2011 MERCEDES-BENZ C300 Complaints

Took my 2011 C300 4matic to a local mechanic after I noticed a dramatic pulling sensation to the left after braking. After mechanic's inspection, I was informed that the rear subframe was rotted out and that the vehicle is unsafe to drive. I still have the car available for inspection of the rear subframe. The rear subframe caused the pull to the side under braking, which alone could cause an accident. Since it also connects the suspension to the frame of the car, at any point a critical suspension component could break off from the subframe, likely causing total loss of control of the car and potentially an accident. I also took the car to a Mercedes-Benz dealership where they confirmed that the rear subframe would need to be replaced and that the car was not safe to drive. I contacted Mercedes-Benz corporate, but received no support. I was only informed that they are aware of this issue, but they will not assist in any way since there is no recall issued. I provided them with copies of the quote from the dealership.

Electronic steering locks are failing in these cars at an alarming rate. When it fails, the car will be stranded or if driving the car will completely lock the steering and take away control from the driver. This is a safety issue that Mercedes should be recalling and fixing because it will take people's lives away. Mercedes is aware of this issue but is failing to recall it and considering it as non-safety. When manufacturing the Electronic Steering lock, Mercedes used cheap parts that are prone to failure. This issue affected many years and models of their cars but only recalled a few cars. Once failure occurs, the car will not start and it will be required to tow it to a dealership where repairs over $2000 will be needed to fix this SAFETY issue.

The contact owns a 2011 Mercedes-Benz C300. The contact stated while driving at approximately 55 MPH and slowing for traffic, the rear end of the vehicle started to drift to the right. The contact heard an abnormal sound coming from the rear driver’s side of the vehicle. The contact stated no warning light was illuminated. The contact had driven the vehicle to a local dealer, where it was diagnosed and determined that the entire rear subframe needed to be replaced due to extensive corrosion. The vehicle had not been repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 85,000.

My 2011 c300 has a rotted rear subframe making the car not able to be driven. It has major ,life threatening, costly damage and this issue already has a recall all over the world but not in the United States.

The contact owns a 2011 Mercedes-Benz C300. The contact stated when he started the vehicle, the driver side taillights were inoperable, and the taillight warning light was illuminated. The contact examined the taillights and noticed that the wires were melted, and the taillight assembly had melted as well. The dealer was contacted and stated that the vehicle was serviced under NHTSA Campaign Number: 14V177000 (Exterior Lighting). The contact received no additional assistance. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was 90,000.

Rear sub frame and suspension welds have cracks and are broken a loose which when having to put on brakes suddenly cause car to servely pull and twist which can cause a bad accident or worse.

Subframe rots prematurely. Known issue to Mercedes Benz and has been recalled and covered in both Germany and Canada.

The contact owns a 2011 Mercedes-Benz C300. The contact stated while driving approximately 60 MPH, the brake pedal was depressed, and the rear end of the vehicle pushed out. The contact looked underneath the vehicle and noticed that the subframe was rusted. The vehicle was taken to an independent mechanic who informed the contact that the control arm had detached. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was contacted but no additional assistance was provided. The failure mileage was approximately 105,000.

Due to apparently deficient sunroof water drain system design, rainwater and condensation entered the passenger compartment under the carpeting, potentially damaging the vehicle's electrical wiring. The vehicle is available for inspection upon request. A dealer has inspected and confirmed the damage. Initial symptoms of the problem were wet carpeting and the sound of water sloshing around under the floor of the passenger compartment.

The control arm is currently freely hanging. The reverse subframe rusted out where the control arm connects to it causing severe swaying when braking.