RoadVitals

2005 Mercedes-Benz SLK350 Problems

Owner-reported complaints filed with NHTSA, grouped by component

Data refreshed

Owner complaintsComplaints are reports submitted to NHTSA by owners and drivers. NHTSA does not verify most reports before publishing them, and a complaint does not establish that a defect exists. Volume is influenced by how many of a vehicle were sold, how long it has been on the road, and how much attention an issue has received.
21
Latest Aug 29, 2025
Components namedHow many of our component categories appear on at least one report for this model year. One report can name several.
12
Crash or fire reportedComplaints whose submitter recorded that a crash or a fire occurred. These are the reporter's own answers on the NHTSA form, not verified findings.
3

What this page shows

Everything below is an owner-reported complaint submitted to NHTSA about the 2005 Mercedes-Benz SLK350, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.

Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.

Reports by component

Ranked by how many owner reports name each component category

  • Brakes516.7%
  • Suspension516.7%
  • Powertrain (other)413.3%
  • Engine413.3%
  • Fuel system310.0%
  • Transmission26.7%
  • Electrical26.7%
  • Visibility13.3%
  • Driver assistance13.3%
  • Exterior lighting13.3%
  • Steering13.3%
  • Body & structure13.3%

Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.

Each component in detail

What the reports in each category say, in the owners' own words

Brakes

Reports naming service brakes, the antilock braking system, brake hoses, master cylinders or the parking brake.

5
reports

From owner reports, verbatim

The contact owns a 2005 Mercedes-Benz SLK-350. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the vehicle failed to stop as intended. The contact stated that the vehicle eventually came to a rolling stop on the side of the road. 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 vehicle was not diagnosed or repaired by an independent mechanic or dealer. The dealer was made aware of the failure; however, the contact was informed that the repair was not covered under warranty. In addition, the contact stated that the vehicle was serviced a year prior for an extended warranty repair to prevent suspension corrosion. The contact stated that the dealer advised the contact not to drive the vehicle due to evidence of brake line corrosion. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 171,000.

NHTSA ID 11683949 · filed Aug 29, 2025

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) weren’t covered and since I couldn’t afford it they only repaired the subframe and left the rest hanging ! My brakes failed on the way home. No one was injured but I can’t believe they let me go home with that condition!

NHTSA ID 11608172 · filed Aug 13, 2024

Too few reports in this category for a page of its own — they appear in the full complaint list.

Suspension

Reports naming suspension components — springs, struts, shocks, control arms and related hardware.

5
reports

From owner reports, verbatim

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) weren’t covered and since I couldn’t afford it they only repaired the subframe and left the rest hanging ! My brakes failed on the way home. No one was injured but I can’t believe they let me go home with that condition!

NHTSA ID 11608172 · filed Aug 13, 2024

My vehicle has excessive rust issues that I’m 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. Such as the exhaust pipe and brake lines as well. All are corroded to a high degree up to and including complete brittle material Disintegration. Exhaust and rear brake line cost make it impossible for me to have the vehicle brought back to safely drivable conditions. I have to get to work daily or my family will not eat or have a roof but at a cost of more than what the car is even worth I have no choice but to choose and compromise my safety and those around me or food and shelter for my family. Please help.

NHTSA ID 11544770 · filed Sep 15, 2023

Too few reports in this category for a page of its own — they appear in the full complaint list.

Powertrain (other)

Powertrain reports that are not specifically the engine or transmission — driveshafts, axles, transfer cases and differentials.

4
reports

From owner reports, verbatim

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. after turning off the car and turn it back on usually reset it for a little bit. the first time, I have to replace the transmission.

NHTSA ID 11592159 · filed Jun 3, 2024

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

NHTSA ID 11548815 · filed Oct 7, 2023

Too few reports in this category for a page of its own — they appear in the full complaint list.

Engine

Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.

4
reports

From owner reports, verbatim

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. Happened to me on a highway, good thing the car still have some momentum and was able to pull to the shoulder while others cars are coming from behind.

NHTSA ID 11537700 · filed Aug 10, 2023

JUST GOT OFF THE HIGH WAY AND DRIVE ONTO A LOCAL STREET, THE CAR WOULD NOT SHIFT INTO ANY GEAR FORWARD OR REVERSE. END UP HAVING TO TOW THE CAR. LUCKILY IT DIDN'T HAPPEN WHILE I WAS AT THE HIGHWAY. *TR

NHTSA ID 10667301 · filed Dec 19, 2014

Too few reports in this category for a page of its own — they appear in the full complaint list.

