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F80/F82/F83 M3 and M4 (2015 - Current)
F80 BMW M3 sedan, F82 BMW M4 coupe and F83 M4 convertible forum. This 5th generation M3 and all new M4 features a 3.0 liter twin turbo engine (engine code S55) 425hp and 406lbs of torque! Heavy use of light weight materials makes this generation lighter and faster then the outgoing E9x M3.

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  #1  
Old 07-10-2019, 07:17 PM
anthony_12347 anthony_12347 is offline
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Mein Auto:
Help with high-pitch whine in cabin on new M4

Hi there, new to the forum and just recently bought a new 2020 M4 Competition, having one irritating issue that hopefully someone can help with.

Ever since around 1000Km, I started noticing a faint high-pitch whine in the cabin when the car was on. Didn't think too much of it, and tried to ignore it, but it's gotten significantly worse as the car has put on more mileage. It's to the point where anybody who rides in it comments on the noise, and it's becoming very irritating and worsening every week.

The noise sounds like a very distinct 'electrical' high-pitch whine or whistle. It is loud enough to be heard when windows are closed and can be heard over the stereo on low. It is continuous, does not change in pitch, and can be heard when stopped or moving. It appears to be coming from somewhere in the dash, or the engine compartment very close to the firewall.

I also tried some different scenarios and here's what I found:
1. It does not change at all with the A/C or fan settings while the car is on or off. Saw some other forum posts where a similar noise was distinctly the A/C but doesn't seem like it here. I have also tried toggling interior, exterior lights, turning the display on/off, bluetooth on/off, makes no difference.

2. It's not the M4 seat logos. They do make a similar noise but they are off when driving.

3. When the ignition is turned on but engine is not started (press stop/start without foot on brake), it not there.

4. Once you start the engine, the noise can be heard. As soon as you take it out of park, even moving to Neutral, it gets even louder. After that, it's constant and does not very with RPM, Drive Mode, acceleration, etc.

5. Interestingly, using the Auto Stop/Start feature, when I come to a stop, the engine shuts off as expected while I'm in gear, but the whine noise is actually still present (and can be heard much more clearly), even after the car shuts the engine down.

So from what I can deduce so far, especially from the test from the auto Stop/Start engine shutdown, is that this seems to be coming from something electrical when the ignition is on, as I'm pretty sure the A/C and engine itself aren't at play here.

Going to give it a little while and then have the dealer take a look at it, but any advice to point me in the right direction would be greatly appreciated!
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  #2  
Old 07-11-2019, 10:17 AM
glennbaz glennbaz is offline
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Location: Green Valley AZ
 
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Posts: 133
Mein Auto: 2016 M4 Convertible
High pitch noises anywhere are very difficult to pinpoint. Try and find a house alarm that uses a high pitch sounding device. Very difficult. My suggestion is very basic and simple and some people will laugh at it. Having worked in the automotive field for 50 years sometimes simple is better. Try using a 3 foot piece of rubber tubing held up against one ear. Block your other ear with an ear plug. When the noise is present move it all around the cabin and see if you can pinpoint the source. It's cheap and you have nothing to loose. Good luck.
Glenn
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Old 07-13-2019, 01:00 PM
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Technic Technic is offline
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Posts: 8,125
Mein Auto: 2017 M3
Unplug ASD module, try again.

Quote:
Originally Posted by anthony_12347 View Post
Hi there, new to the forum and just recently bought a new 2020 M4 Competition, having one irritating issue that hopefully someone can help with.

Ever since around 1000Km, I started noticing a faint high-pitch whine in the cabin when the car was on. Didn't think too much of it, and tried to ignore it, but it's gotten significantly worse as the car has put on more mileage. It's to the point where anybody who rides in it comments on the noise, and it's becoming very irritating and worsening every week.

The noise sounds like a very distinct 'electrical' high-pitch whine or whistle. It is loud enough to be heard when windows are closed and can be heard over the stereo on low. It is continuous, does not change in pitch, and can be heard when stopped or moving. It appears to be coming from somewhere in the dash, or the engine compartment very close to the firewall.

I also tried some different scenarios and here's what I found:
1. It does not change at all with the A/C or fan settings while the car is on or off. Saw some other forum posts where a similar noise was distinctly the A/C but doesn't seem like it here. I have also tried toggling interior, exterior lights, turning the display on/off, bluetooth on/off, makes no difference.

2. It's not the M4 seat logos. They do make a similar noise but they are off when driving.

3. When the ignition is turned on but engine is not started (press stop/start without foot on brake), it not there.

4. Once you start the engine, the noise can be heard. As soon as you take it out of park, even moving to Neutral, it gets even louder. After that, it's constant and does not very with RPM, Drive Mode, acceleration, etc.

5. Interestingly, using the Auto Stop/Start feature, when I come to a stop, the engine shuts off as expected while I'm in gear, but the whine noise is actually still present (and can be heard much more clearly), even after the car shuts the engine down.

So from what I can deduce so far, especially from the test from the auto Stop/Start engine shutdown, is that this seems to be coming from something electrical when the ignition is on, as I'm pretty sure the A/C and engine itself aren't at play here.

Going to give it a little while and then have the dealer take a look at it, but any advice to point me in the right direction would be greatly appreciated!
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  #4  
Old 07-18-2019, 11:42 PM
ard ard is offline
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Location: Sierra foothills, California USA
 
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Mein Auto: '12 X5 35d/E39M5/996TTX50
Pull the fuse for the audio amp.

if it stops, that tells you it's something in the audio chain. Ground loop perhaps?
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