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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Knocking noise coming from rear of car
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      07-18-2017, 08:18 PM   #1
pj94z
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Knocking noise coming from rear of car

I have a 2017 340i M sport with 1200 miles.

Today, I noticed a constant knocking sound coming from the rear of the car and my passenger also noticed it sitting inside the car.

(Sounds a bad pulley almost)

I took a short video of the noise, I'll upload here if I can figure out how

Any ideas on what this may be ?
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      07-18-2017, 10:32 PM   #2
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Try posting the video to YouTube and then post a link here. Glad I could be of help
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      07-19-2017, 06:28 AM   #3
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Quote:
Originally Posted by eluded View Post
Try posting the video to YouTube and then post a link here. Glad I could be of help
Here's a link to the video on YouTube:

https://youtu.be/CxSLJCPR8OM
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      07-19-2017, 06:41 AM   #4
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Try taking the car to your dealership where they'll diagnose and repair it under warranty...
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      07-19-2017, 10:50 AM   #5
Michael Schott
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Free the guy stuck in your trunk:-).
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      07-19-2017, 11:35 AM   #6
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maybe this will help?
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      07-19-2017, 12:24 PM   #7
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Well, that' a weird place for that sound to come from for a car that isn't moving. Perhaps the sound is traveling down the tunnel...?

Anyway, yes, get it checked out.
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      07-20-2017, 12:59 AM   #8
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Does it sound rotational? I head a tapping sound during acceleration for a while... then my back axel snapped in half.
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      08-08-2017, 04:17 PM   #9
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I have this exact same issue any update OP?
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      08-30-2017, 10:00 PM   #10
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I have this issue on my 330i. I think it is coming from the exhaust hitting something somewhere but not too sure. I can make it louder by stepping on the brake and lightly pushing the gas to load the drivetrain.

Seems to be much louder when the fuel tank is close to empty (maybe just a coincidence).
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      09-26-2021, 04:06 AM   #11
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There is an SIB out for this.

Some threads below talk about this.

https://static.nhtsa.gov/odi/tsbs/20...61557-9999.pdf

https://g20.bimmerpost.com/forums/sh...php?p=27843899

https://f30.bimmerpost.com/forums/sh....php?t=1424308
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