Fuel system

Reports naming fuel storage or delivery — tanks, pumps, lines, injectors and fuel leaks.

3
reports

From owner reports, verbatim

THE FUEL GAUGE IS WORKING ERRATICALLY. AFTER FILLING UP WITH FUEL, GAUGE SHOWS 3/4 FULL. NEXT MORNING, SHOWS FULL. AFTER DRIVING 25 MILES INTO WORK, FUEL GAUGE SHOW 1/4 FULL. END OF THE DAY, FUEL GAUGE SHOWS 1/2 FULL OR EMPTY. THE READING CAN BE ALMOST ANYWHERE AND IS UNRELIABLE. I HAVE HAD TO RESORT TO TRACKING MILEAGE AND FILLING UP BEFORE RUNNING OUT OF FUEL. THE CAR HAS RUN OUT OF FUEL ON A FEW OCCASIONS CAUSING THE CAR TO LOSE POWER AND SPEED ON A MAJOR HIGHWAY WHICH IS VERY UNSAFE. *TR

NHTSA ID 11328196 · filed Jun 10, 2020

TL* THE CONTACT OWNS A 2005 MERCEDES BENZ SLK350. THE CONTACT STATED THAT THERE WAS A STRONG ODOR OF FUEL INSIDE THE VEHICLE. THE VEHICLE WAS TAKEN TO A DEALER, BUT WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 30,000.

NHTSA ID 10743294 · filed Jul 24, 2015

Too few reports in this category for a page of its own — they appear in the full complaint list.

Transmission

Reports naming the automatic or manual transmission, including shifting behaviour, shudder, slipping and transmission control modules.

2
reports

From owner reports, verbatim

I BOUGHT A CAR IN DECEMBER OF 2004 FROM MERCEDES BENZ AND NEVER HAD ANY PROBLEMS UNTIL A YEAR LATER. I STARTED TO GET TRANSMISSION PROBLEMS, THE CAR WOULD START JERKING WHEN I COME TO A STOP, AND THE RPM ON THE CAR WOULD GO HIGHER THAN NORMAL WHEN I STEP ON THE GAS PETAL AFTER COMING TO A COMPLETE STOP. I HAVE BROUGHT THE CAR INTO AUTOBAHN NUMEROUS OF TIMES TO TRY AND GET THIS PROBLEM FIXED, BUT THE PROBLEM KEEPS OCCURRING AND NEVER SEEMS TO BE FIXED COMPLETELY. THE FIRST TIME AROUND THEY HAD REPLACED MY TRANSMISSION, AND FIXED THE TAP THREADS ON THE NEW TRANSMISSION HOUSING, THE SECOND TIME AROUND THEY UPDATED OUR SOFTWARE AND CONTROL UNIT, AND THE THIRD TIME THEY CHECKED OUR CONTROL UNIT, INSTALLED A ELECTROHYDRAULIC CONTROL UNIT, THE FORTH TIME AROUND THEY DID A ADAPTATION PERFORM, AND CHECKED OUR OIL LEVEL, SOFTWARE, BATTERY CHARGER, AND THEN THE FIFTH TIME THEY INSTALLED A NEW ELECTROHYDRAULIC CONTROL UNIT, AND DID ANOTHER ADAPTATION PERFORM AND THAT DID NOT WORK SO THEY REPLACED OUR TRANSMISSION AGAIN, AND NOW IT'S STILL NOT FIXED. *TR

NHTSA ID 10197418 · filed Jul 25, 2007

4/3/2007. 2005 MERCEDES BENZ SLK 350. CONSUMER STATES THAT OCCASIONALLY WHEN THE VEHICLE IS IN NEUTRAL AT A STOP LIGHT IT IS EXTREMELY HARD TO GO INTO FIRST GEAR. *MC THE CONSUMER STATED HE SOMETIMES HAS TO APPLY ADDITIONAL PRESSURE ON THE STICK, AND WHEN DOING SO THE STICK GOES INTO REVERSE. THE PROBLEM HAPPENED INTERMITTENTLY, THEREFORE, THE DEALER WAS UNABLE TO DUPLICATE THE CONSUMERS COMPLAINT. A TSB HAD BEEN ISSUED FOR THE EXACT PROBLEM THE CONSUMER WAS EXPERIENCING. *JB

NHTSA ID 10186885 · filed Mar 30, 2007

Too few reports in this category for a page of its own — they appear in the full complaint list.

