"BUZZING/HUMMING" noise. Inside cabin driver side. Near dash.

druzai · 04-21-2024, 12:15 PM

I have this intermittent buzzing/humming noise that will randomly come and go. Changing the AC or power level of the fan does not change it. Radio volume or anything does not change it. It’s just a random buzzing noise inside the cabin. It does not happen often, but today it buzzed for a solid 2 to 3 minutes whereas it usually lasts 2-5 seconds.

kolosy · 04-21-2024, 05:56 PM

Is it inside the cabin, or could it be coming from the outside? Does pumping the brake make it happen?

druzai · 04-21-2024, 11:29 PM

kolosy yes pumping the brake. Its loudest when the door opens. So it’s driver side towards the firewall. 27E4 code, I’m assuming the brake pressure sensor?

amrazM · 04-22-2024, 05:09 AM

yeah that sensor makes the brake vacuum pump run, alot of times when people do a brake fluid change and spill fluid it damages the sensor.

kolosy · 04-22-2024, 07:55 AM

yep that's right. it's a little fiddly but easily doable yourself, without pulling the reservoir. and with a $20 amazon sensor. there's a thread on it floating around.

druzai · 04-22-2024, 09:33 AM

kolosy yea I did some research on it. Got the part order and prepared to lose some skin getting to it. I did my pads and I assume when I repressurized the brake system. Brake fluid leaked a bit and got on it. Makes sense

04-21-2024, 12:15 PM	#1
druzai Registered 0 Rep 3 Posts Drives: 2011 e92 m3 Join Date: Apr 2024 Location: Raleigh NC iTrader: (0)	"BUZZING/HUMMING" noise. Inside cabin driver side. Near dash. I have this intermittent buzzing/humming noise that will randomly come and go. Changing the AC or power level of the fan does not change it. Radio volume or anything does not change it. It’s just a random buzzing noise inside the cabin. It does not happen often, but today it buzzed for a solid 2 to 3 minutes whereas it usually lasts 2-5 seconds.
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04-21-2024, 05:56 PM	#2
kolosy Colonel 1518 Rep 2,040 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (2)	Is it inside the cabin, or could it be coming from the outside? Does pumping the brake make it happen? __________________ Current '21 DG X5MC, '22 X5M50i, '11 E90 M3 Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem.
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04-21-2024, 11:29 PM	#3
druzai Registered 0 Rep 3 Posts Drives: 2011 e92 m3 Join Date: Apr 2024 Location: Raleigh NC iTrader: (0)	kolosy yes pumping the brake. Its loudest when the door opens. So it’s driver side towards the firewall. 27E4 code, I’m assuming the brake pressure sensor?
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04-22-2024, 05:09 AM	#4
amrazM mTekMods 2149 Rep 2,906 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	yeah that sensor makes the brake vacuum pump run, alot of times when people do a brake fluid change and spill fluid it damages the sensor. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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04-22-2024, 07:55 AM	#5
kolosy Colonel 1518 Rep 2,040 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (2)	yep that's right. it's a little fiddly but easily doable yourself, without pulling the reservoir. and with a $20 amazon sensor. there's a thread on it floating around. __________________ Current '21 DG X5MC, '22 X5M50i, '11 E90 M3 Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem.
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04-22-2024, 09:33 AM	#6
druzai Registered 0 Rep 3 Posts Drives: 2011 e92 m3 Join Date: Apr 2024 Location: Raleigh NC iTrader: (0)	kolosy yea I did some research on it. Got the part order and prepared to lose some skin getting to it. I did my pads and I assume when I repressurized the brake system. Brake fluid leaked a bit and got on it. Makes sense
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