Help: MG ZS EV Cabin Noise

[potatosan]

Hi everyone, I drive a 2021 MG ZS EV Deluxe.

Recently I have noticed that the car has a low frequency buffering/vibration noise that really made an almost vibrating noise in my ears.

To be honest it’s hard to describe, but it seems similar to the sound wind buffering makes when the window is slightly down.

It’s bassy, and it gets worse when I go over bumps and humps and rocky roads (which is basically everywhere at this point).

Here are what I’ve done to try to overcome it, none of which have worked:
1. Sound proofed door using Dynamats
2. Sound proofed boot using STP Noise block

Before I sink anymore time, money and heartbreak into this I wanted to hear if anyone else had suffered from a similar situation, and how did you overcome it. Thank you for your time!

 

[Robf]

Have you checked the tire pressures? Mine gets a bit rumbly when they are on the low side?

 

[fred12345]

Can you figure out where it's coming from? Sunroof? At what speed it starts and stops?

 

[rcworcs]

Check the undertray(s), wheel arch covers are not loose. they can sometimes flap in the wind and create the buffering noise. I dont have the noise on mine.

 

[Tim Green]

I have not heard such a noise, is it speed related?
I would suggest having a look underneath as damaged undertrays do make a noise like that.

 

[JohnV6]

I'd check underneath & things like the motor cover or other trim is no loose.

 

[potatosan]

Have you checked the tire pressures? Mine gets a bit rumbly when they are on the low side?

All currently sitting at 260-264 kpa, I think that’s the standard setting~

Can you figure out where it's coming from? Sunroof? At what speed it starts and stops?

It’s constantly there, seems to be coming from the back of the car. Not sure where exactly because the whole thing is reverberating like crazy

Check the undertray(s), wheel arch covers are not loose. they can sometimes flap in the wind and create the buffering noise. I dont have the noise on mine.

Ok I’ll give this a look. The sound often appears on the descent of a bump/hump. I suspect it could be the hatch of the boot as well, will give these things a check and report back bere

Ok I’ll give this a look. The sound often appears on the descent of a bump/hump. I suspect it could be the hatch of the boot as well, will give these things a check and report back bere

Have tried the above
Adjusting the boot stoppers have somewhat reduced the sound by a little, but it’s still very much there.
Reducing tyre pressure to 220kpa has further reduced it by 10%
Really at a loss

 

[BOB353]

If you suspect it is air coming through door seals, try taping the up with tape.

Do the same with the boot & sunroof.

Doing one at a time will help finding which one is causing it.

 

[potatosan]

IT’S SOLVED!
I tried to put a cloth between the boot hatch and the car when it closes. 100% sound eliminated.. now the question is how do I solve this without triggering a ‘boot not closed’ warning

 

[decrep]

Sounds like the boot isn't closing properly.
Is there any adjustment on the hinges??
If the hinge bolts have come a little loose it could be out of alignment.

 

[potatosan]

Sounds like the boot isn't closing properly.
Is there any adjustment on the hinges??
If the hinge bolts have come a little loose it could be out of alignment.

I haven’t noticed any. I am bringing it to MG on 8-May 2025, let them have a look. Just thankful I have isolated the source of the noise, honestly thought I was going nuts