Total Complaints
20 filings
MERCEDES-BENZ SL550 · model year
20 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2009MERCEDES-BENZSL550 carries 20 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 1 fire, 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 2009 SL550 is service brakes with 5 filings, followed by tires (4) and wheels (4). 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 2009 SL550. 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
20 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| SERVICE BRAKES | 5 |
| TIRES | 4 |
| WHEELS | 4 |
| ELECTRICAL SYSTEM | 3 |
| TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS | 1 |
| SERVICE BRAKES, HYDRAULIC | 1 |
| STRUCTURE | 1 |
| STRUCTURE:BODY | 1 |
I'm reporting a SERIOUS SAFETY ISSUE affecting all Mercedes-Benz R230 series SL roadsters, model years 2003â2012, of which approximately 85,000 were sold in the United States: ⢠There are numerous reports on R230 SL owners' online forums that an electrical device located in the trunk of these vehicles known as the BCM [Battery Control Module] is prone to CATASTROPHIC FAILURE and melt-down. ⢠The failed BCM can subsequently CATCH FIRE â potentially destroying the vehicle and endangering lives and property nearby. See photos attached from one SL owner's experience. ⢠MBUSA, its dealers, many SL owners, independent service centers and salvage yards are aware of this problem: multiple reports detailing it can easily be found on the Internet. Possible modifications to alleviate the danger have been affected by some SL owners, one picture of which has been uploaded here. ⢠Mercedes-Benz is surely aware of the issue but has not recalled nor issued TSBs associated with this seriou
Complete brake failure while driving. No one was injured but the vehicle could not be stopped until the transmission went into limp mode with still no brakes. Now the ABS and SRS lights on. Brake pedal to the floor. I completely have new brakes speed sensors fluid exchanges and more. The current recall doesnât seem to cover my vehicle. I contacted the dealership and they said there are no open recalls.
This particular model 2009 Mercedes SL 550 hardtop convertible 5.5 liter motor has two batteries and accessory battery that battery thatâs located in the trunk in the main starting battery thatâs on the firewall. These batteries are both new in OEM recommended. If the car sits for 24 hours, it will not start. The electrical system is completely drained. There are many forms describing the same issue but yet the SL model is not included in a civil lawsuit. Mercedes-Benz definitely knows they have an issue in somehow it needs to be rectified.
[XXX] [XXX] [XXX] VIN # [XXX] SL550 2009 Since I bought this car 3 years ago the first day I am using it I got the problem say Reduced Braking Power, Depress Brake Pedal fully. I thought only when the weather is cold but now after 15 minutes minutes I am running on the road losing brake it is scary not only one time its always every 30 minutes now . I am stop using for a while . I try to bring in dealer for diagnose last 2 years ago they cant find the problem even my person mechanic. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).
I bought the almost 3 years now since I bought it I seen and message on the dash board Reduced Braking Power Depress Brake Pedal fully . I search on the website most the Mercedez Benz has same problem but when check my Vin number I saw no issue on my SL550 2009. I almost depress on my car ill spend a lot of money and its dangerous to used it I went to a dealer 2 years ago for but on their diagnose they don saw anything about this issue. Before its happen only when the weather is cold and car cold too but now while you on the road keep losing brake
The brake handle popped off for parking brake
Catastrophic brake failure. No brakes at all.
MY CAR WAS PARKED AND I ATTEMPTED TO OPEN THE DRIVER'S DOOR AS I WAS SEATED IN DRIVER'S SEAT AND I HEARD A LOUD POPPING NOISE. THE DOOR LOCK MECHANISM HAS FAILED SUCH THAT THE DRIVER'S DOOR CAN NOT BE OPENED FROM THE INTERIOR WHICH PRESENTS A SERIOUS SAFETY ISSUE. DESPITE BEING COVERED BY AN EXTENDED A MERCEDES CPO WARRANTY MERCEDES REFUSES TO COVER THE COST OF THE REPAIR. THIS IS A WELL KNOWN ISSUE ACROSS MANY MERCEDES MODELS INCLUDING THE R230 SL550. PART OF THE DOOR HANDLE ACTUATION MECHANISM IS MADE OF FRAGILE PLASTIC AND, OR NYLON THAT WEARS PREMATURELY.
Mileage: 92,000
TL* THE CONTACT OWNS A 2009 MERCEDES BENZ SL550. WHILE TRYING TO EXIT THE VEHICLE, THE DOOR HANDLE FRACTURED AND ALL OF THE DOORS AUTOMATICALLY LOCKED PREVENTING THE CONTACT FROM EXITING THE VEHICLE. THE VEHICLE WAS TAKEN TO A DEALER. THE TECHNICIAN DIAGNOSED THAT THE COMPUTER'S THEFT SYSTEM ENGAGED ONCE THE DOOR HANDLE FRACTURED AND NEEDED TO BE REPROGRAMMED. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 60,000.
