[Pomme]

Hello I have a 2024 GLA 4matic that I bought in Jan and I have driven only 250 miles primarily on inside roads - I’ve noticed the clunk and shift noise while braking too or coming to a stop, sometimes when I park or when I start the car from a stop. It’s annoying to continually hear the clunking or shifting noise. I also find it extremely noisy when moving from D1 to D6. Does anyone here have similar experience with a 2024 car ?

 

[Huey52]

Hello I have a 2024 GLA 4matic that I bought in Jan and I have driven only 250 miles primarily on inside roads - I’ve noticed the clunk and shift noise while braking too or coming to a stop, sometimes when I park or when I start the car from a stop. It’s annoying to continually hear the clunking or shifting noise. I also find it extremely noisy when moving from D1 to D6. Does anyone here have similar experience with a 2024 car ?

Obviously on a brand new vehicle you're well within warranty so take it to dealership service and have them do a test drive and analysis. They may have missed something in delivery-prep, such as shipping blocks (suspension related but not transmission). Or perhaps the factory didn't properly fill the transmission/differential fluid. Again, take it to service.

This thread commenced in 2015 so some very good general insight but perhaps not specific to your 2024 situation. Not sure why you posted to a thread in the first generation 2014-2019 section and not the 2020+, as the latter is a quite different 2nd generation.

 

[Pomme]

Thank you for your quick response. I have scheduled an appt with the service center. I will look for a latest thread but I couldn’t find any other 2024 GLA thread so will start a new post for 2024 GLA for general observations and hopefully new members will chime in too

 

[VitoS]

I have a CLA45 2017 with the similiar clunking noise that people were describing here. When coming to a stop (rolling), the clunk can be heard downshifting mostly from 2nd to 1st. Had diff oil changed, had adaptation done, changed the transmission oil. Finally, went to authorized MB service to check if something is wrong with the software and asked to update it. I was informed that the transmission software was the newest, but it wasn't compatible with the main computer software. It was fixed and I was assured that the issue should be solved. They also did diagnostics 2x times (when buying the car and after the recent visit) and from their point of view the transmission works ideally. Result: thumping/clunking noise can still be felt going to a full stop. Maybe not so noticeably, but it's still there. Otherwise, the gearbox works fluently (upshifting, downshifting in an aggressive manner). While reading previous stories I really started to think that maybe it's the way it should be, due to the nature of the transmission. However, it still seems weird. Maybe someone else still has tips and what to try next?

 

[Wayne]

Dual clutch transmissions are meant to be driven in a sporty manner in order for the computers to rev match and fluidly operate the clutches. If you slow down gradually often times the downshift to first can be harsh. It's a bit in the nature of the beast.

That being said, you can adapt your driving style to minimize this. Have you tried slowing down later and decelerating harder when coming to a full stop?

As with anything mechanical, some of these transmissions are smoother than others. Add in the computers attempting to mimic human inputs on the clutch pedal and a lot can happen.

But on line communication can leave a lot out. Sorry if the above is off mark.

 

[RKN GLA]

I have noticed a similar clunk when coming to a stop in D on my GLA and also in N, but the latter is much louder and can be physically felt, which I have noticed on our non-DCT GLE too.
I did the pedal reset yesterday and it has reduced/nearly eliminated any clunking in D, most unwanted transmission behaviours, and maybe 10% of the DCT's indecisiveness when picking which gear to be in.

 

[VitoS]

What is that pedal reset you ar mentioning?

 

[RKN GLA]

What is that pedal reset you ar mentioning?

Reset Transmission Adaptive Learning Pedal Travel

 

[pru415]

Hi all,

I've had my GLA 250 4Matic for a little less than a month now, and i've noticed a very subtle "clunk" noise coming from what feels like the rear of the vehicle while slowing down and coming to a complete stop. Typically it seems like it only does this the first few complete stops that I make in the car......like in the mornings when I pull out of my garage and am driving through the city to get to the interstate, when I approach red lights while slowing down, immediately before I come to a complete stop, it almost feels as if someone slightly tapped my rear fender (I thought someone did the first time I noticed it!)

