASE, PLEASE RECALL THIS TRANSMISSION!!! ANOTHER TIME I WAS DIVING DOWN THE HWY DOING 70MPH WHEN THE ABC TOO LOW DASH LIGHT…
Owner-reported narrative. 107,000 miles reported. Look up ODI 10949561 at NHTSA ↗
Owner report 11142891 · 2018-10-26 (October 26, 2018)
DUE TO DETERIORATION OF THE WIRING HARNESS CONNECTION OR FAILURE OF THE HYDRAULIC PUMP, THE SENSOTRONIC BRAKE CONTROL (SBC) SYSTEM MAY DEFAULT TO THE HYDRAULIC BACK-UP MODE. IN THE BACK-UP MODE, THE DRIVER HAS BRAKING POWER SUFFICIENT TO STOP THE VEHICLE, BUT GREATER BRAKE PEDAL PRESSURE IS REQUIRED AND BRAKE PEDAL TRAVEL WILL BE NOTICEABLY LONGER. DEALERS WILL INSTALL A BRACKET AND REPLACEMENT GROUND WIRE TO THE SBC PUMP UNIT ON ALL AFFECTED VEHICLES. ADDITIONALLY, DEALERS WILL INSPECT AND REPLACE THE SSC PUMP UNIT IN CERTAIN SL MODELS. THE ME…
Owner-reported narrative. Look up ODI 11142891 at NHTSA ↗
Owner report 11518528 · 2023-04-23 (April 23, 2023)
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. Vehicle has dual battery, starter in front, convenience battery in trunk and fuses that operate at 130 Amps - the BCM capacitors and circuit board age and at some point can no longer handle the high current and catch fire.
Owner-reported narrative. Look up ODI 11518528 at NHTSA ↗