Hi all,

My car kicks when I engage reverse and somtimes when I go into Drive. I've attached a video of it happening, you can hear the kick once i go into reverse. The other sounds if from the parktronic.

Has anyone else encountered this before? W205 C220d. The gearbox has been serviced recently. This has been happening for over a year now

https://i.imgur.com/EWctK4l.mp4

 

Is this the same thing? Let the vehicle idle down: https://mbworld.org/forums/c63-c63s-...old-start.html

I observed this behaviour in both TCT, DCT and MCT transmissions.

 

Hey,

Sadly this is not the fix for me. I always let the car idle sometime before I drive off or engage any gears. My issue happens all the time when I go into R and very rarely when going into D. Happens even when the car is at optimal temperature

 

Could it be the brakes being wet (when parked the night before) and clunking from the rust? It could also be the start/stop https://mbworld.org/forums/e-class-w...g-reverse.html

 

Sadly, no.

This happens all the time, doesn't matter if the car has been turned off for a week or its at optimal temperature. I will even drive 15 kilometers, turn off the car, start it again after 2-3 minutes and engaging the R gear will make a kick. It's almost like a car is hitting you from the back. I'm not using the car's start/stop. Always turning it off

 

When was the fluid last changed again?

 

There is a known issue where the transmission fails to properly adapt to the P to D and P to R changes and the result is that you get a jolt. There's a procedure to resolve it, but I can't find the IL document anymore. I sort of had this issue initially with my C63, because I didn't put the transmission in P manually when parking, instead I just turned off the engine and let the transmission go to P on its own. That apparently caused it to not adapt properly, so then mostly after a cold start it jolted when I put it in R. Not really in D, but that's mostly because I back out of my garage, so I guess it properly adapted going from R to D.

 

Perhaps there is a parking pawl teach-in process/procedure in the XENTRY. I even see such an option on the Launch scanner as well.

Edit: Do you remember how long it took for it to adapt itself without going through the official procedure?

 

It's not the parking pawl. It has to do with how fast you are changing between P, R and D. There's a process where the transmission learns how quickly you change between those and then readies the transmission accordingly. If you change slowly it engages the gears more slowly, but if you change quickly for example if you are making a 3 point turn in a hurry it has to engage the gears quicker. That process takes some fine tuning. In my case it took about a week or two for the adaption to smooth things out after I started to explicitly put the transmission in P when parking. These days it's super smooth. The only time when it can still jolt is if I don't put the drive mode in C first before putting the transmission in P and turning off the engine. So now if I'm not already in C, my parking sequence involves putting the drive mode in C, then put the transmission in P and lastly turn off the engine. Then next time I drive the car everything engages smoothly. I'm not saying that's what it's gonna take with a regular C Class as things are much less aggressive there. The C300 loaners I've driven always engaged the gears smoothly and I drove those in S/S+ all the time, because I can't stand how sluggish they are in C.

 

Gotcha, I understand now. Time to go and adapt mines as well.