2015 C Class transmission problems!
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2015 Mercedes C class 4matic
2015 C Class transmission problems!
Good afternoon everyone! I have a 2015 C Class 4matic with around 46k miles! For the past couple of months I’ve experienced some problems with the transmission, in all modes from comfort to sport plus, the car jerks really hard when I accelerate( feels like I braked and got rear ended, so vicious that my hands slipped off the steering wheel). Seems like the gears are slipping or the transmission doesn’t know what to do! After 3 trips to the service center where they couldn’t replicate the problems and software updates the problem still persists! Today I noticed that the flappy paddle mode wasn’t responsive at all and the car was going through all the gears at 1000 rpm making the car very sluggish and unresponsive, I believe it’s called “limp” mode. Some say it might be the torque converter, others say the crank shaft precision sensor but so far nothing! Also some implie it might be bad software update or low fluids in the transmission but the technicians at MB couldn’t find any problems (also there’s no warning ligh on on the dashboard, an error code). Anyone experiencing these problems???
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W205 2015
I am surprised and disappointed to know that the technician at MB dealership dont know what is wrong with a MB car. If they are not able to identify its problem who will? You should escalate the issue and get them to fix your car even if they need to seek help from the Germans.
Last edited by Andy74; Mar 29, 2020 at 10:30 AM.
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From: Westchester County, NY
‘15 C300 4M Sport, ‘20 GLC300
I am surprised and disappointed to know that the technician at MB dealership dont know what is wrong with this MB car. If they are not able to identify the problem who will? You should escalate the issue and get them to fix your car even if they to seek the help of the Germans.
Thread Starter
Junior Member
Joined: Mar 2020
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2015 Mercedes C class 4matic
I am surprised and disappointed to know that the technician at MB dealership dont know what is wrong with a MB car. If they are not able to identify its problem who will? You should escalate the issue and get them to fix your car even if they need to seek help from the Germans.
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W205 2015
Yes! It’s so annoying and disappointing ! I read some posts and did my research and drop the car at the service again. I believe and after documenting myself for a while now that it’s the Pulse Width modulator solenoid which causes the violent jerking motion when I try to accelerate! I mentioned that to the mechanics at Mercedes. I’ll keep you posted!
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2015 Mercedes C class 4matic
Update 05/27/2020
So after a week driving the car with a new valve body the problem reoccurred today, on a cold start, accelerating, the jerk is still there from 2-3 and 4-5 gear! I’m absolutely puzzled, there’s definitely something wrong with the transmission from the factory!
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W205, X253, C190, W213,
Last edited by irondad; May 27, 2020 at 06:13 PM.
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W205, X253, C190, W213,
Last edited by irondad; May 27, 2020 at 06:24 PM.
MBWorld Fanatic!
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W205 2015
Did your dealer change the valve body?
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Joined: Aug 2011
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W205, X253, C190, W213,
Also be aware that yours is not an isolated problem. Search 722.9 on MBWORLD and you'll see lots of threads on problems with that 7 speed transmission which is on most MBs from 2007-2018. I've had three cars with the 722.9 and all shifted poorly as the miles increased. One had problems similar to yours and cost me $3,300 to repair the conductor plate.
There are several class action suits that I'm aware of. I don't know if they are litigated, settled, or dismissed, though.
https://www.carcomplaints.com/news/2...-lawsuit.shtml
There are several class action suits that I'm aware of. I don't know if they are litigated, settled, or dismissed, though.
https://www.carcomplaints.com/news/2...-lawsuit.shtml
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Joined: Dec 2018
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W205 c309
Good afternoon everyone! I have a 2015 C Class 4matic with around 46k miles! For the past couple of months I’ve experienced some problems with the transmission, in all modes from comfort to sport plus, the car jerks really hard when I accelerate( feels like I braked and got rear ended, so vicious that my hands slipped off the steering wheel). Seems like the gears are slipping or the transmission doesn’t know what to do! After 3 trips to the service center where they couldn’t replicate the problems and software updates the problem still persists! Today I noticed that the flappy paddle mode wasn’t responsive at all and the car was going through all the gears at 1000 rpm making the car very sluggish and unresponsive, I believe it’s called “limp” mode. Some say it might be the torque converter, others say the crank shaft precision sensor but so far nothing! Also some implie it might be bad software update or low fluids in the transmission but the technicians at MB couldn’t find any problems (also there’s no warning ligh on on the dashboard, an error code). Anyone experiencing these problems???
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Joined: Aug 2011
Posts: 504
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W205, X253, C190, W213,
l had the exactly same issue happened. What I did was when it's happened in the early morning within 5 minutes after started ( it's happened whenever ), l called the service advisor told him then drop off the car right away, don't shutdown the engine otherwise they can't see the code. They fixed it because of the crankshaft position sensor.
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W205 c309
They didn't told me, when it's happened, I turned off and back on the engine right away and it didn't happen again and everything back to normal that's how I figured.
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2015 Mercedes C class 4matic
Update 07/19/20
Just got the car back after going into limp mode twice, took the car to the service and after scanning the car they found that the crank shaft position sensor was at fault! First error code in 4 months explaining why it was so hard to determine what was causing the jerk in the transmission! Now the car drives great, the manager of the service was very helpful, the repair and one of the service were complimentary! I got an explanation regarding how the car was affected by a faulty CPS, the fuel pump getting cut off and the transmission! Usually you’ll feel vibrations from the engine, poor performance or the car won’t start! Just wanted to let everyone know what was the answer because I know how frustrating it is to deal with these sort of problems and not getting an answer!!
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Joined: Sep 2023
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C300
Same issue here
Good afternoon everyone! I have a 2015 C Class 4matic with around 46k miles! For the past couple of months I’ve experienced some problems with the transmission, in all modes from comfort to sport plus, the car jerks really hard when I accelerate( feels like I braked and got rear ended, so vicious that my hands slipped off the steering wheel). Seems like the gears are slipping or the transmission doesn’t know what to do! After 3 trips to the service center where they couldn’t replicate the problems and software updates the problem still persists! Today I noticed that the flappy paddle mode wasn’t responsive at all and the car was going through all the gears at 1000 rpm making the car very sluggish and unresponsive, I believe it’s called “limp” mode. Some say it might be the torque converter, others say the crank shaft precision sensor but so far nothing! Also some implie it might be bad software update or low fluids in the transmission but the technicians at MB couldn’t find any problems (also there’s no warning ligh on on the dashboard, an error code). Anyone experiencing these problems???
Can you share the outcome on your issue? I have been dealing with this for the longest. Purchased in 2018 only to find out in 2023 of the real issue here and still it didn't come from MB service
NEVERMIND, I SEE THE END OF THE THREAD, THANK YOU FOR HELPING US SAVE TIME ON THIS.
Last edited by SheReady; Sep 20, 2023 at 11:59 PM. Reason: update
Newbie
Joined: Oct 2023
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2015 Mercedes C300
Just got the car back after going into limp mode twice, took the car to the service and after scanning the car they found that the crank shaft position sensor was at fault! First error code in 4 months explaining why it was so hard to determine what was causing the jerk in the transmission! Now the car drives great, the manager of the service was very helpful, the repair and one of the service were complimentary! I got an explanation regarding how the car was affected by a faulty CPS, the fuel pump getting cut off and the transmission! Usually you’ll feel vibrations from the engine, poor performance or the car won’t start! Just wanted to let everyone know what was the answer because I know how frustrating it is to deal with these sort of problems and not getting an answer!!
