2009 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Electrical system is the leading concern among 670 owner complaints filed for this model year. This is the 2nd highest complaint count among 23 C-Class model years with reports.
Of the 2009 reports, 17 involved a crash and 19 involved a fire. 16 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints
670 reports, newest first.
Suspension, Electrical system, Air bags, Mar 14, 2023
i was driving in the highway 50 mph and i was braking and my car slipped in the other line of the highway and almost had and accident !!!! and cars switched off when driving almost had incident!!!! i saw that many people have the say problem like me about rusted component please do something because people are losing their lifes.
Structure, Feb 24, 2023
This car I have owned since brand new and I am the original owner. This car has never been used in winter despite I live in New York and always has been maintained in very good condition however, this car has developed noises from the rear when driven. I took the car to my trusted mechanic and he found out that the rear subframe has corrosion making it unsafe to drive.
Electrical system, Exterior lighting, Feb 15, 2023
While driving and when parked the headlights flicker on and off. I have no headlights while driving at night, during adverse weather conditions and during dawn hours. I could crash into other drivers, or they could crash into me because they can’t see me. When a parking bulb blows it fuses and melts everything together causing the replacement of the entire headlight unit, this has happened twice.
Structure, Feb 7, 2023
The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving at various speeds, the vehicle would sway from side to side as an abnormal clonking noise would emit from the vehicle without warning. The vehicle was taken to an independent mechanic where they discovered that the subframe had cracked due to severe corrosion. The dealer was contacted about the failure, and she was given an estimate for the repair. The manufacturer was also notified of the failure and the contact was given a case number. The vehicle had yet to be repaired. The failure mileage was 94,200.
Structure, Service brakes, Jan 5, 2023
The brake lines and subframe were completely rusted and the vehicle was unsafe to drive. Dealer confirmed at regular service appointment. I have documentation and competed all regular maintenance. Dealer would not cover costs for what appears to be a major defect. I had another shop replace the brake lines and subframe.
Other or unspecified, Structure, Dec 12, 2022
Authorized Mercedes Benz dealership in Ann Arbor, MI advised replacing tires, valve stems and other items. I dropped off the car at the dealership for the work. During Alignment they found right rear out of spec due to subframe rusted out. They said rear subframe replacement is needed. This is a very dangerous condition and Mercedes Benz does not cover rusted subframe replacement costs at all, neither do they advise routine checks for this problem which seems to be a very common issue for the C Class. In Europe and Canada, Mercedes replaces rusted subframes for free. Why is it not done for free in USA? This is a very serious issue and can cause serious and fatal accidents. The cost to replace rusted subframe is very high and car can break down while driving without any notice or warning. Additionally, there is no warning light or signal displayed to alert the driver of a potential problem. The car can have an accident without any warning light or alert.
Other or unspecified, Nov 20, 2022
At a recent VA state inspection the mechanic noted that the "rear sub-frame rusted and rear coil springs bottoms are weak." This becomes a potential suspension issue and the sub-frame should not be rusting out so quickly. Additionally, when researching online it seems prohibitively expensive to replace the rear sub-frame but this is a safety concern and I have noted that a large number of these sub-frames are being replaced..
Suspension, Nov 9, 2022
The stability control is off in the rear. No warning lights or noise. Other models of this same year make and model have been recalled for something having to do with this. Please help me our family can’t afford this rn. We have a beautiful 1 year old that needs rides to dr apt
Suspension, Structure, Wheels, Oct 17, 2022
I bought this car for my 18 year old son based on Mercedes reputation for safety and longevity, only to discover that Mercedes has a widely acknowledged issue with rotted sub-frames -- it's a serious safety issue and recalled in other countries. My son was was driving on the highway and the tire exploded. He was so close to being killed because the car went out of control. After getting it towed to my mechanic, he advised me that alignment adjusters were stuck, the subframe was rotted, the lower control arm subframe mounts were broken from the subframe and they were hitting the gas tank. Luckily, the tire only exploded as oppose to the entire vehicle bursting in flames. There were no warning lights or messages, only the feeling that the tires needed to be aligned. We bought new tires and were told an alignment was done from Town Fair Tires, which was untrue. My son's life was in immediate danger. Shame on Mercedes for not recalling this subframe. This is the first of many avenues I am taking to have this rectified and hopefully prevent a tragedy
Exterior lighting, Oct 14, 2022
The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving at an unknown speed, several unknown warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed that the connector for the rear taillights was melted into the bulk assembly mount and needed to be replaced. The contact was then informed by the dealer of NHTSA Campaign Number: 14V177000 (Exterior Lighting) however, the dealer confirmed that the recall was previously completed. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was promised a call back however, the contact had not yet received a response. The failure mileage was approximately 93,000.
Suspension, Oct 6, 2022
rear subframe rotted away and car wouldnt move
Suspension, Structure, Sep 19, 2022
The contact owns a 2009 Mercedes-Benz C300. The contact stated that while her husband was driving at an undisclosed speed, the vehicle swayed on the roadway. The vehicle was taken to an independent mechanic who diagnosed that the rear subframe was corroded and needed to be replaced. The mechanic contacted the dealer to order the replacement part and was informed by the dealer that there was a recall for the subframe; however, the VIN was not included. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 70,000.
Suspension, Other or unspecified, Sep 3, 2022
Rear subframe corrosion discovered by Mercedes Benz Service.105,000 miles on the vehicle. Presents a safety hazard, possible loss of control the vehicle. Frames rots from the inside out, which leads to discovery after vehicle performance and safety is compromised.
