Front Suspension Control Arm Problems of Mercedes Benz C300

Driving at highway speeds car felt un-stable/un-safe. When applying brakes at those speeds car felt even more un-stable/un-safe. Took the car to the local tire shop and found the driver side rear control arm broken off. 2 weeks later the passenger side control arm is also broken off. It appears the only fix is to replace the whole rear subframe. . Read more...

See all problems of the 2009 Mercedes Benz C300 🔎.

Rear subframe has rotted through. The control arm connection has come loose. No other rust on the car.

See all problems of the 2011 Mercedes Benz C300 🔎.

The rear subframe has corroded around the areas where the trailing arm and control arm meet the subframe on both sides of the vehicle, and has disintegrated around the drivers side rear trailing arm causing it to have detached, along with a piece of the subframe. The metal of the subframe is distorted around the area of the break. The detached trailing arm and piece of subframe are now making contact with the fuel tank as well. The fuel tank could have easily ruptured and ignited when this car was still in operation, as this car was driven for several days before the manufacturing defect was discovered. The failure happened when coming to a gentle stop from 20-30 miles per hour on a straight road. There was a loud snapping noise from the drivers side rear. This car had 92,000 miles at time of the structural failure and has been regularly serviced, exclusively at mercedes-benz. Mercedes-benz USA customer service is unable to offer any assistance. This exact issue has led to a recall of the same model in canada, and there are countless NHTSA reports describing similar structural failures. Mercedes-benz USA is aware of this issue and is also aware that there is a recall in canada, but has made it clear that goodwill will not be extended.

See all problems of the 2012 Mercedes Benz C300 🔎.

I was told today that my car is unsafe to drive because the subframe has rusted so severely that the control arms for both rear wheels have detached from the subframe. . Read more...

See all problems of the 2010 Mercedes Benz C300 🔎.

Rear subframe rusted from inside out causing driver side lower control arm mount to break free from subframe. Traveling approximately 40mph but proper evasive maneuvering allowed for safe stopping without incident.

Rear suspension control arm rusts off of the subframe. No other rust on the car. During braking the car steers hard to the right almost causing an accident.

Tl the contact owns a 2011 mercedes-benz C300. While driving 35 mph, the rear driver's side of the vehicle veered to the left. The contact immediately applied the brakes. The contact drove to an independent mechanic who diagnosed that the rear driver's side subframe and driver's side control arm needed to be replaced. The vehicle was repaired. The dealer was not contacted. The manufacturer was made aware of the failure and did not assist. The failure mileage was approximately 60,000.