Dont know which category it falls. I bought this car in August 2015. In one week it would not start even. Towed to dealership and they said, the grounding screw was loose. I am so surprised that a car comes out from factory with a loose grounding issue. In the last 2 weeks, the car just stalled at the signal. All lights came up. I had the eco start/stop mode on. This happened 3 times and finally I shut the eco start/stop mode down. It is so dangerous that in heavy traffic, when people are ready to drive on change of signal, the car wont move, people are honking and frustrated and I am too. Looked online and so many people are complaining the same. The whole of dashboard lights up like when a car stalls. This is very dangerous. Anybody waiting behind you can take the pedal from the brake and smash into you. Similarly, for last 2 months, I have noticed that there is a jumping nature when you take leg of the brake at the signal. That scares me as well. From the feel of it, I feel this is primarily a software issue where the computer thinks it is in some mode when it is not or something and shuts everything down as a precautionary measure or something

- Kendall Park, NJ, USA

Collision assist inoperative dash light came on while highway driving followed by a loss of power and acceleration. Vehicle needed to be turned off and restarted to be drivable.

- Edmonds, WA, USA

Windows rattling, they said this problem is known, I took my car 4 times to get it fix but no lick. This is very bad when you are driving.

- Orlando, FL, USA

NHTSA recall #17V114 starting current limiter our mbenz C300-2015 model has been recalled and needs to be repaired. Its more than 60 days since the issue is known but the repairs are still not available. This thing can be dangerous to our life and needs to be fixed asap

- Newark, CA, USA

I was driving 580-E and merging onto I-5 S when I hit a humongous pot hole with my left font tire causing it to immediately blow out. That in-turn caused my stability tracking to engage, which caused me to slow down drastically. That caused another vehicle to near miss ramming me in the back and me side swiping another vehicle. I was driving approximately 70 mph and almost lost control of the vehicle and had to immediately pull over to a very narrow shoulder of the road with my emergency flashers blinking. To ensure the safety of the vehicle, my self and other passengers in the car, I had to drive approximately 0.5 miles to the next exit (67) to safely get my vehicle off the road to a safe location. I then called a tow truck to tow my vehicle back to santa rosa where I live to get the tire replaced and front bump repaired. I am unsure of the cause of the unsafe condition of the highway or what caused the pot hole. There were several cars stranded with damages to their vehicles as well. One person came to the same exit (food mart on patterson road) with a blown out tire as well. I have her contact information if you need to contact her.

- Santa Rosa, CA, USA

I heard a very big devastating noise while driving my 2015 Mercedes Benz-C300 on a local road in raleigh, nc at about 40 mph. Since I did not see any TPMS (tire pressure monitoring system) or any other kind of alert on the screen, I continued to drive. After driving about 2 more miles, I heard another big pop and the car became non-drivable by then. I did not feel hitting any object or going thru a pot hole. That's when I got down the car and noticed the right front tire outer wall got separated from the tire and the the tire was just flat to the ground. I could not, of course, drive further. This happened on Saturday (10/1/16) evening and it is a run-flat tire, but could not drive further and there was no spare in the car. So, I had to wait until today (10/3/16) to get it towed to the nearest Benz dealer in raleigh to get the tire replaced. It was a very frustrating half a day attending to this repair. There are a couple of issues here. (a) quality issue: Why the Continental tire tire gave away so quickly with only about 23.5K miles on the odometer, without hitting any object? (B) safety issue: This would have been a disaster if I were on a road trip with family on a national highway, especially, on a Saturday evening without a spare tire. (C). System response issue: Why mb system did not give any kind of alert in spite this major blow-out? I would hesitate to buy another car without a spare tire. I hope the NHTSA will consider seriously discouraging run-flat tires in the cars unless a spare tire is provided, until such time the run-flats are extremely safe and sturdy. Thanks.

