Problem Description and Possible Solution
Vehicles equipped with a 7-speed automatic transmission may develop a rough shifting condition, most commonly going up from first to second gear and going down from third to second or second to first gear. Our technicians tell us this is due to an internal component failure. Mercedes has released updated parts; the transmission will need to be removed and disassembled to complete the necessary repairs.
Average mileage: 58,923 (28,000–120,000)
20 people reported this problem
Very hard shifting from second to first going up hill. It felt as though the transmission was going to drop out of the car. The following day when we picked it up they said they were unable to duplicate the problem. I asked where you tested it, they said around the dealership. I said it happened on step roads in the mountains. They kept it for another day as one of the Techs would drive it home. Well the next day we were told the problem still could not be duplicated, but they got a program change from the factory that same day, right. It seems like it's better, but we only driven it 1,450 miles in the last seven months. The car has not seen the mountains since than.
I truthfully do not trust the Mercedes Dealer Services.
We've had problems's with the AC and the drivers window. As they cannot duplicate the problem they will not replace the inner workings to please a customer.
We have totally had it with the lack of care from these people and that of people at Mercedes Customer Service.
This vehicle shifted rough. We opened up the transmission valve body and cleaned the screens of the solenoid valves, replace the fluid with genuine fluid only, cleaned the pan and magnets, and cleared the adaptations per TSB recommendation. The transmission shifted much better after service.
After many miles of transmission problems, it finally failed and solenoids were replaced for $1100. Three months later, the transmission failed again due to clutch plate and other parts. This time, a new transmission was the answer. Thankfully, I have an extended warranty. At 75000 mikes, I'm over $10,000 in for repairs. Ridiculous and inexcusable.
The transmission is not downshifting properly, causing the car to vibrate hard while driving....the vibration is similar to the vibration received when you drift out of your lane when using the lane assist function. I thought it was the transfer case oil that needed to be replaced, but the MB dealer replaced it and told me to drive it for another month....then bring it back to have the torque converter replaced if I continued to have the problem. The torque converter has not yet been replaced, but I do still have the problem.