Weird noise coming from my M2 Competition (solved: rear diff was slipping)

flugap · 01-21-2023, 01:51 PM

I recently bought my M2 with 10k miles on it. The car is a DCT. I noticed this sound when going low speeds in first gear about to change to second. I am able to recreate the sound when I go uphill. The sound is like metal parts/ brushing against each other/ hitting each other, I have attached the two videos if they help:

Anyone knows what the problem is:

https://youtube.com/shorts/aDX1XlXQeZ8

https://youtube.com/shorts/9c2_lz7JFd0

cb804 · 01-23-2023, 07:39 AM

Hopefully someone responds here.

Dabeamerking · 01-26-2023, 12:13 AM

Your under warranty no? 10k miles have the dealer replace the transmission

flugap · 02-04-2023, 05:27 PM

Turns out the rear diff was slipping

chris719 · 02-04-2023, 10:59 PM

Quote:

Originally Posted by flugap

Turns out the rear diff was slipping

Wow, that sucks. I guess it's better than needing a new transmission though. These diffs seem to go bad a lot more often than they should. The old E46 / E92 GKN diffs seemed to be more robust.

chmura · 02-06-2023, 03:22 PM

What was the fix??

doughboy · 02-09-2023, 03:31 PM

Quote:

Originally Posted by flugap

Turns out the rear diff was slipping

What does that mean? Never heard of a slipping diff, got any more info?

ashmostro · 02-27-2023, 05:52 PM

The clutch plates in the active diff can wear out, just like a transmission clutch.

doughboy · 02-28-2023, 01:50 AM

Quote:

Originally Posted by ashmostro

The clutch plates in the active diff can wear out, just like a transmission clutch.

Yes but they're not in the drive line, that's solid gearing.

The diff clutches are for locking control not drive torque like a transmission clutch.

So the OPs problem at low speed 1st gear won't be related to locking action as clutches will be fully open.

01-21-2023, 01:51 PM	#1
flugap Registered 3 Rep 4 Posts Drives: M2 Competition Join Date: Jan 2023 Location: California iTrader: (0)	Weird noise coming from my M2 Competition (solved: rear diff was slipping) I recently bought my M2 with 10k miles on it. The car is a DCT. I noticed this sound when going low speeds in first gear about to change to second. I am able to recreate the sound when I go uphill. The sound is like metal parts/ brushing against each other/ hitting each other, I have attached the two videos if they help: Anyone knows what the problem is: https://youtube.com/shorts/aDX1XlXQeZ8 https://youtube.com/shorts/9c2_lz7JFd0
	Appreciate 1 gnx759.50 Tweet Quote

01-23-2023, 07:39 AM	#2
cb804 Captain 2351 Rep 936 Posts Drives: 340 xDrive, M2C Join Date: Jul 2014 Location: Chicago iTrader: (0)	Hopefully someone responds here.
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01-26-2023, 12:13 AM	#3
Dabeamerking Second Lieutenant 119 Rep 210 Posts Drives: m4 Join Date: Dec 2022 Location: Los Angeles iTrader: (0)	Your under warranty no? 10k miles have the dealer replace the transmission
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02-04-2023, 05:27 PM	#4
flugap Registered 3 Rep 4 Posts Drives: M2 Competition Join Date: Jan 2023 Location: California iTrader: (0)	Turns out the rear diff was slipping
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02-06-2023, 03:22 PM	#6
chmura Colonel 1558 Rep 2,505 Posts Drives: 2019 M2 Competition Join Date: Aug 2009 Location: Orange County, California iTrader: (1)	What was the fix?? __________________ 2019 M2 Competition- October 2, 2018 ED 2011 BMW M3 Sedan Alpine White Picked up via ED 9/27/2011 & Redelivered 11/23/2011 SOLD
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02-27-2023, 05:52 PM	#8
ashmostro Brigadier General 1254 Rep 4,088 Posts Drives: 2020 M4cs \| 2022 M550i Join Date: Jan 2013 Location: Falls Church, VA iTrader: (27)	The clutch plates in the active diff can wear out, just like a transmission clutch.
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