[Discharge]

Around November, I posted about the noise issue that many people in this thread have been struggling with. I had my BMW checked at a service center in Korea, and initially, a leak in the shock absorber was found. I thought that was the cause, so it was replaced, but the noise persisted. Since then, I had many measures taken, including replacing the left and right suspension parts and applying soundproofing material to the interior trim, but the noise continued.

Later, I came across information in this thread that the noise improved after replacing the shock mount, so I purchased the part at my own expense and replaced it. Finally, the noise was resolved. The noise usually occurs more in cold weather, but even though the weather in Korea has been very cold these past couple of days, I haven’t heard any sound at all, so I believe the issue has been completely resolved.

In conclusion, replacing the shock mount from part number 33506889812 to 33506889267 solves the "softball in a box" noise. The total cost for both left and right parts is about $190, which is much cheaper than purchasing the entire Bilstein suspension set. I have inquired with BMW Korea whether this repair can be covered under warranty. If it is, I will share that information here.

[Discharge]

Originally Posted by Bimmerski

I have read your "Fix" and appreciate your input and solution. I am merely responding to Mr. Bockman's Q, re: higher mileage 240ix users and whether or not disengaging DSC results in a change in the condition.

My "Thump" is not super intrusive so I will likely live with it vs spending $ for the fix. I DO however want to exercise BMW and have my condition documented in the event (down the road) something more dramatic goes haywire with the rear suspension.

Regards

Replacing the shock mount from part number 33506889812 to 33506889267 solves the "softball in a box" noise. The total cost for both left and right parts is about $190, which is much cheaper than purchasing the entire Bilstein suspension set.

[Tegs200]

Originally Posted by Discharge

Replacing the shock mount from part number 33506889812 to 33506889267 solves the "softball in a box" noise. The total cost for both left and right parts is about $190, which is much cheaper than purchasing the entire Bilstein suspension set.

Thats really good news and wish i had of tried before getting the Bilstein rear shocks , i the only thing that is weird is my noise disappeared completely after fitting the rear shocks but the top plates are still original......

[Pentland]

Originally Posted by Discharge

Replacing the shock mount from part number 33506889812 to 33506889267 solves the "softball in a box" noise. The total cost for both left and right parts is about $190, which is much cheaper than purchasing the entire Bilstein suspension set.

That’s weird because the 2nd part you’ve listed isn’t for the M240i.

[Tegs200]

Originally Posted by Pentland

That’s weird because the 2nd part you’ve listed isn’t for the M240i.

Its for the m340i but apparently fits from what I've read , even though i have the bilstein fitted that work i might try them with my original shocks just to see to keep it all oem as my friend owns a bmw specialist so it would not cost to much.

[bem240i]

I went back to the service few days ago.
They changed my rear shocks and the noise is less with 80%. I can listen it sometimes yet so big chance that I will go back and try to find the solution.

[eshin]

So finally I have replaced my stock shock absorbers with B4 Bilstein 20-303334 and the noise is gone!!! I was thinking to go with B6s even but i didn't want to experiment with too many elements at once.

It's the first day after replacement so I pray 🙏 it's not going to return but man what a difference!

And I was sticking to it for like last 9 months what was causing me feeling all the time not happy by how the car is responding to me with all the noises. Now it's like a new car. 😀

Thanks Tegs200 for the hint.

Now it's time to send some emails to BMW authorities with complains....

[Tegs200]

Originally Posted by eshin

So finally I have replaced my stock shock absorbers with B4 Bilstein 20-303334 and the noise is gone!!! I was thinking to go with B6s even but i didn't want to experiment with too many elements at once.

It's the first day after replacement so I pray 🙏 it's not going to return but man what a difference!

And I was sticking to it for like last 9 months what was causing me feeling all the time not happy by how the car is responding to me with all the noises. Now it's like a new car. 😀

Thanks Tegs200 for the hint.

Now it's time to send some emails to BMW authorities with complains....

Perfect and really pleased it worked for you as well .

[inevitab1e]

Going into service on Monday for them to look at the rear suspension thump. Hopefully they get it resolved.

[bem240i]

I don’t think that the problem is with the original shock absorber because after the change proccess still I have.

I was thinking about the tower bearing or the spring moves a bit and it causes this disturbing sound.

[Tegs200]

Originally Posted by bem240i

I don’t think that the problem is with the original shock absorber because after the change proccess still I have.

I was thinking about the tower bearing or the spring moves a bit and it causes this disturbing sound.

That is because they changed them with the original Monroe shocks.

[m36]

Originally Posted by bem240i

I don’t think that the problem is with the original shock absorber because after the change proccess still I have.

I was thinking about the tower bearing or the spring moves a bit and it causes this disturbing sound.

There are people that got the "tower bearing" from a 3 series and the noise is gone, I'm still waiting on getting mine replaced by the dealer. BMW considers this the official fix from what I can tell: https://g87.bimmerpost.com/forums/sh...&postcount=509

[kyleshane12]

Hello,

New user here from Boston. I purchased a 2023 BMW M240i with 7500 miles and I hear the same "softball in a box" noise from the right rear area of the vehicle when going over bumps around 15-30mph. It seems to be more noticeable in Sport Plus mode. I took it to the dealer two weeks ago, they replaced the right rear shock telling me this was the route cause. Now it seems to be louder than before the shock replacement, so in my case it was not the rear shock. I'm thinking more of a spring issue, maybe exhaust pipe hitting something when the electric shock is tightened. This clearly has something to do with the Sport Plus mode which I believe tightens the shocks up. I will keep all you guys informed as progress is being made.

Cheers!
Steve