MERCEDES-BENZ SL550 · model year

2009 MERCEDES-BENZ SL550

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.

20
Complaints
0
Crashes
1
Fires
0
Injuries
0
Deaths

Total Complaints

20 filings

Crashes Reported

0 reports

Source

NHTSA ODI

Federal complaints database

Complaints vs. fleet median (215)

At or below the fleet median complaint volume.

Complaints by Component

ComponentCount
SERVICE BRAKES5
TIRES4
WHEELS4
ELECTRICAL SYSTEM3
TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS1
SERVICE BRAKES, HYDRAULIC1
STRUCTURE1
STRUCTURE:BODY1

Recent Complaints

20251123FireELECTRICAL SYSTEM

I'm reporting a SERIOUS SAFETY ISSUE affecting all Mercedes-Benz R230 series SL roadsters, model years 2003–2012, 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 – 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

20250213SERVICE BRAKES

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 doesn’t seem to cover my vehicle. I contacted the dealership and they said there are no open recalls.

20221202ELECTRICAL SYSTEM

This particular model 2009 Mercedes SL 550 hardtop convertible 5.5 liter motor has two batteries and accessory battery that battery that’s located in the trunk in the main starting battery that’s 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.

20220610SERVICE BRAKES

[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).

20220516SERVICE BRAKES

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

20220307SERVICE BRAKES

The brake handle popped off for parking brake

20220307SERVICE BRAKES

Catastrophic brake failure. No brakes at all.

20170117STRUCTURE:BODY

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

20150320ELECTRICAL SYSTEM

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

20120306SERVICE BRAKES, HYDRAULIC

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

20120306STRUCTURE

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

20110314WHEELS

TIRE FAILURE--BULGING/RIM DAMAGE ;REPLACING THIRD SET OF TIRES AT 8500 MILES. *TR

Mileage: 7,500

20110314TIRES

TIRE FAILURE--BULGING/RIM DAMAGE ;REPLACING THIRD SET OF TIRES AT 8500 MILES. *TR

Mileage: 7,500

20110314WHEELS

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

20110314TIRES

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

20110313WHEELS

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

20110313TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

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

20100928WHEELS

UNKNOWN CAUSE, CRACKED AND BENT WHEEL RIMS, REPLACED WITH NEW. *TR

Mileage: 9,660

20100928TIRES

UNKNOWN CAUSE, CRACKED AND BENT WHEEL RIMS, REPLACED WITH NEW. *TR

Mileage: 9,660

20100313TIRES

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

Compare 2009MERCEDES-BENZSL550 to Similar Vehicles

NHTSA Investigations

View all investigations

Frequently Asked Questions

How many complaints does the 2009 MERCEDES-BENZ SL550 have?
The 2009 MERCEDES-BENZ SL550 has 20 NHTSA complaints, 0 crashes, 1 fires, 0 injuries, and 0 deaths reported.
What are the most common problems with the 2009 MERCEDES-BENZ SL550?
The most-complained component for the 2009 MERCEDES-BENZ SL550 is SERVICE BRAKES with 5 complaints. Other frequently reported areas include TIRES and WHEELS.
Is the 2009 MERCEDES-BENZ SL550 safe to buy?
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.

Vehicle Safety Guides

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.