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knocking/rattling noise

bktiger86

Member
Sep 3, 2016
325
158
West Covina, CA
Hi all,

Lately I've been stumped on finding where this noise is coming from. I especially hear it when I go over speed bumps/dips. I've searched all over the web at the possibility of it. I think it is coming from the rear seatbelt area. I want to ask for some help.

Anybody experiencing the same issue or maybe guide me where the noise is coming from/how to fix it?

I have a 2017 Model S.
 

Gur814

Member
Apr 4, 2016
26
10
Tucson, AZ
I have a Dec 2016 Model S and have a rattling coming from the rear right area as well. Last night my wife held her hand on the rear right door handle which seemed to make it go away.

It's definitely not the seatbelt on my car. It makes the noise regardless of if someone is sitting in the rear right seat or not.

I plan on bringing it in for service for several build issues soon. I'll let you know if they discover anything and fix it.
 

ig_epower

Member
Sep 10, 2016
184
201
Oakville
I sometimes hear a clunk on my left side as I drive over a speed bump. I find the bump has to cause my car to rock a little as it does not happen when I go over a speed bump evenly. I am wearing my seatbelt so it can't be that.
 

sgmorton

Member
Dec 22, 2016
73
51
Baytown,Tx
You might laugh at this but I had the same weird noise from what I thought was the rear passenger door area. Turned out to be my rear license plate holder only had two screws holding it in and every time I'd hit a bump it would rattle.
 
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boonedocks

MS LR Blk/Blk 19” OD-1/1/21 RN#1143376 DD 9/4 11am
May 1, 2015
3,058
5,493
Gainesville GA
I sometimes hear a clunk on my left side as I drive over a speed bump. I find the bump has to cause my car to rock a little as it does not happen when I go over a speed bump evenly. I am wearing my seatbelt so it can't be that.
Next time you are going over something that you believe will cause the "clunk" sound, reach down next to your seat with your left hand and pull the plastic anchor for the seatbelt out a bit. I am willing to bet the clunking sound is that hard plastic anchor tapping against your seat. It is so annoying and happens only in certain instances and when I am seated in a particular place in the seat. It is repeatable tho.

You can even take your hand and tap that piece against the seat and you'll probably recognize the sound.
 
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bktiger86

Member
Sep 3, 2016
325
158
West Covina, CA
I have a Dec 2016 Model S and have a rattling coming from the rear right area as well. Last night my wife held her hand on the rear right door handle which seemed to make it go away.

It's definitely not the seatbelt on my car. It makes the noise regardless of if someone is sitting in the rear right seat or not.

I plan on bringing it in for service for several build issues soon. I'll let you know if they discover anything and fix it.

Awesome brother. Please let me know if they discover anything.

You might laugh at this but I had the same weird noise from what I thought was the rear passenger door area. Turned out to be my rear license plate holder only had two screws holding it in and every time I'd hit a bump it would rattle.

Right now I don't have a license plate, but I will go double check to make sure all the screws are in tight. Thanks for the heads up.

Next time you are going over something that you believe will cause the "clunk" sound, reach down next to your seat with your left hand and pull the plastic anchor for the seatbelt out a bit. I am willing to bet the clunking sound is that hard plastic anchor tapping against your seat. It is so annoying and happens only in certain instances and when I am seated in a particular place in the seat. It is repeatable tho.

You can even take your hand and tap that piece against the seat and you'll probably recognize the sound.

I do hear this a lot that people say it might be the seatbelt but I never knew it can be the driver side. I will hold it next time and let you know if that is the case.

Thanks for all the suggestions!
 

f-stop

Active Member
Jul 31, 2015
1,470
1,422
Vancouver BC, Canada
Next time you are going over something that you believe will cause the "clunk" sound, reach down next to your seat with your left hand and pull the plastic anchor for the seatbelt out a bit. I am willing to bet the clunking sound is that hard plastic anchor tapping against your seat. It is so annoying and happens only in certain instances and when I am seated in a particular place in the seat. It is repeatable tho.

You can even take your hand and tap that piece against the seat and you'll probably recognize the sound.