Mileage: 60,000
TL* THE CONTACT OWNS A 2009 MERCEDES BENZ SL550. THE CONTACT STATED THAT THE BRAKES FAILED WHILE TRAVELING 35 MPH AND ATTEMPTING TO STOP. THE BRAKE PEDAL WAS DEPRESSED INTO THE FLOORBOARD. THE VEHICLE WAS TAKEN TO THE DEALER AND THE CONTACT WAS TOLD THAT THE HYDRAULIC BRAKE SYSTEM FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED BETWEEN 12/27/11 AND 12/28/11. THE FAILURE MILEAGE WAS 13,892 AND THE CURRENT MILEAGE IS 15,000. UPDATED 03/28/12*LJ UPDATED 04/09/12 THE CONSUMER ALSO STATED THE FRONT GRILL, BUMPER AND RETRACTABLE ROOF WERE REPLACED. UPDATED EVOQ 04/10/12 UPDATED EVOQ 05/08/12
Mileage: 13,892
TL* THE CONTACT OWNS A 2009 MERCEDES BENZ SL550. THE CONTACT STATED THAT THE BRAKES FAILED WHILE TRAVELING 35 MPH AND ATTEMPTING TO STOP. THE BRAKE PEDAL WAS DEPRESSED INTO THE FLOORBOARD. THE VEHICLE WAS TAKEN TO THE DEALER AND THE CONTACT WAS TOLD THAT THE HYDRAULIC BRAKE SYSTEM FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED BETWEEN 12/27/11 AND 12/28/11. THE FAILURE MILEAGE WAS 13,892 AND THE CURRENT MILEAGE IS 15,000. UPDATED 03/28/12*LJ UPDATED 04/09/12 THE CONSUMER ALSO STATED THE FRONT GRILL, BUMPER AND RETRACTABLE ROOF WERE REPLACED. UPDATED EVOQ 04/10/12 UPDATED EVOQ 05/08/12
Mileage: 13,892
TIRE FAILURE--BULGING/RIM DAMAGE ;REPLACING THIRD SET OF TIRES AT 8500 MILES. *TR
Mileage: 7,500
TIRE FAILURE--BULGING/RIM DAMAGE ;REPLACING THIRD SET OF TIRES AT 8500 MILES. *TR
Mileage: 7,500
PREPARING TO PUT A THIRD SET OF TIRES ON MY MERCEDES BENZ SL550 @8500 MILES. ALREADY REPAIRED 2 RIMS.?! NO WARRANTY. 3 TIRES HAVE BUBBLES ON THEM. *TR
Mileage: 7,500
PREPARING TO PUT A THIRD SET OF TIRES ON MY MERCEDES BENZ SL550 @8500 MILES. ALREADY REPAIRED 2 RIMS.?! NO WARRANTY. 3 TIRES HAVE BUBBLES ON THEM. *TR
Mileage: 7,500
AT 2595 MILES,I NEEDED TO REPLACE 3 TIRES AND REPAIR 2 RIMS ON MY 2009 MERCEDES BENZ SL550;AT 7400 MILES,ANOTHER TIRE WITH A BULGE;AT 8000 MILES,3 MORE TIRES WITH BUBBLES...AWAITING MY SERVICE APPOINTMENT;AFAID TO DRIVE AND APPREHENSIVE TO CALL THE INSURANCE COMPANY FOR FEAR OF LOSING COVERAGE.THOUSANDS OF DOLLARS OUT-NO TIRE WARRANTY AND THE DEALER SERVICE DEPARTMENT TELLS ME IT IS ME! MY CAR IS JUST TWO YEARS OLD AND HAS LESS THAN 8500 MILES ON IT.I HAVE BEEN DRIVING THIS MAKE/MODEL FOR 23 YEARS WITH NO PRIOR INCIDENT. THIS CAR WILL HAVE ITS THIRD SET OF TIRES AND MULTIPLE RIM REPAIRS AT 8500 MILES OR SO! *TR
Mileage: 2,595
AT 2595 MILES,I NEEDED TO REPLACE 3 TIRES AND REPAIR 2 RIMS ON MY 2009 MERCEDES BENZ SL550;AT 7400 MILES,ANOTHER TIRE WITH A BULGE;AT 8000 MILES,3 MORE TIRES WITH BUBBLES...AWAITING MY SERVICE APPOINTMENT;AFAID TO DRIVE AND APPREHENSIVE TO CALL THE INSURANCE COMPANY FOR FEAR OF LOSING COVERAGE.THOUSANDS OF DOLLARS OUT-NO TIRE WARRANTY AND THE DEALER SERVICE DEPARTMENT TELLS ME IT IS ME! MY CAR IS JUST TWO YEARS OLD AND HAS LESS THAN 8500 MILES ON IT.I HAVE BEEN DRIVING THIS MAKE/MODEL FOR 23 YEARS WITH NO PRIOR INCIDENT. THIS CAR WILL HAVE ITS THIRD SET OF TIRES AND MULTIPLE RIM REPAIRS AT 8500 MILES OR SO! *TR
Mileage: 2,595
UNKNOWN CAUSE, CRACKED AND BENT WHEEL RIMS, REPLACED WITH NEW. *TR
Mileage: 9,660
UNKNOWN CAUSE, CRACKED AND BENT WHEEL RIMS, REPLACED WITH NEW. *TR
Mileage: 9,660
I HAVE OWNED THIS VEHICLE SINCE MARCH 2009 AND HAVE HAD TO REPLACE 11 TIRES AND 2 WHEELS AND HAVE HAD 3 WHEELS REPAIRED. THIS IS DUE TO LOW PROFILE TIRES WHICH DEVELOP BULGES. *TR
Mileage: 1,000
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.