I needed new tires and the tire dealer reported that my subframe is rotted bilaterally. He suggested I do not invest in tires until it is replaced and to notify Mercedes as there may be a recall. This defect caused instability of the frame that secures the tires. The safety risk should go without saying. Any rotted structure that supports the car and/or secures the tires is an obvious safety risk. After reading the multiple complaints posted under -€œstructure-€ for this make and model, it appears that yes, this problem has been reproduced and confirmed by other owners and mechanics. I am presently picking up my car from the tire dealer and driving it directly to the Mercedes dealership-€¦so they will be aware and able to inspect it. There were no warnings or alerts that my subframe rotted. I do not believe this is something that could be measured with a sensor to trigger an alert electronically.

- Reading, PA, USA

I noticed that my car was pulling heavy to the left when I stop and strange noise in the rear of the car, after taking the car to the mechanic he told me that the car rear subframe on my 2013 Mercedes Benz c300 was rotted, the control arm bracket completely broke off on the left side and the right side is also cracked. it appears that this is a common issue in areas of heavy road salt usage during winter months, the dealer told me that the car has a rotted rear subframe problem and the subframe could break out in months.

- Hasbrouck Hts, NJ, USA

Sudden steering pull when braking. Mechanic found rotten left rear suspension cross member.part number 2043500141 Mechanic reports very Common issue with this model. Mercedes Benz is aware but will not repair or supply replacement parts. Note the replacement part is not available in US currently. Stuck with unsafe auto lacking support from Mercedes Benz. Some one is going to be injured / killed as the manufacturing defect shows rust failure from inside out and not detectable during routine maintenance. Hard braking pull is first indication that the defective part failed. Should this occur at highway speed the auto can flip resulting in major injury or death.

- Mahwah, NJ, USA

While driving at low speed, there was a sudden imbalance in the steering wheel and the car started to pull to the right. The problem was more exaggerated while breaking with significant fishtailing. I immediately took the vehicle to Mercedes-Benz dealership who diagnosed the problem as severely rusted subframe with corrosion and structural instability especially near the rear passenger side wheel. The car is Mercedes C300 4Matic 2013. The incident happened on November 24, 2021. Mileage is 77,000 miles. Should I have waited longer, there was a very high probability of complete breakdown of the subframe which would result in rollover posing high risk of injury and death to the driver and other people on the road.

- Jacksonville , FL, USA

The subframe rotted out causing the lower control arm bracket to detach from the frame. This has caused loss of control of the back left wheel and causes the car to shake and swerve when braking. This exact issue has led to recall in Canada. First noticed due to a squeaking and clunking sound. Later on the same day, I pressed the brakes on the highway and felt the described shaking/swerving. My mechanic has let me know that the car is now un-drivable due to the safety issue this causes. One of the rear subframe-€™s main purposes is to absorb and disperse impact. Not only have I entirely lost control of the rear left, but any crash that this could have led to could have been significantly more dangerous due to the failed subframe. As stated prior, this exact issue has led to recall in Canada and I believe that it should lead to recall in the USA as well.

- North Wales , PA, USA