Electrical

Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.

2
reports

From owner reports, verbatim

THE EMERGENCY BRAKE LINE CAUGHT FIRE UNDERNEATH THE ARM REST COMPARTMENT. TRACED THE LINE BACK TO REAR TIRES AND NOTHING ELECTRICAL COULD BE SEEN TOUCHING BRAKE CABLE LINE. SO NO OBVIOUS REASON WHY CABLE WOULD IGNITE. I WAS PARKED IN CAR PORT STALL AFTER A SHORT TRIP TO A FRIENDS HOUSE.

NHTSA ID 11047045 · filed Nov 17, 2017

IGNITION SWITCHES INADVERTENTLY TURN FROM "RUN" TO "ACCESSORY" POSITION WHILE CAR IS DRIVEN AND I HAVE TO RESTART THE CAR TO KEEP GOING. I WOKE UP TO READ IN THE NEWSPAPER TODAY (2/28/2014) THAT THERE IS A RECALL ON THE GM FAULTED IGNITION DEATHS AND THE SAME EXACT PROBLEM DESCRIBED IS IN MY CAR AND STILL EXISTS IN THIS VEHICLE. I LOVE THIS CAR BUT IT SCARES ME. I TOLD THE LOCAL NEW CAR DEALERSHIP ON THIS AND THEY SAID IT WOULD COST ABOUT $2,000.00 TO FIX IT AND I SHOULD WAIT TILL IT GETS WORSE BEFORE FIXING IT. PLEASE ADVISE ON ANY HELP I CAN GET BEFORE IT IS TOO LATE.I BELIEVE YOU ARE THE RIGHT AGENCY TO HELP ME ON THIS I WILL GLADLY SURRENDER THIS CAR FOR YOUR INSPECTION.. THANK YOU. CC:MY ATTORNEY *TR

NHTSA ID 10566444 · filed Feb 28, 2014

Too few reports in this category for a page of its own — they appear in the full complaint list.

Visibility

Reports naming windshields, glass, wipers, defrosters and mirrors.

1
report

From owner reports, verbatim

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. The combination of raining weather and being on a one lane bridge and then having that spew into my face rendered me unable to see and had Me swerving almost off the bridge as the other lane had vehicles driving. I almost wrecked and was left with highly painful eyes. In truth it could have lead to death without question had I not had a towel in my passenger seat to wipe my face. I’m now terrified to drive it but have to. Please help, especially if any others are having the same issue, which seems to be the case. I could have had an accident or worse had an accident with others and off of the bridge!

NHTSA ID 11546292 · filed Sep 25, 2023

Too few reports in this category for a page of its own — they appear in the full complaint list.

Driver assistance

Reports naming forward-collision avoidance, lane keeping, back-over prevention, cruise control and related electronic driver-assistance systems.

1
report

From owner reports, verbatim

FIRST INCIDENT I WAS DRIVING DOWN A MOUNTAIN (MALIBU CANYON ROAD) AROUND 10:30PM AND THE AUTOMATIC TRANSMISSION WENT OUT OF GEAR BY ITSELF AND I HAD NO FORWARD CONTROL. THE ENGINE REVVED BUT THE TRANSMISSION WAS NOT ENGAGED. I WAS GOING DOWNHILL BUT IT TOOK ME AWHILE TO FIND A PLACE TO PULL OFF THE ROAD. THERE WAS NO CELLPHONE SERVICE IN THAT LOCATION SO I WAITED FOR A FEW MINUTES TO FLAG SOMEONE DOWN. NO ONE CAME BY SO I RESTARTED MY CAR AND WAS ABLE TO GET IT BACK INTO GEAR. THE SECOND INCIDENT MY WIFE AND I WERE DRIVING ON THE 101 FREEWAY AT APPROXIMATELY 65MPH AND THE TRANSMISSION DISENGAGED FROM DRIVE AND WENT INTO NEUTRAL WITHOUT ANY WARNING. WE NEARLY GOT REAR ENDED AND BY LUCK WERE ABLE TO COAST TO AN OFF RAMP. UPON REACHING THE BOTTOM OF THE OFF RAMP, I TURNED OFF THE ENGINE AND WAITED A MINUTE AND UPON RESTARTING THE ENGINE I WAS ABLE TO REENGAGE IT IN DRIVE. THE THIRD TIME BEFORE I DECIDED TO BRING IT TO THE MERCEDES DEALER, I WAS DRIVING IN TRAFFIC ON THOUSAND OAKS BLVD. AND EXPERIENCED THE SAME PROBLEM. I HAD TO PULL OVER INTO THE RIGHT LANE, CURB THE CAR AND SHUT OFF THE MOTOR. AFTER A FEW MINUTES I RESTARTED THE CAR AND WAS ABLE TO BUT IT BACK INTO GEAR. ALL OF THESE INCIDENTS TOOK PLACE WITHIN A 1 1/2 MONTH PERIOD AND I CANNOT TRUST THE CAR TO BE SAFE ANY LONGER WITH THIS CONDITION. *TR

