2017 C43 Coupe - Clunking/thumping noise
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C43 2017
2017 C43 Coupe - Clunking/thumping noise
Hi guys,
First off, i’ve been on MBWORLD plenty of times previously but i just registered as a member. Hello to all!
I currently drive a C43 2017 coupe, and have a loud thumping noise coming from under the car. I’ve sent it to two mechanics and they have not been able to diagnose. The bushings, and links are all in great condition… we can’t figure out whats causing it. The noise typically occurs when turning right, or going over bumps, or even backing up. I believe its coming from the right side, between the center console and the wheel. One mechanic said he believes it may be the motor mount or transmission mount.
Any thoughts? I have attached a video for reference. You could hear the noise a lot on the first right turn.
Thank you in advance!!
First off, i’ve been on MBWORLD plenty of times previously but i just registered as a member. Hello to all!
I currently drive a C43 2017 coupe, and have a loud thumping noise coming from under the car. I’ve sent it to two mechanics and they have not been able to diagnose. The bushings, and links are all in great condition… we can’t figure out whats causing it. The noise typically occurs when turning right, or going over bumps, or even backing up. I believe its coming from the right side, between the center console and the wheel. One mechanic said he believes it may be the motor mount or transmission mount.
Any thoughts? I have attached a video for reference. You could hear the noise a lot on the first right turn.
Thank you in advance!!
MBWorld God!
Joined: Dec 2019
Posts: 32,545
Likes: 6,359
Hi guys,
First off, i’ve been on MBWORLD plenty of times previously but i just registered as a member. Hello to all!
I currently drive a C43 2017 coupe, and have a loud thumping noise coming from under the car. I’ve sent it to two mechanics and they have not been able to diagnose. The bushings, and links are all in great condition… we can’t figure out whats causing it. The noise typically occurs when turning right, or going over bumps, or even backing up. I believe its coming from the right side, between the center console and the wheel. One mechanic said he believes it may be the motor mount or transmission mount.
Any thoughts? I have attached a video for reference. You could hear the noise a lot on the first right turn.
Thank you in advance!!
First off, i’ve been on MBWORLD plenty of times previously but i just registered as a member. Hello to all!
I currently drive a C43 2017 coupe, and have a loud thumping noise coming from under the car. I’ve sent it to two mechanics and they have not been able to diagnose. The bushings, and links are all in great condition… we can’t figure out whats causing it. The noise typically occurs when turning right, or going over bumps, or even backing up. I believe its coming from the right side, between the center console and the wheel. One mechanic said he believes it may be the motor mount or transmission mount.
Any thoughts? I have attached a video for reference. You could hear the noise a lot on the first right turn.
Thank you in advance!!
As for the video, hmmm I don't see it. Could try reuploading please?
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Joined: Dec 2016
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2018 C43
Did you bring it to mb to diagnose? There few folks in w205 forum with broken steering wheel pin that might causing this. But I would expect the noise would come from the steering wheel not from center passenger side.
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C43 2017
I have not sent it to MB to diagnose yet.. afraid they'll charge a fortune. The mechanics i sent it to tested the rack and pinion. They said this wasn't the issue and it was in good condition. I don't really feel any feedback on the steering wheel.
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*
Though it seems a little loud for such a noise, my C63 S had a (much quieter) thumping/banging noise when accelerating at certain speeds/gears. I got under the car and checked all the heat-shield pieces for clearance and, where things looked close, did some "adjusting"/bending. For me, that cured the noise. If you can easily get under your car, it's worth doing such a check ... though I'd guess it's a low probability.
If you've ever watched an under-car video, you'll see that the exhaust-system piping/cats/muffler can actually move quite a bit. This would be exacerbated if a drive-train mount was wonky ... in which case you might even see visual evidence of some part coming in contact with another part (heat guard, frame, etc.). Again, worth doing an under-car inspection to look for any such contact evidence.
The other thing that I'd try to check is the shocks, as they can sometimes thump when they've failed. The ol' "bounce a corner" technique should show if a shock has failed ... but be careful, today's body panels are thin enough to be dented during such a test.
If you've ever watched an under-car video, you'll see that the exhaust-system piping/cats/muffler can actually move quite a bit. This would be exacerbated if a drive-train mount was wonky ... in which case you might even see visual evidence of some part coming in contact with another part (heat guard, frame, etc.). Again, worth doing an under-car inspection to look for any such contact evidence.
The other thing that I'd try to check is the shocks, as they can sometimes thump when they've failed. The ol' "bounce a corner" technique should show if a shock has failed ... but be careful, today's body panels are thin enough to be dented during such a test.
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C43 2017
Yep! It certainly happens more often on bumps especially when turning right onto parking lot cubs, etc. I used to have the same sound on the left side, and it turned out to be a bad sway bar... but the mechanics are saying the sway bars are fine now. Everything I've found online relates the sound to sway/bushings... it's driving me nuts hearing that noise.
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thank you!
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From: Florida
W140 S320
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W140 S320
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