+1

I had a clunking noise bugging me for about a year, it was intermittent, mostly when going over a bump in the road at low speed.
Like mentioned above, I finally figured out that putting my left hand between the lower plastic anchor piece of the seat belt and the lower side of the seat while driving stopped the noise.

so I stuck a 2" diameter adhesive piece of felt on the lower anchor plastic piece - noise gone.

I posted a photo of the felt pad I used in another thread:
Seat belt buckles noise
 

bktiger86

Member
Sep 3, 2016
325
158
West Covina, CA
Next time you are going over something that you believe will cause the "clunk" sound, reach down next to your seat with your left hand and pull the plastic anchor for the seatbelt out a bit. I am willing to bet the clunking sound is that hard plastic anchor tapping against your seat. It is so annoying and happens only in certain instances and when I am seated in a particular place in the seat. It is repeatable tho.

You can even take your hand and tap that piece against the seat and you'll probably recognize the sound.

So unfortunately, I tried holding the seat belt area and it didn't fix the issue. It still sounds like from the back seat driver side.
 

Herbys

Member
Jul 3, 2012
73
19
If you hear knocking, maybe you need to move up to higher octane fuel.
OK, now seriously, having had my MS for four years and my MX for one, I have some experience with noises. In most cases it was nothing.
For example, a right side rattle I thought was on my passenger's door on my MX turned out to be the cover for the seat rails which a passenger had kicked out of place. A clunk on the MS when hitting bumps that drove me crazy for a while turned out to be a charging adaptor lose in the frunk. And a frequent rattle in both cars happened when the passenger's belt buckle was flipped and it was banging against the B pillar.
Of all the noises I had only one was mechanical: front A arm bushings were worn (or damaged). This was apparently a common problem in early Model Ss, but maybe something similar is happening with your rear arms.
Now, if it is just rattling, you can try driving with someone in the rear seat that can try to identify the source. It is hard to do when two thirds of the car lie behind your ears and the sound comes from that direction.
 

Art VandeIay

Attractive Membrane
Jun 12, 2016
234
332
Elon’s left eyebrow
I hear a suspension rebound clunk from going over speed bumps. 2017 S90D Air Suspension. I do not hear this same rebound clunk one our 2014 S85 with Air Suspension.

I have this same issue with my 2017 S 90D with Air Suspension. I can clearly hear the rebound clunk since its maiden voyage out of the Service Center on Feb 20, especially on the front end of the car. :(

I can also hear what I think is a rattle coming from the split-rear seats (possibly the passenger side), but I'm not quite sure how to test my theory...

@bktiger86 I saw you video but I can't tell if the noise is coming from the back end of the car as the shot is very dark.
 

bktiger86

Member
Sep 3, 2016
325
158
West Covina, CA
I have this same issue with my 2017 S 90D with Air Suspension. I can clearly hear the rebound clunk since its maiden voyage out of the Service Center on Feb 20, especially on the front end of the car. :(

I can also hear what I think is a rattle coming from the split-rear seats (possibly the passenger side), but I'm not quite sure how to test my theory...

@bktiger86 I saw you video but I can't tell if the noise is coming from the back end of the car as the shot is very dark.

Sorry. Yeah mainly I was trying to record the sound. It was coming from the driver side rear seats near the seat belt.
 

bktiger86

Member
Sep 3, 2016
325
158
West Covina, CA
UPDATE:

I just want to give people some updates regarding this rattling noise. Took it to the service center, they did a test drive and they found out the issue.

They removed and replace the strut assembly. Now I don't hear anything :)
 

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sorka

Well-Known Member
Feb 28, 2015
8,242
6,014
Merced, CA
UPDATE:

I just want to give people some updates regarding this rattling noise. Took it to the service center, they did a test drive and they found out the issue.

They removed and replace the strut assembly. Now I don't hear anything :)

And it will probably stay that way as long as you stop flying over speedbumps ;)
 
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boonedocks

MS LR Blk/Blk 19” OD-1/1/21 RN#1143376 DD 9/4 11am
May 1, 2015
3,058
5,493
Gainesville GA
UPDATE:

I just want to give people some updates regarding this rattling noise. Took it to the service center, they did a test drive and they found out the issue.

They removed and replace the strut assembly. Now I don't hear anything :)

Glad you were able to reproduce & record it & have it repaired.
 

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