- Raleigh, NJ, USA

Multiple incidents of 'collision prevention assist plus inoperative'. car loses all power until restarted. This happened several times, once on an interstate at 65 mph creating a dangerous situation. I had to pull over several lanes on the interstate with no power while other cars had to avoid me. I brought the car into the dealer and after a week of repairs, the same fault has occurred twice in the first 24 hours after return of vehicle. Fault occurred at 60 mph during a passing maneuver on a 2 lane road. Again, we were put in a very dangerous situation. This is an unsafe vehicle. Attached is a picture of the dashboard fault that I photographed after the car coasted to the side of the road. The car would not move until I turned it off and restarted.

- Boulder, CO, USA

While driving "collision prevention assist plus inoperative" message appears on dashboard. Car loses its ability to accelerate. Occurred twice (January 2015) on city streets forcing me to pull over to the side of the road and restart my car, the error disappears and I am able to drive normally. 4/7/16 occurred while traveling 65mph on an interstate. I lost ability to accelerate and was almost rear-ended by a semi-truck. The vehicle was serviced at a Mercedes dealership on 1/11/16 the highway incident occurred after the "fix". it is currently back at the dealership being tested by the service department. I am told the current fix is to replace all the senors. I have opened a case with mbusa to repurchase the vehicle given the initial repair did not work and put me in perilous highway situation. I purchased the vehicle in October of 2015.

- Canonsburg, PA, USA

Two issues, purchased a certified pre owned vehicle. At 8900 miles, we noticed the car was idling very rough on a cold start, almost the sound of a diesel. The sound would resolve after 10 minutes of driving. Service informed us that there was a recall on the rods and pistons. We had the engine rebuilt, and the noise is the same, if not worse. The car sounds nothing like laterbuild '15 models or '16 models, nor does it run as smoothly. Secondly, 5 occurrences involved inoperative collision prevention assist warnings and inoperative anti-skid warnings appearing on the dash causing the car to reduce operating speed to 20mph max. Car needed to be shut off and restarted after a 5 minute period each time these warnings appeared, in order to drive over 20mph. The vehicle was serviced for these warnings twice. The first service diagnosed the car with a coding issue. The second, involved replacing modules. This all occurred during the two months of owning the car. We notices several similar complaints regarding the early build 2015 C300S, and decided to cut our losses and purchase another vehicle. We did not feel safe in that car.

- Watertown, CT, USA

Collision prevention assistance feature went on automatically ( as well as check-engine light) while driving at highway speed in normal weather. I was not in an accident, near another vehicle and completely aware and driving normally prior to this occurring. I had to struggle with car to pull over to shoulder, loss power from gas pedal, car hard to control. I had to turn off the car, deactivate the function to drive. It happened again when I drove the car later that day after the car had been parked for a while. Took it into service. They were able to find the error code.they found that Mercedes sent out a memo in Sept. 2015 stating they are aware of the problem but service is not to do anything to "fix" it! I have only owned this car for 6 weeks, bought it new and have less than 6,000 miles on it. Mercedes is not offering a solution but more of a wait and see attitude.

- Owings Mills, MD, USA

I had two issues within 2 months of buying the car earlier in this. I purchased the car in early Feb 2015. I heard a loud sound in the heating unit, then a small clicking sound ensued for over a week. Brought it in, the motor had blown, so they replaced it without a dime out of my pocket. Then in March, I was driving about 35 miles per hour when a very loud noise like bad breaks started and wouldn't stop no matter what I did. We towed it using Mercedes, but had to pay for an uber to the dealership. It was again another malfunction with the new model, and they fixed the breaks and rotors that same day without a dime out of my pocket. I now have 6500 miles on it since I got it in Feb this year, and the check engine light came on. I tried to replace the fuel cap but that didn't make it go away and the car is driving fine. Im bringing it in later this week. I saw reports that there are some cars with this fuel issue thats causing this indicator. Overall this one particular car I leased is a total dud, but I hope these reports help others with similar issues.

- Springfield, NJ, USA