What 570 owners told NHTSA about the 2013 Mercedes-benz C-class Hybrid

The rear suspension frame was rusted, and the suspension rusted off the frame through normal wear and tear (no potholes, incidents, etc). Left side rusted off, Right side is on its way. Brake distance was increased and suddenly braking on the highway resulted in back of car swerving slightly, almost hit a truck that suddenly merged into my lane. This was discovered during an MD state inspection, I called 6 dealerships in the area, and all were familiar with the issue with this chassis. I got two estimates saying the same problem. This forum shows that there are many more like me, and even in the UK dealerships are doing replacement free of charge due to how widespread it is: https://www.benzworld.org/threads/w204-rear-subframes-deterioration.3048088/ The part has not been inspected by the manufacturer/police/insurance inspector. There were no warning lights or any alerts on my dash indicating this issue, I only found out bc I just so happened to need to do an MD state inspection, and I had been hearing a squeaking noise. Also, my brake distance was longer, and my car swerved a little under sudden braking on a dry sunny day.

NHTSA ODI 11489258

The contact owns a 2013 Mercedes-Benz C300. The contact stated while driving approximately 65 MPH, the vehicle started shuddering inadvertently, almost causing the contact to lose control of the steering wheel. The contact was able to veer to the side of the road. The vehicle was towed to a certified independent mechanic who diagnosed that the driver's side rear subframe was severely corroded and fractured. The vehicle was not repaired. The dealer was not notified of the failure. The manufacturer was made aware of the failure and a case was opened. The approximate failure mileage was 95,000.

NHTSA ODI 11489102

rotted subframe rear

NHTSA ODI 11488119

Rear subframe cracked; car has less than 95,000 miles and looks great. My two children of driving age were using the vehicle at the time, driving others as well. Fortunately, I happened to drive it not longer after the issue and took it to the shop immediately. They put it on the lift and saw that the rear subframe was cracked all the way through. As it turns out, it is becoming very common on this make/model--and it is nearly impossible to get a replacement. Mercedes Benz told me maybe sometime in 2023. In addition to having it inspected, I have since been in contact with several dealers and mechanics. Results are invariable: the part is in extremely high demand, Mercedes cannot fill the demand, and the wait is indefinite but long. There were no warning lamps, messages or other symptoms of the problem. In addition to the inconvenience, the car was very dangerous to drive. I am thankful that my son did not seriously injure himself or others while driving. The crack renders the car unstable at anything but the slowest speeds. When one brakes at any speed over about 20-25 mph, the car pulls violently to one side. Simply braking alone could cause a major, even fatal, accident. And any emergency maneuver could be disastrous. The car has been garaged since June awaiting a replacement that I am told will cost between $4000 and $6000! I am left with a vehicle that runs very well--but is unsafe to drive on a public roadway--and no way to repair it. Moreover, Mercedes cannot tell me when the part may become available (likely sometime in 2023).

NHTSA ODI 11486805

Rear subframe of vehicle rusted under regular use conditions and the left trailing arm mount broke off as a result. This caused vehicle braking to become extremely unstable and dangerous, even at low/medium speed. This is a known problem from this manufacturer and the Fed government should take action to force recall.

NHTSA ODI 11486195

Brought my car to the dealership because I was hearing a noise when going over bumps. Also noticed some instability when braking and driving at highway speeds. Dealer informed my my subframe had rusted and told me the car was unsafe to drive.

NHTSA ODI 11485232

The contact owns a 2013 Mercedes-Benz C300. The contact stated that while the vehicle was at the dealer for routine maintenance, the dealer informed him that the subframe was corroded and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 89,000.

