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Technical Topics Suspension / Chassis / Brakes M340i front left suspension clunk - 8/26 UPDATE

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      06-28-2021, 04:37 AM   #23
sirelliot
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Quote:
Originally Posted by dwj6211 View Post
Having a similar issue on my 2021 M440i. Here is my best attempt at recording the noise that's coming from the left front. Is this similar to what you all are also experiencing?

Any insight would be helpful! Have a service appointment in 2 weeks, that was the first appointment they had with a loaner vehicle available.

I had the same 'knock' on my 2019 M340i x drive. BMW UK authorised my local dealer to change the steering rack which was completed last week 23rd/24th June 2021. So far the knock has gone!
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      07-10-2021, 06:16 PM   #24
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Quote:
Originally Posted by sirelliot View Post
My October 2019 G20M340i had the same issue - (started knocking April/May 2021). Mileage was 11,000 miles and the knock came from front left side and low down (sounded the same as your video clip - a very distinctive knock!). Didn't do it on a regular basis; eventually after a spirited drive - the car was 'hot' - on returning home after 2 hours of continuous driving it knocked consistently every couple of hundred yards. My dash cameras picked up the sound and this allowed my local BMW service department to hear the noise. Dealer couldn't replicate but asked me for the dashcam MP4 files which were sent to BMW UK. Within 24 hours BMW UK responded with "change the steering rack". This was completed last week (24th June 2021) and so far after 200/250 miles the knock has gone!

Reference the video clip from dwj6211 posted 13th June2021
Do you have a job number or any paper work I have same problem bmw keep saying nothing is wrong and I want this sorted.
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      07-10-2021, 06:18 PM   #25
lconnell99
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Quote:
Originally Posted by sirelliot View Post
I had the same 'knock' on my 2019 M340i x drive. BMW UK authorised my local dealer to change the steering rack which was completed last week 23rd/24th June 2021. So far the knock has gone!

https://drive.google.com/file/d/1X2IBuiM_BqcTB99Uh4WtVOqtURP6SjU1/view?usp=drivesdk
This is what I have but bmw can't replicate it.
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      07-17-2021, 04:20 AM   #26
a.summers86
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Quote:
Originally Posted by lconnell99 View Post
https://drive.google.com/file/d/1X2IBuiM_BqcTB99Uh4WtVOqtURP6SjU1/view?usp=drivesdk
This is what I have but bmw can't replicate it.
Have you got to the bottom of this?

Donít suppose you find itís only audible when the weather is warmer?
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      07-29-2021, 04:40 AM   #27
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Quote:
Originally Posted by a.summers86 View Post
Have you got to the bottom of this?

Donít suppose you find itís only audible when the weather is warmer?
Weird you say that. Mine has been in warmer weather but only after a longer drive. After a longer drive, the knocking noise becomes way more obvious.
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      07-30-2021, 11:48 PM   #28
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Well. It's been about 90F during the day here for a few weeks. Had my L control arm replaced due to some damage. It used to clunk only at slow speeds under 15mph but now it clunks on the highway...why?!?!?!?!

Third time going back to BMW. There'd gotta be an engineer on this forum that can get to the bottom of this??
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      07-31-2021, 08:25 AM   #29
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Add me to the list. 2020 m340i, RWD, adaptive suspension. So far had the front left lower control arm replaced as part of SIB 31-01-20 (thanks to this thread). Noise doesnít seem to be as prevalent but still there, especially driving over bumps now. Part that was replaced: 31-10-6-888-855
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      08-01-2021, 06:47 PM   #30
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If the G20 steering rack has an adjustment nut then turn it clockwise an 1/8 of a turn at a time until clunk is gone.
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      08-01-2021, 10:43 PM   #31
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Quote:
Originally Posted by Encanto View Post
If the G20 steering rack has an adjustment nut then turn it clockwise an 1/8 of a turn at a time until clunk is gone.
Thanks! I'll ask my service guy tomorrow when I bring my car in.
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      08-03-2021, 10:40 AM   #32
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Took a few more drives since control arm replacement. Clunk is less prevalent for sure, but still there. Also temperature has been lower so that might be a factor, too, since I first started to hear/feel it when the heat got bad.
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      08-06-2021, 08:00 AM   #33
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Exactly the same here. Parts changed - ok until the temperature went up. Then back exactly as before.

Surely BMW are aware of this problem. My dealership alone has had 3 cars in all with the same issue.
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      08-15-2021, 06:36 PM   #34
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Hi guys, I have a BMW 320i M Sport G20 and has recently started to hear some clunking noise in the front suspension when going over bumps or some road imperfections. I have searched online and found this thread (many thanks!). Now I'm thinking about going to service and showing the car. It seems to be a warranty case and is related to either DSC software update or wishbone / tension strut replacement. Which category should I select when booking the service, 'fault diagnosis' I suppose? Most of the dealers want £200 for this but how does this correlate with the fact that it's supposed to be covered by the warranty? Any comments are welcome.
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      08-16-2021, 08:21 AM   #35
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Quote:
Originally Posted by Kevin Shawn View Post
Which category should I select when booking the service, 'fault diagnosis' I suppose? Most of the dealers want £200 for this but how does this correlate with the fact that it's supposed to be covered by the warranty? Any comments are welcome.
Surely thats for out of warranty work? I've never paid for fault diagnosis for a BMW under warranty.
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      10-06-2021, 07:13 PM   #36
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Car is in with my dealer with all the ideas from this forum and other posts about this issue. Not sure what to expect but will report back here if they can replicate and what they try to fix.
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      10-10-2021, 02:28 PM   #37
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Quote:
Originally Posted by transcendid View Post
Car is in with my dealer with all the ideas from this forum and other posts about this issue. Not sure what to expect but will report back here if they can replicate and what they try to fix.
Any luck,

Heard people talking about the inner tire rod
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      10-10-2021, 06:32 PM   #38
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Unfortunately, they've been unable to replicate the issue Going to try again tomorrow and if still nothing, will give the car back to me.
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      10-11-2021, 11:20 AM   #39
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Could not replicate. Checked tie rods, struts, control arms, bushings… say all looks fine. So the only thing I had changed was the left control arm per the TSB for this noise, which did not fix the noise (couple of months ago). Personally I think they should swap both the upper and lower control arms on all wheels, but I guess they can only do what comes back for my VIN (I.e. they won't be compensated by BMW for anything more).
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      10-11-2021, 03:35 PM   #40
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Quote:
Originally Posted by transcendid View Post
Could not replicate. Checked tie rods, struts, control arms, bushingsÖ say all looks fine. So the only thing I had changed was the left control arm per the TSB for this noise, which did not fix the noise (couple of months ago). Personally I think they should swap both the upper and lower control arms on all wheels, but I guess they can only do what comes back for my VIN (I.e. they won't be compensated by BMW for anything more).
This really sucks, had alot of people blame the tire rods. I feel your pain my car only does the rattle after doing like 200 miles which I'd struggle to reproduce. Maybe see how much it ould cost to replace them and weight it up.

Link to my issue below, is it similar ?

https://youtube.com/shorts/kKuun1SV4xk?feature=share
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      10-12-2021, 04:57 PM   #41
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I think similar noise. Is it the deeper clunk/thump noise you're hearing? I will say that after the dealer did the TSB fix by VIN, the noise became less frequent, though I don't think mine was ever quite as frequent as what I think I hear in this video. Have you had your dealer check your VIN against that TSB?
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