Rear Axle Diff lock

Ryanf80M3 · 04-07-2020, 05:58 AM

So after filling up my 2015 F80 M3, got back in the car and started the engine. The car was flicking between N and P without me touching anything. I put the car into D, and a warning light popped up and the message "rear axle differential lock. Driving stability limited"

Can anyone shed any light on what this could be or if it's a common fault? I'm totally useless when it comes to any sort of fault diagnosis with cars!

Thanks In advance!

RoundelM3 · 04-07-2020, 07:42 AM

I also have a 2015 F80 M3, but haven't experienced this. First thought is that since the M-Diff is operated by servomotor, there's a possibility that your battery is getting weak and/or the servo may have an issue. You may want to have a dealership or a good Independent shop check that for you. The Lithium-Polymer battery is supposed to last as much as 8 or 9 years, but its possible yours isn't charging properly.

CanAutM3 · 04-07-2020, 08:24 AM

Fault with the e-diff.

Not particularly common. Just bring the car to the dealer to get it checked/fixed.

Ryanf80M3 · 04-07-2020, 08:51 AM

Quote:

Originally Posted by CanAutM3

Fault with the e-diff.

Not particularly common. Just bring the car to the dealer to get it checked/fixed.

Going to take it over shortly, hopefully not an expensive one 😞

CanAutM3 · 04-07-2020, 10:42 AM

Quote:

Originally Posted by Ryanf80M3

Going to take it over shortly, hopefully not an expensive one ��

It could be only a sensor...

Has the warning disappeared?

Ryanf80M3 · 04-08-2020, 06:09 AM

Quote:

Originally Posted by CanAutM3

Quote:

Originally Posted by Ryanf80M3

Going to take it over shortly, hopefully not an expensive one ��

It could be only a sensor...

Has the warning disappeared?

Hi mate, they rang me an hour ago and said it's flagging up a faulty sensor but the battery is also low. Which is weird as the car get driven most days, but he said they're going to charge it and that should be fine

andrei.m4 · 04-09-2020, 09:55 AM

Rear diff have no sensors, the only one is just for temperature. And the servomotor is closed, you can just replace it.

Ryanf80M3 · 04-12-2020, 05:49 AM

Quote:

Originally Posted by andrei.m4

Rear diff have no sensors, the only one is just for temperature. And the servomotor is closed, you can just replace it.

Quote:

Originally Posted by andrei.m4

Rear diff have no sensors, the only one is just for temperature. And the servomotor is closed, you can just replace it.

Think it was a front ABS sensor mate

04-07-2020, 05:58 AM	#1
Ryanf80M3 New Member 21 Rep 28 Posts Drives: F80 M3 Join Date: Jan 2020 Location: Sunderland iTrader: (0)	So after filling up my 2015 F80 M3, got back in the car and started the engine. The car was flicking between N and P without me touching anything. I put the car into D, and a warning light popped up and the message "rear axle differential lock. Driving stability limited" Can anyone shed any light on what this could be or if it's a common fault? I'm totally useless when it comes to any sort of fault diagnosis with cars! Thanks In advance!
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04-07-2020, 07:42 AM	#2
RoundelM3 Major General 1835 Rep 6,990 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	I also have a 2015 F80 M3, but haven't experienced this. First thought is that since the M-Diff is operated by servomotor, there's a possibility that your battery is getting weak and/or the servo may have an issue. You may want to have a dealership or a good Independent shop check that for you. The Lithium-Polymer battery is supposed to last as much as 8 or 9 years, but its possible yours isn't charging properly. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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04-07-2020, 08:24 AM	#3
CanAutM3 General 21115 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Fault with the e-diff. Not particularly common. Just bring the car to the dealer to get it checked/fixed. __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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04-09-2020, 09:55 AM	#7
andrei.m4 Second Lieutenant 113 Rep 291 Posts Drives: bmw f82 Join Date: Mar 2019 Location: Romania iTrader: (0)	Rear diff have no sensors, the only one is just for temperature. And the servomotor is closed, you can just replace it.
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