While driving on highway, started to slowdown on exit. Vehicle rear end felt waiving side to side. Had vehicle checked with local mechanic. Reported rear subframe rusted and split. Advised not to drive & replace the subframe. Visited MB dealer service. Informed it is a known problem and a safety problem. Can repair when part is re-stock in January 2023"? $4,000 + Research online. Plenty reports in forums with same problem. Why there is not a safety recall"

- Cranston , RI, USA

August 30,2022 local Mercedes Benz dealer stated that their inspection found that the rear sub frame was rusted and needed to be replaced (estimated cost $4,699.88). I had two other independent repair shops confirm the sub frame condition.My car had 78,753 miles on it at time of discovery of sub frame corrosion condition. My independent repair shop says that OEM sub frames are back ordered with no estimate of when one would be available. Internet searches and discussion with independent repair shops indicate the rear sub frame corrosion, and structural failures, are a common problem.Structural failures are a serious safety hazard and this defect should be the subject of an NHTSA investigation and recall and replacement by Mercedes Benz. Structural suspension parts should not corrode and fail after only 78,000 miles on cars driven in normal conditions.

- Montgomery, OH, USA

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.

- College Park, MD, USA

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.

- Chelmsford, MA, USA

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).

- Avon, CT, USA

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.

- Cincinnati, OH, USA

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.

- Scarsdale, NY, USA

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!

- Elmwood Park , IL, USA

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.

- Windsor, WI, USA

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.

- Thorndale , PA, USA

So I took my car to get new tires and the tech told me that my rear subfram was rusted and cracked, unsafe to drive. I called mercedes and they asked to take it to the dealership and get a quote. I did this and there response was to do nothing.this issue has been recalled in Germany and also Canada. But nothing done in United States. This is a serious safety issue.let's say I never got my tires and never found out and was traveling 70mph down the freeway and had to hit the brakes hard for whatever reason and this part fails and breaks. Everyone in my car and whoever else my car collides into life's would most definitely be in danger

- Woodbridge, VA, USA

The driver side suspension mount to the rear subframe has rusted through. While applying the brakes the car pulled radically to the left almost causing me to lose control. This is a known issue from what I can determine but Mercedes has refused to issue a recall. The car cannot be driven until this is fixed.

- Newark, DE, USA

The item that has failed is the rear subframe of the vehicle. It is available to be viewed. It is still on my car, as it has not yet been replaced due to the cost. When braking, the front of the car will pull left and back feels like it is pulling to the right, as if you are spinning out. The problem is that the subframe is rusted out at under 100,000 miles. I just hit 100,000 and it has already broke completely. I was told by the dealership that this is a safety concern where the back of the vehicle could fall off, there words, not mine. I have been in contact with Mercedes Benz corporate and they said since I am past 50,000 miles, there is nothing they can do. There were no safety warnings, recalls or lights in the car that has given me any indication there was a problem until it broke and I felt it during breaking. This issue seems to have happened to many individuals driving the Mercedes C300, as it is not just a small number. Currently, MB has this backordered due to the number of cases. They should be responsible for a recall for the price paid for their vehicles.

- Hebron, KY, USA

Vehicle is 9 years old with 69825 miles and the Rear drivers side Subframe rusted out and broke off the vehicle. This is a common problem and is a recall in both Europe and Canada and needs to be recalled in America, this is very dangerous and life threatening as I googled and there are hundred similar stories.

- Toms River, NJ, USA

My Mercedes C300, 2013, 46,123 miles has 2 holes in rear sun frame, rendering it unsafe to drive. Dealership and MB will not acknowledge this is a common problem with this make/model. Recall for very same problem in Canada & other nations has been issued but not in USA. Dangerous situation!!! $5,200 to repair! On a premium brand auto with less than 50,000 miles. Please help!

- Washington, PA, USA

Vehicle inspection during oil change has revealed that the vehicle has a broken rear subframe. Apparently this is a common problem in Mercedes C300 vehicles, which are subject to recall for this issue in Germany and Canada. Vehicle report here (with video of broken subframe): https://xoxocar.com/inspection.aspx?inspectionid=9e225031-77b5-4304-8ec1-a10c859b90f0&print=true

- Vienna, VA, USA

Car with just 130,000 miles needs significant subframe and related parts replaced. There are countless discussion boards of similar failures across Mercedes Benz car lines. The estimated cost of repairs at the dealership exceeds $5000 just for subframe work. When braking the car veers to the left and the right end tries to swing around. Again, this is noted on multiple discussion board. MB has consistently demonstrated negligence in addressing this as service advisers state this is not uncommon and is seen often. A recall/replacement is warranted.

- Charlottesville, VA, USA

My rear sub frame is rusted and unsafe to drive.. There seems to be a recall in Canada (I think) but not in the US. this is an unsafe issue that needs to be fixed. All local repair shops are aware of these and have several that need repaired as well.

- Independence, KY, USA

2013 Mercedes Benz C300 4dr AWD. Corrosion of Rear Sub-Frame (aka "Rear Axle Carrier" or "Suspension Cross Member") (New Part #: 207-350-97-02. Old Part #: 204-350-01-41 + other numbers). Car experienced erratic behavior under all braking scenarios. Extremely dangerous behavior under heavy breaking (65 mph to 25 mph). Life threatening severity of issue. 2 personal experiences. 1: Stopping at a yellow light in a quick fashion (55-0 mph, no abs required), car pulled hard to left and almost pulled me into curbing on left hand side. It felt like the rear end was on ice and was going to do a 180 partial spin. 2: Pulling off a highway into a turning lane and braked hard to slow down for right hand turn (65-15 mph). Car pulled about 8 feet left and almost put me back into full speed traffic. Same uncontrollable "on ice" feeling. I was on a road trip and had car towed to independent mechanic in the town I was visiting. He found holes throughout rear sub-frame member on drivers side and passenger side. Mounting points for suspension components were not structurally sound. He said I was lucky the control arm didn't break loose and puncture the gas tank. Corrosion was limited to sub-frame. The rest of car was "Nearly Perfect" in the words of the mechanic. Called Mercedes Corporate and they advised towing car to local MB dealer for inspection. MB Lancaster determined car was unsafe to drive. I am currently pursuing a good will repair case that has been initially denied. Parts are back ordered for 10+ weeks. I've called several dealers to source the part and nearly dealers have orders placed to Germany for these sub frames. Repair + alignment is approximately 4k USD. In 2018, Mercedes has issued Official Service Information Supplemental Notes (SI35.00-P0009A) to technicians to look for premature corrosion issues. This is free of charge replacement in UK and Germany already and a recall in Canada. US needs to catch up quick before death occurs.

- Sterling, VA, USA

I have a 2013 Mercedes Benz C 300 sport, and I felt my car shaking if I drive above speed of 35-40. Took it to Mercedes Benz dealership is Rockville center NY, they told me it is my subframe, which cost parts $2496 and labor $3704, Total $6196. Sad part is that my car is in excellent condition and Mercedes refuse from even helping to reduce cost.

- Valley Stream, NY, USA