[Fer240]

Originally Posted by 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

It Was not your shock, is the model of the shock Monroe they use, i change mines for the blistein and problem solve. So it is the monroe shock absorber

Thats why bmw cant solve it, because they replace the shock with the same part number

[kyleshane12]

Originally Posted by Fer240

It Was not your shock, is the model of the shock Monroe they use, i change mines for the blistein and problem solve. So it is the monroe shock absorber

Thats why bmw cant solve it, because they replace the shock with the same part number

Hi,

BMW replaced the shock with the same shock model yes. However, this is only happening on the right rear, why would this only happen on the right rear shock? Makes zero sense that Monroe would replace a faulty shock with another faulty shock over a year later.

[Fer240]

Originally Posted by kyleshane12

Hi,

BMW replaced the shock with the same shock model yes. However, this is only happening on the right rear, why would this only happen on the right rear shock? Makes zero sense that Monroe would replace a faulty shock with another faulty shock over a year later.

Because is not a faulty shock, is a faulty model. U can change it 10 times and the result would be the same. Some sounds lower and other louder,

Why only the right? Dont know, but is the same problem since 2022 models, bwm hace zero interest on fixing it.

Thats why like i said, I change them for the blinstein and problem solve.

My car is 2024 and
I hate the sound that much, that i prefer to pay for the fix, that keep Waiting until bmw Want to fix it, i mean like you can see on this forum, the problem started on 2022 and we are on 2025, bmw dont want to fix it, after they change the shock and sound continues the would tell you is normal sound.

[Littlecoupe]

Originally Posted by PNTDG42

Over-sensitive consumers ruin it for people with genuine issues. People will make really dumb correlations like "every time I use my high beams, my keyfob range is cut in half the next day, can you look into that?" or other impossibly related conditions and symptoms. Or take issue with every sound as if it means the vehicle has a defect, or the car sat in the rain for a week and the rotors showed surface corrosion, so the rotors must be defective.

I have to imagine that the higher up on the luxury totem pole the brand is, the more hyper-sensitive customer experiences they have.

When you come in with a brand new car and tell them that there is a faint knocking sound from the suspension, and they drive it, but it isn't immediately clunking and clanking and banging... they probably give it all of 30 seconds before they condemn you as totally irrational or insane and stamp your ticket with the ole "COULD NOT REPRODUCE ISSUE"

When I read between the lines of your statements, I do get what you're saying. I like watching those "Customer States" videos and sometimes it's completely ridiculous what people are clueless about. I recall one video where the customer states "it sounds like a something is banging around in the trunk when I accelerate, brake, and take corners." No word of a lie, it was a watermelon in a Styrofoam cooler in the trunk. SERIOUSLY? It's those people that ruin it for everyone.

I have an issue with noises, and I fully acknowledge it's fairly unreasonable, but I usually preface that with the dealer or technician, and prefer to test drive with the tech on board so I can identify the issue I want resolved. I understand the difficulty in diagnosing a noise based on a description.

The biggest issue I have is why does/did my car have so many noises? I fixed a huge number of my issues myself by tearing apart half the interior, but was that really necessary on a 70K car? Why is it I have driven or ridden in a variety of sub 40K cars, and the vast majority had not only way fewer noises, some of them are pretty much silent. Even semi stiff riding cars. It really just taints the perspective of BMW's claim of a "luxury coupe." It is not reasonable to expect this luxury brand to have interiors largely void of obtrusive noises?

[Tegs200]

Originally Posted by Littlecoupe

When I read between the lines of your statements, I do get what you're saying. I like watching those "Customer States" videos and sometimes it's completely ridiculous what people are clueless about. I recall one video where the customer states "it sounds like a something is banging around in the trunk when I accelerate, brake, and take corners." No word of a lie, it was a watermelon in a Styrofoam cooler in the trunk. SERIOUSLY? It's those people that ruin it for everyone.

I have an issue with noises, and I fully acknowledge it's fairly unreasonable, but I usually preface that with the dealer or technician, and prefer to test drive with the tech on board so I can identify the issue I want resolved. I understand the difficulty in diagnosing a noise based on a description.

The biggest issue I have is why does/did my car have so many noises? I fixed a huge number of my issues myself by tearing apart half the interior, but was that really necessary on a 70K car? Why is it I have driven or ridden in a variety of sub 40K cars, and the vast majority had not only way fewer noises, some of them are pretty much silent. Even semi stiff riding cars. It really just taints the perspective of BMW's claim of a "luxury coupe." It is not reasonable to expect this luxury brand to have interiors largely void of obtrusive noises?

