2010 MERCEDES-BENZ C300 Complaints

The rear subframe rusted out. This seems to be common for this vehicle. Mercedes should replace for free. It’s recalled in other countries.

The rear suspension cross member has rusted out on both sides. The rear wheels turn during braking, causing the vehicle to swerve. This is a original materials defect or design flaw.

Rear subframe corrosion hast rusted through and the subframe is no longer attached to the lower control arm car has only 56k miles this has been recalled in Canada and the issue needs to be addressed in the us it is a safety issue

Corrosion of sub frame. Vehicle is available for inspection upon request. June 7, 2022 Viti service advisor reports rust hole in sub frame. Putting the safety of myself and family members at risk. Due to corrosion deteriorating the structural integrity of the sub frame. Sub frame could break causing catastrophic accident. Loss of control, rollover, fire, puncture fuel tank, etc. This appears to be a well known defect and is recalled in Canada. Vehicle was purchased and serviced at Viti from 2010 to present. Garaged. Vehicle has not been inspected by police, insurance presentative or others. There were no warning lamps, messages or other symptoms of the problem prior to the failure.

Filled up gas and strong gas smell can be smelt throughout the car and Check engine light came on, took car to auto zone for report. Stated emissions code was listed. Was told to replace gas cap and code should clear. Replaced gas cap, still had code. Took car to shop and was told this model has this issue with this specific year and newer, and the problem could be one of 3 things. Replace gas cap, did that, replace fuel pump closing cover, did that, replace purge valve canister, did that. Check engine light still comes on and strong gas smell still exist after each fill up. Mechanic told me reach out because there was a recall on this same model a few years back...

My husband drove my car home from work on April 18th 2022 and it was a bad rain storm that everyone. He had to drive through a couple of big rain storms. Soon afterwards he got around the corner from the house and the electric system failed lights started going off everywhere in the car, he lost steering and couldn’t see and almost crashed and got the car home safely but it wouldn’t shut off so he had to disconnect the battery for the car to shut off. On April 22 nd the car was towed to the dealership because it wasn’t driveable and they check out the car and discovered water under the carpeting of the drivers seat near the wiring of the car. I submitted an insurance claim and an adjuster went out to see the damage and his thought is that it’s due to a known problem for this car that’s been reported by many people with this same vehicle. The Mercedes Benz c300- 2010-2014 years. I checked online and apparently many people have reported this same issue water underneath the car due to bad firewall manufacturered not sealed correctly which could be a manufacturers/ safety issue. My husband was almost killed thank goodness he made it home safe that night. I believe there are many people that have had this issue and someone needs to be done for safety purposes, and I believe the insurance doesn’t want to cover the repairs because they are blaming Mercedes’ Benz. My cars been in the shop a month and I still have no answer from State Farm or the shop Mercedes Benz.

I brought my car into the dealer to have my annual state required inspection, and was told by the dealer that the rear subframe had severe rot and corrosion, to an extent that they would not allow the car to pass inspection as it was hazardous to drive, and if the subframe cracked, for instance, by driving over a bump or pothole, I would endanger myself, passengers, and other cars on the road. I was stunned to find out that my Mercedes, a premium automobile, by a marquee manufacturer, which has a reputation for engineering/manufacturing excellence and had such significant corrosion. I was equally stunned because I have consistently maintained my car and done all the recommended maintenance. I asked the dealer service manager to hoist the car on a lift so I could inspect and verify the corrosion on the subframe. While I saw the significant corrosion on the subframe, all other parts of the underside of the car were in excellent shape and drive-able condition. This leads me to believe that there is a design/manufacturing flaw in the subframe. I researched this issue online and discovered that this exact Mercedes subframe has been recalled in other countries, but not in the U.S. It is a known and dangerous defect, Mercedes clearly knows it's a dangerous defect, and yet they have not recalled it. This has put me, my family, passengers and potentially other drivers at risk of serious harm and injury had the subframe broke while being driven. Additionally, it unfairly shifts the burden of repair onto the consumer rather than Mercedes for fixing a known and dangerous defect. Does a tragedy need to occur before this defective part is recalled? I hope not.

The rear sub-frame of my car has almost rusted in half. While driving on 95 I had to brake rather quickly and it felt as if the whole car was twisting. I called my mechanic the next day, drove in and put it on the lift only to find out that the sub-frame was almost detached from the car. Had this happened at 70 MPH it could have been disastrous. Mercedes knows about the design flaw but refuses to take any action.

rear sub frame rotted out and I nearly had an accident from this poor design and lack of notice from Mercedes. This should be a recall!

Driver side subframe broke in half due to rust. However, vehicle has low mileage and was very well maintained and is in mint condition throughout with no signs of rust anywhere underneath on any parts. This subframe rusted through from the inside and with no way of being able to see or catch any warning signs for owners.