AI Damage2008 Mercedes-Benz SL 550: common problems
Owners of the 2008 Mercedes-Benz SL 550 filed 4 complaints with NHTSA, most often about service brakes and engine and cooling. Details by component below, with sources.
Key figures
- Owner complaints
- 4
What fails most often
- 1 Service brakes 50% of all complaints
- 2 Engine and cooling 25% of all complaints
- 3 Seats 25% of all complaints
- 4 Steering 25% of all complaints
- Service brakes: 2 complaints (50% of all).
- Engine and cooling: 1 complaints (25% of all).
- Seats: 1 complaints (25% of all).
- Steering: 1 complaints (25% of all).
Symptoms owners describe
How many of the 4 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) |
|---|---|---|---|
| Service brakes | 2 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Seats | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
While driving at 50mph, audible and visual warnings of brake failure. No braking available other than transmission downshift for engine braking.
At first the brakes and steering seem normal but after about 10 seconds, again the brakes and steering failed. At this point a tow truck was called and the vehicle was towed to a local mechanic. The car was inspected and the failure was repeated. The shop inspected the car and diagnosed the car with a computer.
A fire was avoided due to a fuse causing the motor to stop however the motor while it was operating and prior to the fuse kicking in nearly caused a fire. The seat should be equipped with a contact mechanism ( similar to that in the window and elevator doors or garage doors which causes the seat to stop upon contact.
The contact was driving approximately 40 mph when the vehicle stalled without warning. The vehicle would not restart and was towed to an authorized dealer where the computer system was repaired. Approximately two years later, the recurred whether the vehicle was in motion or stopped.
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 15,521 of 36,656 model years in the NHTSA data (top 42% most complained about).
On average one model year of the SL 550 has 5 complaints (13 years in the data). This year has 4, below average.
What to check before buying
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Seats. Occupant sensor, power adjustment, seat mounts.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
Other years of this model
Questions and answers
What are the most common problems with the 2008 Mercedes-Benz SL 550?
Owner complaints to NHTSA most often mention: service brakes, engine and cooling, seats. Total complaints: 4. The most frequent symptoms in complaint texts: brake failure (25%), smoke, burning smell, fire (25%), stalls while driving (25%).
How many service bulletins (TSB) were issued for the 2008 Mercedes-Benz SL 550?
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 2008 Mercedes-Benz SL 550 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 2008 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 2026-11-05.