It all comes down to the fact that they now use ABS Plastics which means they will all creek and rattle at some point.

[p_li]

I haven't really seen someone posting the thump, so I recorded mine:

https://www.youtube.com/shorts/HzgFEigTkjM
It's audible first around 0:11-0:13 and then towards the end when it's clearly audible despite the passing tram

2022 M240i with adaptive suspension.
I've had the spring replaced under warranty but it didn't solve the issue at all, it's even got worse lately. Of course they said that's the way it is and they don't want to address that further.

I think of installing the spring mount from 3 Series or the Bilstein springs, but I still have 3 years of warranty left and I'm worried this might interfere with my potential future warranty claims.

[Tegs200]

Originally Posted by p_li

I haven't really seen someone posting the thump, so I recorded mine:

https://www.youtube.com/shorts/HzgFEigTkjM
It's audible first around 0:11-0:13 and then towards the end when it's clearly audible despite the passing tram

2022 M240i with adaptive suspension.
I've had the spring replaced under warranty but it didn't solve the issue at all, it's even got worse lately. Of course they said that's the way it is and they don't want to address that further.

I think of installing the spring mount from 3 Series or the Bilstein springs, but I still have 3 years of warranty left and I'm worried this might interfere with my potential future warranty claims.

Yep that's the noise , i fixed mine by replacing my 2rear Monroe shocks absorbers for the Bilstein equivalent and that fixed it , some have said by replacing the 2 rear upper plates for the m340i ones also worked , I you had the rear 2 plates done at an independent garage and it worked Bmw would be none the wiser and you would have a quiet car.

[PNTDG42]

Originally Posted by Littlecoupe

The biggest issue I have is why does/did my car have so many noises? I fixed a huge number of my issues myself by tearing apart half the interior, but was that really necessary on a 70K car? Why is it I have driven or ridden in a variety of sub 40K cars, and the vast majority had not only way fewer noises, some of them are pretty much silent. Even semi stiff riding cars. It really just taints the perspective of BMW's claim of a "luxury coupe." It is not reasonable to expect this luxury brand to have interiors largely void of obtrusive noises?

Of course this probably doesnt account for it in entirety, but there is no doubt the interior of my BMW is far more complex and has a lot more surfaces and pieces to achieve its look, than say, my Tacoma. In the BMW its layer after layer after layer to form the aesthetic. CF stacked on top of aluminum plated/wrapped plastic snapped into another rigid multicomponent piece into yet another, and so on. In my truck its just a giant foam dash pad with a couple single component snap-in console covers.

Luxury cars tend to embody "be careful what you wish for". As they add more tech and features and aesthetic details, we gain a lot more failure points and rattle points etc.

[Littlecoupe]

Originally Posted by PNTDG42

Of course this probably doesnt account for it in entirety, but there is no doubt the interior of my BMW is far more complex and has a lot more surfaces and pieces to achieve its look, than say, my Tacoma. In the BMW its layer after layer after layer to form the aesthetic. CF stacked on top of aluminum plated/wrapped plastic snapped into another rigid multicomponent piece into yet another, and so on. In my truck its just a giant foam dash pad with a couple single component snap-in console covers.

Luxury cars tend to embody "be careful what you wish for". As they add more tech and features and aesthetic details, we gain a lot more failure points and rattle points etc.

You're very right in that regard. The remaining noises I have left in my car are the door handles (very infrequent crack from expansion cycles with temperature change), and more often the plastic piece that goes from the passenger vent to the center vents. Because that is directly exposed to the hotter or colder air of the HVAC system, it cracks and ticks from thermal size changes. I've had that piece out and added padding to the vents themselves. There was nothing else I could see I could do about the two pieces of overlapping plastics for the rest of the assembly that wouldn't destroy the piece. So, yes, the design definitely plays a role. Had I been able to opt for a dash without that piece, in retrospect, I would have opted for a 1 piece design with no aesthetic accent.

Of a pleasant note, I was sure the rear quarter interior panels were all hard plastic, but when I took them out, I found they are actually "leather" wrapped. They just feel hard like plastic because there is no padding between the plastic and leather.

[kyleshane12]

Hello,

Did you replace the shock mount and shock , or just the shock?

Thanks

[Tegs200]

Originally Posted by kyleshane12

Hello,

Did you replace the shock mount and shock , or just the shock?

