2019 Slight Clunk After Stop as you Press on Gas Pedal to Accelerate
 

2019 C300 Sport here. I have a slight clunk noise coming it seems anywhere from the engine to the rear axel. It only happens after driving through all the gears then coming to a complete stop and as you release the brake pedal and just as you start pressing the gas a single faint clunk occurs but no loss of power or anything just normal driving. The car feels fine and you can't feel the clunk or knock or whatever it is but it wont occur until you come back to a complete stop. Sometimes the clunk doesn't even occur, however it happens more often than not, ~ 65% of the time? Thoughts?

I think I have the exact same problem on my 2018 C205 coupe. See my threads below:
Link1
Link2

I still haven't found any solutions to this problem. Car was back to the dealer couple of times. They checked the whole rear of the car.
I have another appointment on 19.1. and I hope they find it this time.
Would not expect this from a Mercedes.
Did you also notice simmilar clunk/thump which happens exactly when passing 50km/h for the first time? It can be slightly felt on the break pedal.

Have them check the engine and transmission mount points and flex discs.

All mounts were checked and also all the bolts re-tightened. It could be something else considering it starts to happen when you first pass 50km/h.

You mentioned it starts when you go through all the gears. Check if it starts after you pass 50km/h for the first time.
I never get the take off clunk if I first do not pass 50.

Is it possible the clunk is just the auto stop/start feature kicking in? I defeat it as I hate the 'clunk' it makes when it restarts after sitting at a light.

Sport+ (and maybe sport) defeats auto stop/start automatically so it would not happen in that mode.

On one other forum I found this thump at 50 could be ESP initialization or something like it...
I've been back to the service (2. service) on saturday and they made suspension test and did not find a problem.
Have you been to the service regarding this issue?

I have two different types on my 2019 C-Coupe:

First one is a '' Click '' on the passenger side that is the activation/deactivation of distronic sensors (it appears between 50-60 kph)
Second one is a '' Clunk '' and it happens while I'm decelerating to stop and it seems the shifting from 3rd to 2nd gear.

I'm planning to schedule a date next week to bring it in.

Let us know if they find anything. I tried our services 4 times now and no success.

It's not a problem, it is the hill-start assist that holds the brakes for you momentarily after you release them when switching over to the accelerator. Do you notice it happen more often when you are facing uphill? There's your reason why.

Same here. Anywhere any time (But almost never before passing 50km/h for at least once).

It would be nice to try turning off hill assist and try again. Would dealer turn it off on request to test it out?

I have the same exact issue...although, it's more faint and is something I could live with

I must say you have better MB services then in my country. I was done in 1hour with service saying: "We don't know, It is probably one of the assistance systems, it is normal"

I was afraid they will say that. Will have to look elsewhere... it cannot be normal...

Since I read this thread I started giving it more attention....it's def more noticeable with the start/stop on than off. Seems like sort of spring releasing... maybe it's some sort of brake hold feature...

Exactly, it can't be much wrong but it is annoying as .....
I don't understand how Mercedes service cannot recognize waht is making this sound.