NHTSA ODI 11484447

rear subframe premature rust for a 2013 car I've been reading a lot many people have same problem it is a very expensive fix and I'm sure Mercedes knows about it. Also engine makes very bad rattling noise at startup which is also a very expensive fix and Mercedes issued a tsb bulletin thank you

NHTSA ODI 11483845

The contact owns a 2013 Mercedes-Benz C300. The contact stated that while driving approximately 55 mph when they attempted to apply the brake pedal but the vehicle failed to stop and emitted a rumbling noise. The contact stated the vehicle's rear end had swerved causing them to use excessive force in order to avoid a crash. The contact was able to maneuver the vehicle to the side of the road where they waited before continuing driving. There were no warning lights. The contact took the vehicle to the dealer who diagnosed that the rear subframe on the driver's side had severe rust and needed to be replaced. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 118,000.

NHTSA ODI 11483528

The interior driver side door handle broke and I was trapped inside my vehicle. Upon checking with the local Mercedes-Benz repair shop, this is a known problem with this type of vehicle and the design of the door handle is prone to this kind of a problem. As of now, the contact has stated that their current solution for the issue is to roll down the window and open the door with the exterior handle.

NHTSA ODI 11483061

Rear subframe and rear wheel control arm separated and corroded. Car not safe to drive. 2013 model with 31,000 miles, always garaged and maintained.

NHTSA ODI 11482884

I have a 2013 MERCEDES BENZ C300 Sport 4MATIC with roughly 90k miles. Car is in great condition, a well maintained vehicle that has been regularly serviced (receipts in hand). I recently sent it in for an oil change, air filter change, and to check out a slight rear noise that started a couple weeks ago. I was told the Rear Subframe is severely rotted, and hitting the gas tank. My car is completely un-driveable until this issue is resolved, and extremely expensive to repair. I also called multiple MBUSA dealers, and was told these parts are on back order WITH NO TIME FRAME. Therefore, leaving me with no car for weeks if not months. Based on my own research this is a wide-spread manufacturing failure, which was correct in newer models to prevent the corrosion. Not only is it crazy that the US does not offer free repair / a recall on this issue like OTHER COUNTRIES - Mercedes Benz is leaving people hanging due to the back orders. Curious if Canada / other countries also have this back order issue regardless of recall status. If not, MBUSA should most definitely be responsible to all its US customers whether its improving inventory or recalling the part. My plans were to sell the vehicle for a newer model BEFORE this problem arose. If the noise didn't start until after I sold it, the new owner could have easily been injured or killed. I service this vehicle 2-3 times a year for routine maintenance, and was never made aware of the issue. If I waited to take it in any longer I could have been severely injured as well. I am now without a car, because the frame was not properly protected during manufacturing. The fact this part is on back order for 2 months says it all. Strongly appreciate your assistance in resolving this safety concern.

NHTSA ODI 11482660

THE REAR SUBFRAME ON THE CAR IS COMPLETELY RUSTED. I GET AN OIL CHANGE AND A INSPECTION OF THE CAR DONE AT THE DEALER EACH YEAR. NOBODY MENTIONED TO ME THAT THE REAR SUBFRAME IS RUSTED AND IS ABOUT TO CRACK AND FALL APART. WAS DRIVING HOME FROM WORK WHEN I SUDDENLY HAD TO STOP AND THE WHOLE CAR SHIFTED TO THE RIGHT ALMOST CAUSING ME TO CRASH. DROVE HOME AND NOTICED A NOISE EVERY TIME I HIT THE BRAKES. THE NEXT DAY TOOK IT TO A MECHANIC AND HE SHOWED ME THAT THE SUBFRAME CRACKED AND FELL APART. I KNOW THIS IS A BIG ISSUE IN EUROPE AND THE DEALERS CHANGE IT FREE OF CHARGE SINCE IT IS ON A RECALL, BUT NOTHING IN THE USA AFTER SEVERAL COMPLAINTS FROM DRIVERS. DO SOMETHING ABOUT THIS!