Steering, Suspension, Service brakes, Aug 16, 2022
Suspension Cross-Member - Mercedes-Benz (204-350-01-41) Driving regularly suddenly fill like the rear passenger side tire moved unevenly, then went to the tire shop, and when they take out the tire see how the rear frame was rusted and broken in a straight line exactly in the middle of the tire hole area. Then start to check used cars to donate that part and All of them have the same trouble in that piece, so I decided to review the frame and discover that the rust begins to damage the opposite side too, so I'm pretty sure is a component failure in metal and materials more than simple rust.
Steering, Aug 15, 2022
Steering Wheel locked due to ESL Module's motor failure making the car won't turn on, not drivable. Stuck, stranded.
Electrical system, Aug 15, 2022
The contact owns a 2009 Mercedes-Benz C300. The contact stated that the vehicle failed to start after several attempts. The vehicle was towed to an independent mechanic where it was diagnosed that the ignition switch and the steering lock had failed and needed to be replaced. The local dealer was notified of the failure and informed the contact that the parts were available. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 175,000.
Power train, Aug 10, 2022
Rear Subframe gets rusted and breaks is an issue with most of mercedes c300 to the point the part is back order in USA and Germany its a safety issue and there should be a recall for it when I called mercedes benz they told me they get at least 3 to 4 calls a day about that issue and people can't find the part it's a comment issue and it sounds be resolved.
Service brakes, Jul 18, 2022
2009 MERCEDES BENZ C300. CONSUMER WRITES IN REGARD TO PROBLEM WITH BRAKES. THE CONSUMER STATED THE MOISTURE CAUSED CORROSION IN THE BRAKE BOOSTER. THE CONSUMER REFERENCED NHTSA CAMPAIGN NUMBER 22V315. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOTIFIED, BUT DECLINED ANY ASSISTANCE STATING THE VEHICLE WAS OUT OF WARRANTY. THE CONSUMER BELIEVED THE MANUFACTURER SHOULD REIMBUREMENTS THE PAYMENT DESPITE BEING OUT OF WARRANTY.
Service brakes, Jul 14, 2022
I took my vehicle to the Mercedes dealer for inspection on 7/13/22. It passed inspection, but I was told that the brake lines were very corroded and they recommended replacement before driving. Their cost to repair was $2825. I only have 54,000 miles on the vehicle. I checked on the internet to see if there were any other reported brake line issues with a 2009 Mercedes C300 and was shocked to see how many people had the same issue, some reporting that they lost brake power and had a very terrifying experience. Of course I am now afraid to drive the vehicle and not sure what my course of action will be. With the number of reported incidents, I feel that Mercedes used inferior materials that corrode readily and should have some accountability in remedying the situation. I am including some photos of the corrosion that were provided to me by the dealer.
Structure, Jul 13, 2022
My spouse was driving approx 40MPH. Traffic light turned amber so she applied the brakes, at that point the vehicle pulled violently to the left into on coming traffic and at the same time the vehicle rear end was fish tailing out of control.Our mechanc inspected the vehicle and discovered the rear sub frame assembly had cracked on the driver side. We were advised by the mechanic this car is un driveable. Our Insurance appraiser inspected the vehicle and stated this is very common with this model vehicle and is a very bad design flaw. I contacted the Mercedes dealership and they advised there is no re-call on the subframe so I would need to pay $4000-$5000 for the repair. This vehicle is worthless to me now and is a grave safety risk to drive. I do not have the funds to fix this vehicle so I am now without a car. Mercedes customer care will not even answer any telephone calls. I have called 3 times and been on hold for over 60 minutes each time. This design flaw needs to be corrected by Mecedes before someone gets killed.
Suspension, Structure, Jul 13, 2022
The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving 70 MPH, he heard an abnormal clunking sound coming from the rear of the vehicle. The contact veered to the side of the road. After looking under the vehicle, the contact noticed that the subframe located next to the gas tank was fractured. The vehicle was taken to an independent mechanic where it was diagnosed that the rear subframe had fractured from the weld point. However, the parts to do the repair were not available. The vehicle was not repaired. The dealer was not notified of the failure. The manufacturer was notified of the failure and referred the contact to the dealer. The failure mileage was approximately 190,000.
Engine and engine cooling, Exterior lighting, Electronic stability control (ESC), Jul 11, 2022
The contact owns a 2009 Mercedes-Benz C300. The contact stated that she had experienced several electrical failures with the vehicle including the power seat and power windows, the parking brake, the exterior lighting, and the air bag warning lights. The contact also stated that the vehicle would lose motive power and stall while driving at various speeds with several unknown warning lights illuminated. The dealer was notified of the failure but offered no assistance. Upon investigation, the contact linked that failure to NHTSA Campaign Number: 22V168000 (Exterior Lighting, Electronic Stability Control, Engine and Engine Cooling). The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 120,000.
Suspension, Structure, Jul 9, 2022
Take my car to the dealer and told me my rear subframe is rusted out and is dangerous to drive. Total cost replace they said around $5800 . Why there isn’t recall for the problem in the USA ? I find out there is one in Canada and Germany for this car. What I’m supposed to do with the car? Take it to a junkyard because Mercedes’
Suspension, Jun 22, 2022
Rear subframe rusted through near connection with control arm. This left the rear wheel connected to the rest of the car only through an axle and sway bar. This is a very common issue on these vehicles, and was remedied through the replacement of the subframe.
Service brakes, Jun 8, 2022
K frame and sub frame deteriorates. There is a recall in Canada.