AI Damage2005 Mercedes-Benz SLK350: common problems
Owners of the 2005 Mercedes-Benz SLK350 filed 21 complaints with NHTSA, most often about powertrain and service brakes. Details by component below, with sources.
Key figures
- Owner complaints
- 21
- involving a crash
- 2
What fails most often
- 1 Powertrain 29% of all complaints
- 2 Service brakes 24% of all complaints
- 3 Suspension 24% of all complaints
- 4 Electrical system 10% of all complaints
- 5 Engine 10% of all complaints
- 6 Engine and cooling 10% of all complaints
- 7 Fuel/propulsion system 10% of all complaints
- 8 Exterior lighting 5% of all complaints
- Powertrain: 6 complaints (29% of all).
- Service brakes: 5 complaints (24% of all), 1 of them with a crash reported by the owner.
- Suspension: 5 complaints (24% of all), 1 of them with a crash reported by the owner.
- Electrical system: 2 complaints (10% of all).
- Engine: 2 complaints (10% of all).
Symptoms owners describe
How many of the 21 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) |
|---|---|---|---|
| Powertrain | 6 | 0 | 0 |
| Service brakes | 5 | 1 | 0 |
| Suspension | 5 | 1 | 0 |
| Electrical system | 2 | 0 | 0 |
| Engine | 2 | 0 | 0 |
| Engine and cooling | 2 | 1 | 0 |
| Fuel/propulsion system | 2 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Fuel system | 1 | 1 | 0 |
| Steering | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Vehicle speed control | 1 | 0 | 0 |
| Visibility | 1 | 0 | 0 |
| Other | 6 | 1 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The brake lines are rusted from the rear sub Frame that was rusted And caused an accident. They told me the sub frame was the only item covered but that they could only bolt it and not weld if and then the exhaust and brake lines (rusted too bad to describe) werenât covered and since I couldnât afford it they only…
After the first failure, the dealer replaced the fuel pump. The first failure occurred on february 24, 2009 and the second failure occurred on march 16, 2009. The vehicle has been at the body shop since march 17, 2009. The dealer and the manufacturer have elected not to speak to the contact.
In addition, the parking brake was activated; however, but failed to activate as intended. The contact stated that the low brake fluid warning light was illuminated. The contact refilled the brake fluid reservoir. The contact stated that the vehicle was almost involved in two crashes because of the failure.
the conductor plate along with its speed sensor is faulty. Luckily I just exit the highway, the transmission just stopped working, can't drive forward or reverse and when I apply gas on either D or R, just the RPM speed up as if the car is in neutral. I was stranded on the middle of the road. this happened a few time.
transmission lines popping off popped off at 60 miles per hour tensed me up it stared smoking pushed the safety hazzard lights on and was able to limp it off the highway its happened 3 times after i repaired them afraid to even drive it now.no no no
As i was driving (on a bridge) the convertible top/roof gushed and dumped an incredible amount of hydraulic fluid/oil right in my face unexpectedly! This came out of the blue. I had just raised it since it began to rain.
My vehicle has excessive rust issues that Iâm being told by the dealership will compromise my safety. There is currently an extension of warranty for only the subframe in rear, but the rust is extended beyond that and is applied to the components needed to be removed in order to replace the subframe.
improper heat treatment of the balance shaft spocket causing the balance shaft to worn out resulting in advance timing of the CAM. Mercedes acknowledges it's an known issue but don't cover cost of fixing it. Once ecu detected timing is off, it will stop the transmission from accelerating without any warning.
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 8,077 of 36,656 model years in the NHTSA data (top 22% most complained about).
On average one model year of the SLK350 has 8 complaints (8 years in the data). This year has 21, above average.
What to check before buying
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Other years of this model
Questions and answers
What are the most common problems with the 2005 Mercedes-Benz SLK350?
Owner complaints to NHTSA most often mention: powertrain, service brakes, suspension. Total complaints: 21. The most frequent symptoms in complaint texts: rust, corrosion (29%), fuel system, fuel smell (10%), smoke, burning smell, fire (10%).
How many service bulletins (TSB) were issued for the 2005 Mercedes-Benz SLK350?
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 2005 Mercedes-Benz SLK350 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 2005 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.