The contact owns a 2017 Mercedes-Benz GLC300. The contact stated that while at a stop light, the vehicle independently shifted to neutral(N) for approximately 5 minutes. The vehicle failed to release from neutral when the driver shifted the gear shifter. The contact stated that the transmission then released from neutral(N), and the vehicle jolted forward. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic, who was unable to determine the cause of the failure. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 75,000.

- Far Rockaway, NY, USA

One morning I was driving the GLC-300 about 45 mph, when suddenly the car went from 45mph to 0 in 3 seconds. The car stopped and it would not move forward. The car was towed to the Mercedes Benz dealership and it was discovered that front differential was broken. The car has 55k original miles and it's maintained very well. There was no warming light on the dashboard to indicate this problem. If the car was traveling at speed of 55 or 65 mph, it could have caused a catastrophe. This is very unusual for front differential to break. This needs to be investigated by NHTSA and I'm sure there are other customer that run into this issue. Since the car out of manufacture warranty, Mercedes Benz covered the cost of the part, but I had to pay for the labor which was a lot. The dealership admitted that it was unusual for the front differential to break specially for Mercez Benz car.

- Aldie, VA, USA

I have experienced recurrent but intermittent issues with the transmission/acceleration of my Mercedes glc 300 2017. Today, after I went up and then downhill, the car slowed dramatically on its own. When I pushed the gas pedal to the floor, the car did not respond immediately. After several seconds, the car started to accelerate. In the meantime, I was worried I would be rear-ended by traffic behind me. I have had similar problems in this same spot (which I drive nearly daily) in the past, suggesting going over the hill has something to do with it (e.g., once, in this spot, when my daughter was in the car with me, the car jerked so strongly when it started to go that my daughter though we were indeed rear ended). Although this spot most often reveals the problem, the issue has happened on flat areas as well. For instance, pulling out of a shopping center, I similarly found the accelerator non responsive. Driving my daughter to tennis one day, the car repeatedly jerked dramatically when shifting, primarily in 2nd and 3rd. Generally, the issues seem to happen most frequently in these gears. Although the transmission seems to consistently take longer to shift in these gears, the more dramatic problems do not happen daily, making it hard to trouble shoot (when I took it to my dealer, they ran their computer tests, and could not detect any problems). I am worried, though, that I will eventually be rear ended or otherwise have this problem lead to an accident. I have seen some other reports of this issue in online forums, and hope NHTSA can check into or at least track it.

- Gilberts, IL, USA