NHTSA ODI 11481341

Driving my 300 down the highway at around 70MPH and after lightly pressing the break, the car surved into right and left lane. I could have gotten into an accident, but luckily no other car was on the road. Taking my car to the mechanic it was discovered that My 2013 C300 has a rotted subframe, this was not caused by any damage but due to the part not being protected from rust. Rust caused the subframe to rot from the inside out. Many C300 have reported this issue, and the large number of failures on this subframe across my C300 and multiple models is concerning. This is a gross failure of a major safety component that can cause serious injury or death. My research showed this part has been recalled in Canada; MBUSA feels the need to wait to do so until a serious injury or death has occurred. The defective subframe is known and the new part’s design has been amended to take into account this rust issue. MBUSA’s decision exhibits a lack of accountability for a defective part and this issue needs to be promptly addressed for the safety of its customers.

NHTSA ODI 11481468

The contact owns a 2013 Mercedes-Benz C300. The contact stated while driving approximately 30 MPH, the steering wheel started shaking. The contact then depressed the brake pedal causing the vehicle to drift. There were no warning lights illuminated. The contact took the vehicle to the dealer who diagnosed that the rear-subframe was severely rusted causing a control link to fracture. The contact was informed that the control link and subframe needed to be replaced on the passenger’s side of the vehicle. The vehicle had not been repaired due to the parts being on backorder. The manufacturer was not made aware of the failure. The approximate failure mileage was 120,000.

NHTSA ODI 11481119

Recall

NHTSA ODI 11481291

Per the attached Repair Order 948486 dated May 13, 2020, when I brought in the car to Fletcher Jones in Newport Beach for the airbag recall, I thought both of the Takata airbags were replaced and not just the passenger airbag. In fact, Repair Bill Job A states: “Replace Driver and Front Passenger Airbag”. “No Charge” I did not notice that they only replaced the passenger airbag. I would not have known the driver’s side was not replaced if the airbag warning light did not come on. Please direct Fletcher Jones to finish this repair properly. Per the enclosed photos, my dash display now has an image of the airbag and it says “Front Left Malfunction Service Required”. I am very worried what will happen if we get into an accident. Per the highlighted text attached, on April 14, 2021, a driver reported: “Front drivers air bag malfunction light is illuminated and horn nor any controls on steering wheel work at all.” I checked the horn and the steering wheel controls on our C250 when I read this. I discovered they do not work on our car as well. This drivers report goes on to say: “…repairman states this is a common issue with this car. I believe this is a serious safety issue with this vehicle as the airbag malfunction can possibly cause serious injury to the driver and the horns inability to function prevents the driver from alerting any other drivers if they stray from lane, are backing out of parking space, or distracted at a red traffic signal.” On Repair Order 948486 Fletcher Jones tried to reset the headrest which popped open when I sat in the car and put my head against it to rest. It was not due to any accident, the car was stationary. Fletcher Jones could not reset the headrest and asked for $1200 for a new one. Clearly this is also a defect because it did not occur during an accident and the headrest should not have separated. An attached article shows the Takata airbag problems still exist as ticking time bombs. MB CEO did not reply to my letter.

NHTSA ODI 11480886

I had noticed that my car was starting to pull to the side when braking. I took it in to my authorized dealer, where I always have it serviced and maintained, and I was told that the rear sub-frame bracket was broken off at the left rear lower control arm attachment point. The rear sub-frame and left rear lower control arm needs to be replaced. I was told that the car was absolutely not safe to drive. I have always taken great care to maintain the vehicle, and it has always been stored in a garage. There were no warning signs prior to the failure, and I was very surprised to hear that the sub-frame had rusted out since there is no rust anywhere else on the vehicle.