Thanks

I personally just changed the shocks from Monroe to Bilstein and it worked but that's before I had heard about the M340i mount option which some say also works, if you just replace the oem shocks to another set it will continue to make the noise.

[Pentland]

Originally Posted by Tegs200

if you just replace the oem shocks to another set it will continue to make the noise.

Not sure how you can say that when not all cars have this problem.

[Tegs200]

Originally Posted by Pentland

Not sure how you can say that when not all cars have this problem.

Well for the ones that have...... it will.

[Pentland]

Originally Posted by Tegs200

Well for the ones that have...... it will.

Your logic is wrong.

[Tegs200]

Originally Posted by Pentland

Your logic is wrong.

I don't really care if I'm honest, I found a fix for this threads problem and it worked , 2 others have followed with the same fix and thats all I'm worried about lol.

[bubblewrap]

[QUOTE=Tegs200;31850391]I personally just changed the shocks from Monroe to Bilstein and it worked but that's before I had heard about the M340i mount option which some say also works, if you just replace the oem shocks to another set it will continue to make the noise.


Can you elaborate on what is involved in replacing the shocks?
I got a ‘23 model with adaptive dampers.
What specific model of shocks did you use and what was the installation like?

[Tegs200]

[QUOTE=bubblewrap;31854454]

Originally Posted by Tegs200

I personally just changed the shocks from Monroe to Bilstein and it worked but that's before I had heard about the M340i mount option which some say also works, if you just replace the oem shocks to another set it will continue to make the noise.


Can you elaborate on what is involved in replacing the shocks?
I got a ‘23 model with adaptive dampers.
What specific model of shocks did you use and what was the installation like?

Hi , i bought mine from Autodoc (bilstein 20-303334) i paid a BMW Specialist i know to change them for me and its about an hour a side , as soon as we we t on the test drive afterwards the noise was gone , i think 2 other forum members have done what I've done and it also worked , I took a chance as I'd read all the threads over 2 years and no one had a fix and all roads pointed to the rear shocks so I took a chance and it payed off , I have since read the M340i upper plate has worked but I can't comment on that one.

[Littlecoupe]

I find this all interesting from an engineering perspective. We seem to have two solutions:

1) Aftermarket shock replacement
2) 3 Series upper mount replacement

The fact that either can fix the noise exclusively to me points to the possibility of the G42 upper mount and factory shock interface. The fact a mount alone can fix the noise says that it's not different shock tuning since the shock remained the same. And for a shock only replacement, this says that the mount is not exclusively the source of noise itself either. So, somehow the interface of mounting the G42 shock into the G42 mount is the combination that produces noise. When either component changes, the noise is gone. Perhaps too loose of tolerances on one or the other, and the replacement part, one or the other, fixes the tolerance issue?

I watched a video of G20 3-series shock replacement and it doesn't look like any overly complicated procedure. The shock mount appears to be the much cheaper part to source. I'd be interested in seeing if we continue to have these results, and if BMW doesn't officially fix it, we have options.

The only other piece of the puzzle is the shock cover (bellow) and the bump stop. Nobody has made mention of either specifically. I suspect these have been re-used in a few or most applications.

Again, seems interesting to me how this is playing out.

Visual for consideration:

[Tegs200]

Originally Posted by Littlecoupe

I find this all interesting from an engineering perspective. We seem to have two solutions:

1) Aftermarket shock replacement
2) 3 Series upper mount replacement

The fact that either can fix the noise exclusively to me points to the possibility of the G42 upper mount and factory shock interface. The fact a mount alone can fix the noise says that it's not different shock tuning since the shock remained the same. And for a shock only replacement, this says that the mount is not exclusively the source of noise itself either. So, somehow the interface of mounting the G42 shock into the G42 mount is the combination that produces noise. When either component changes, the noise is gone. Perhaps too loose of tolerances on one or the other, and the replacement part, one or the other, fixes the tolerance issue?

I watched a video of G20 3-series shock replacement and it doesn't look like any overly complicated procedure. The shock mount appears to be the much cheaper part to source. I'd be interested in seeing if we continue to have these results, and if BMW doesn't officially fix it, we have options.

The only other piece of the puzzle is the shock cover (bellow) and the bump stop. Nobody has made mention of either specifically. I suspect these have been re-used in a few or most applications.

Again, seems interesting to me how this is playing out.

Visual for consideration:

Exactly that , the biggest problem with the Main Dealers is that if you tell them you have found a possible fix on the forums they just brush it off and say you shouldn't believe everything on the Internet lol.