NHTSA ID 10482114 · filed Oct 24, 2012

Too few reports in this category for a page of its own — they appear in the full complaint list.

Exterior lighting

Reports naming headlights, tail lights, turn signals and other exterior lighting.

1
report

From owner reports, verbatim

SIDE MARKER BULBS CONSTANTLY BURNING OUT. PURCHASED CAR IN 2012, AND EVERY ANNUAL INSPECTION NEED TO REPLACE BULBS. BUT AFTER ABOUT TWO WEEKS, THEY BURN OUT AGAIN. WAS TOLD BY MECHANIC WIRING IN LIGHT ASSEMBLY DEFECTIVE. COST TO REPLACE ASSEMBLY ESTIMATED $150 PER SIDE/$300 FOR BOTH - EXCLUDING LABOR. IF ASSEMBLY DEFECTIVE, FEEL I SHOULD NOT ABSORB COST TO REPLACE. AN OBVIOUS MERCEDES DEFECT.

NHTSA ID 11103092 · filed Jun 21, 2018

Too few reports in this category for a page of its own — they appear in the full complaint list.

Steering

Reports naming the steering system — racks, columns, power-steering assist and steering linkage.

1
report

From owner reports, verbatim

IGNITION SWITCHES INADVERTENTLY TURN FROM "RUN" TO "ACCESSORY" POSITION WHILE CAR IS DRIVEN AND I HAVE TO RESTART THE CAR TO KEEP GOING. I WOKE UP TO READ IN THE NEWSPAPER TODAY (2/28/2014) THAT THERE IS A RECALL ON THE GM FAULTED IGNITION DEATHS AND THE SAME EXACT PROBLEM DESCRIBED IS IN MY CAR AND STILL EXISTS IN THIS VEHICLE. I LOVE THIS CAR BUT IT SCARES ME. I TOLD THE LOCAL NEW CAR DEALERSHIP ON THIS AND THEY SAID IT WOULD COST ABOUT $2,000.00 TO FIX IT AND I SHOULD WAIT TILL IT GETS WORSE BEFORE FIXING IT. PLEASE ADVISE ON ANY HELP I CAN GET BEFORE IT IS TOO LATE.I BELIEVE YOU ARE THE RIGHT AGENCY TO HELP ME ON THIS I WILL GLADLY SURRENDER THIS CAR FOR YOUR INSPECTION.. THANK YOU. CC:MY ATTORNEY *TR

NHTSA ID 10566444 · filed Feb 28, 2014

Too few reports in this category for a page of its own — they appear in the full complaint list.

Body & structure

Reports naming the vehicle structure, frame, body panels, doors, hood and trim.

1
report

From owner reports, verbatim

A few days after a scheduled service visit at a local Mercedes-Benz (MB) dealer I noticed a creaking sound coming from the rear of my 2005 SLK350 that continued to get louder as time went by. I scheduled another appointment for post-inspection and I received the unfortunate news that corrosion of the subframe had resulted in a critical fracture rendering the vehicle unsafe to drive and that I was actually lucky to have not been involved in an accident from the mechanical failure. It is clear from the undercarriage photos that corrosion was localized to subframe junctions where other areas/parts in the vicinity did not experience debilitating fracture damage. I was surprised that a recently-serviced vehicle was now deemed unsafe to drive and required an entire rear subframe replacement. After some further investigation online (via forums, etc.) this appears to be a prominent issue with the R171 generation of rear subframes where corrosion protection was not applied to the steel subframe interior during manufacturing, which results in corrosion from the inside out, and thus by the time the problem is visually evident it is much too late from a life safety standpoint.

NHTSA ID 11469622 · filed Jun 16, 2022

Too few reports in this category for a page of its own — they appear in the full complaint list.

Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.

Elsewhere on this vehicle

Data sources

Data on this page last refreshed .