NHTSA ODI 11479375

The components of the engine being the camshaft adjusters, timing guide, timing chain, valves and pistons that all work to deliver power are faulty and have failed literally mid-drive. I was on a busy interstate during rush hour and nearly lost control of the vehicle as it just powered out while driving at 70 mph then forcing a semi to nearly terminate myself and family. The dependability and safety is abruptly ripped out from underneath you. Without even being able to control the vehicle and it coming to an abrupt, unsafe hault. There were no warning signs. The vehicle has since been looked at and informed me that an extended warranty is in place for half of all the parts and labor above.all should be covered and for safety.my nerves are a wreck and without a way to afford an entirely new engine I am left to contend with car payments for an unsafe undrivable vehicle. Since then the dealership recognized my concerns but has since stated that without a modification to the extended warranty or it being made a recall that there is nothing that can be done.

NHTSA ODI 11478916

The frame is literally rotting from the inside out. Apparently this is a very common problem with Toyota 4 runners. This should have been recalled and fixed by Toyota like they did with the Tacoma and sequoias.

NHTSA ODI 11478690

I noticed my 2013 MB C350 was making strange noises and vibrations. I could feel the car steering in a different direction when I let go of the wheel. I took it to my service dealer and was told the subframe was severely rusted which included the suspension, struts, and even brake line. I was told the car was dangerous to drive and had to keep it at the shop for 45 days while waiting for the parts to come in. Apparently this is a "common" issue with this generation of C-class. There should be nothing common or normal about a rotting subframe after only 8 years of use. This a manufacturer's defect and the manufacturer needs to be held responsible for using inferior parts for cost cutting measures. I had to pay several thousands of dollars for an issue that shouldn't be an issue for 20+ years.

NHTSA ODI 11478705

The left rear subframe is torn and severely rusted. The left rear arm also needs to be replaced because it is essentially not connected to anything which makes the car not safe to drive. I took the car to an independent shop and was told not to drive the car any longer. I had to have the car towed to my home. I was made aware that this is a common issue In Mercedes C300 and Mercedes US has refused to issue a recall although in Canada a recall has been issued on this particular part. I was driving on the highway with my 1 yr old in the backseat when my car started to pull side to side. The car felt out of control. There were no warning indicators about this issue so I wasn’t sure what was going on. Im happy I followed my instincts and had the car looked at. I am now faced with purchasing a new car or having the car repaired for several thousand dollars. I have had the car for six years without issue and I’m told that this is a manufacturer defect.

NHTSA ODI 11477996

The contact owns a 2013 Mercedes-Benz C300. The contact stated while his wife was driving approximately 30 mph, she was depressing the brake pedal and the rear side of the vehicle shifted to the left independently, causing to impact with another vehicle. The contact stated no warning light was illuminated. The air bags did not deploy. The contact stated no one was injured nor sought medical attention. A police report was filed. The vehicle was drivable and the driver was able to continue driving to her destination. The contact took the vehicle to an independent mechanic and was informed the sub frame was corroded. The vehicle was not repaired. The contact called the local dealer and made them aware of the failure. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 50,000.

NHTSA ODI 11477297

intermittently the idle will vibrate the car and acceleration will quit and sputter. Very dangerous in many conditions. cannot drive car safely.

NHTSA ODI 11477256

I noticed my Mercedes 2013 C300 (approx 89,000 miles) was acting peculiar when braking, it basically fishtailed like i was on ice, especially at a high speed on the interstate. It was very scary. It was also making clunking noises and did not handle on curves very well. Brought it to a local garage as the nearest dealer is over an hour away. Found out the rear subframe is broken on the rear passenger side and the other side very close to breaking. Not only that, but when I called a garage that specializes in German cars, he immediately guessed it was a C Class Mercedes, and when I googled it, this issue came up repeatedly. How this has not been addressed by Mercedes is beyond me, will it take a horrendous crash? Because I was almost a statistic. No warning lamps or messages. This design flaw needs addressed immediately. And now I have no vehicle as it is UNSAFE to drive and will cost me around $3,000 to fix IF they can get the part. Sent an email to Mercedes Benz, they advised recalls and service campaigns are VIN specific and to contact NHTSA. And the email closed with "Best wishes for safe and pleasant driving."

NHTSA ODI 11475655