Can anyone tell me what this noise is?

Rayland · 09-02-2021, 11:21 PM

Have a faint screeching/whining noise that I think is coming from the rear of the car. I made an appointment to bring it in to the dealer but didn't want to waste my time if it wasn't something serious.

The sound starts at around 25mph and doesn't go away from stepping on the brakes or going into neutral. Is this looking like the rear diff?

Any help is appreciated.

zeikei · 09-03-2021, 05:12 AM

If the sound does not change much whether you accelerate, coast or decelarate then I would suspect wheel bearing more than differential.

johnung · 09-03-2021, 11:40 AM

Quote:

Originally Posted by Rayland

Have a faint screeching/whining noise that I think is coming from the rear of the car. I made an appointment to bring it in to the dealer but didn't want to waste my time if it wasn't something serious.

The sound starts at around 25mph and doesn't go away from stepping on the brakes or going into neutral. Is this looking like the rear diff?

Any help is appreciated.

Year, model, mileage would help.

Rayland · 09-03-2021, 02:02 PM

It's the one in my sig and 60k miles, thanks.

Rayland · 09-04-2021, 04:12 PM

So I did some testing last night driving by an alley wall to see if it was the wheel bearings, and it did not appear to be coming from the wheels.

Anyone else have any ideas?

09-02-2021, 11:21 PM	#1
Rayland New Member 3 Rep 21 Posts Drives: 2016 435i xDrive Join Date: Jun 2021 Location: Colorado iTrader: (0)	Can anyone tell me what this noise is? Have a faint screeching/whining noise that I think is coming from the rear of the car. I made an appointment to bring it in to the dealer but didn't want to waste my time if it wasn't something serious. The sound starts at around 25mph and doesn't go away from stepping on the brakes or going into neutral. Is this looking like the rear diff? Any help is appreciated.
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09-03-2021, 05:12 AM	#2
zeikei Second Lieutenant 125 Rep 298 Posts Drives: F36 Join Date: May 2018 Location: Finland iTrader: (0)	If the sound does not change much whether you accelerate, coast or decelarate then I would suspect wheel bearing more than differential.
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09-03-2021, 02:02 PM	#4
Rayland New Member 3 Rep 21 Posts Drives: 2016 435i xDrive Join Date: Jun 2021 Location: Colorado iTrader: (0)	It's the one in my sig and 60k miles, thanks.
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09-04-2021, 04:12 PM	#5
Rayland New Member 3 Rep 21 Posts Drives: 2016 435i xDrive Join Date: Jun 2021 Location: Colorado iTrader: (0)	So I did some testing last night driving by an alley wall to see if it was the wheel bearings, and it did not appear to be coming from the wheels. Anyone else have any ideas?
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