Not quite sure what the issue could be and if it is related to the brakes/suspension or transmission? I have never experienced the violent jerks other GLA owners have had problems with while shifting into different gears, and I only seem to experience the subtle clunk while in drive (eco/manual/sports doesn't seem to make any difference). I can't imagine it is tranny related because it does not match up with the 2>1 downshift and I am only applying brakes, not gas.

After about 15 minutes, the clunk seems to go away. Has anybody else experienced this? I've done some research online and the issue seems to be well documented for various types of cars, but the diagnosis is always related to worn parts or after a new brake job, etc. My GLA has 5k miles on it.

I have heard the same noise in my GLA 250 2024. I’ve only had it two months, and it has just over 1000 miles on it. Have you found out anything more?

 

[Kingy123]

Ive got the same problem with my 2015 Mercedes gla220d 4matic, although the noise is becoming more consistent even once I've been driving for 1hr+. Should I be concerned that the rear diff is going or has already gone?

 

[Wayne]

Start by changing the diff oil. That has fixed the clunk for many on this Forum.

 

[GixY2K]

Start by changing the diff oil. That has fixed the clunk for many on this Forum.

Did this twice, back to back. Did nothing.

I decided to sell it. It was getting on my nerves. Great car otherwise. I'll miss it. Now I have a 2023 X3M, soon to have a JB4 so that it can have 600 at the flywheel (according to BurgerTuning )

 

[David White]

I have the same issue. I thought it might be an exhaust burp initially, but it is definitely a clunk in the first few minutes of driving. I have less than 3500 mi so far. Have not yet had it in for service.

the dealer told me it was the nature of the car. the glb250 has a manual transmission controlled by automatic shifting computer software. they don't sync up. They are waiting for a software update to try to eliminate the problem.... you are NOT alone!

 

[arthurwickson70]

My new 2025 gla250 clunks in rear cabin during shifting. Is there an update needed?

 

[Darang]

There seem to be a number of different problems people are having causing the 'clunking noise.
My understanding is it only occurs when there is a shift from power to drag felt from the rear. It seems as it the tolerances from the complex gearing combine when to power shifts from the engine driving to when the engine is braking. There is s knock type of sound, but only at very low speeds. Above was mentioned as a slack in the PTO gearing to the rear prop shaft. In the mix would be any slight out of phase dual clutch application. I can't remember when, but I have felt the same when using a farm tractor when there was a shift between the engine powering to the ending braking especially at low speed. I have a 2016 45 26K Kms.

 

[Zee]

There seem to be a number of different problems people are having causing the 'clunking noise.
My understanding is it only occurs when there is a shift from power to drag felt from the rear. It seems as it the tolerances from the complex gearing combine when to power shifts from the engine driving to when the engine is braking. There is s knock type of sound, but only at very low speeds. Above was mentioned as a slack in the PTO gearing to the rear prop shaft. In the mix would be any slight out of phase dual clutch application. I can't remember when, but I have felt the same when using a farm tractor when there was a shift between the engine powering to the ending braking especially at low speed. I have a 2016 45 26K Kms.

Yes, quite similar to a farm tractor shuttle shift.

 

[arthurwickson70]

There seem to be a number of different problems people are having causing the 'clunking noise.
My understanding is it only occurs when there is a shift from power to drag felt from the rear. It seems as it the tolerances from the complex gearing combine when to power shifts from the engine driving to when the engine is braking. There is s knock type of sound, but only at very low speeds. Above was mentioned as a slack in the PTO gearing to the rear prop shaft. In the mix would be any slight out of phase dual clutch application. I can't remember when, but I have felt the same when using a farm tractor when there was a shift between the engine powering to the ending braking especially at low speed. I have a 2016 45 26K Kms.

Definitely during downshifting and upshifting at low speeds.

 

[Daimler1998]

Servus hoffe mal das Thema ist noch aktuell. Habe zwecks des Klopfens mein Auto jetzt ein neues Heckachsdifferenzial verpassen lassen. Klopfen ist immernoch da lediglich wenn ich selbst runterschalte ist es weg.

 

[Daimler1998]

Hallo hoffe das Thema ist noch aktuell, habe zwecks des Klopfens meinen Gla jetzt ein neues Heckachsdifferenzial verpasst. Klopfen ist immernoch da lediglich wenn ich selber Schalte ist es weg.