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      12-29-2020, 12:23 PM   #1
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X3MC Making a Whining Sound on Startup

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I recently hit 12K miles and starting the other day I am experiencing a whining noise on startup on my 2020 X3MC. I’ve never heard this noise before. It goes away after about 10 seconds. In addition, I have also noticed that there is a slight, but noticeable shake when the car is idling.

Link to X3MC Startup Whine on Vimeo

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Last edited by btks; 12-29-2020 at 04:05 PM..
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      12-29-2020, 02:28 PM   #2
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Quote:
Originally Posted by btks View Post
I recently hit 12K miles and starting the other day I am experiencing a whining noise on startup on my 2020 X3MC. I’ve never heard this noise before. It goes away after about 10 seconds.
post some video to get better understanding what kind of noise is that.
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      12-29-2020, 03:53 PM   #3
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Originally Posted by Parnishka View Post
post some video to get better understanding what kind of noise is that.
Added a link to the video in my original post.
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      12-29-2020, 05:07 PM   #4
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Hmm, is it coming from underneath or engine bay?
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      12-29-2020, 05:13 PM   #5
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Originally Posted by positiveions View Post
Hmm, is it coming from underneath or engine bay?
It sounds like it is coming from underneath the car, but I’m not 100% sure. It’s happened the past few days.
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      12-29-2020, 06:56 PM   #6
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Originally Posted by btks View Post
It sounds like it is coming from underneath the car, but I’m not 100% sure. It’s happened the past few days.

Does it only happen on cold starts? If it happens on all starts, try to get someone to help you pinpoint it (starting the car again if you need to). Some component of the exhaust is the most obvious culprit.
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      12-29-2020, 07:06 PM   #7
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Originally Posted by Young04 View Post
Does it only happen on cold starts? If it happens on all starts, try to get someone to help you pinpoint it (starting the car again if you need to). Some component of the exhaust is the most obvious culprit.
It only happens first thing in the morning that I have noticed. It’s a very new noise though and occurring while I am out of town (700 miles away from home). Hopefully nothing that’ll be problematic when I head home. But this vehicle has not been good to me the past year.
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      12-29-2020, 08:53 PM   #8
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Mine made an identical sound this past week when I was parked outside in the cold overnight. I'm guessing it's a belt
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      12-29-2020, 10:13 PM   #9
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Quote:
Originally Posted by RR-NYC View Post
Mine made an identical sound this past week when I was parked outside in the cold overnight. I'm guessing it's a belt
I have the same issue too

People on the street look at me weird when it happens.
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      12-29-2020, 10:44 PM   #10
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Do you know there's a protective film on your instrument cluster you're supposed to take off? Lol
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      12-30-2020, 08:48 AM   #11
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I've been getting the same thing in cold weather
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      12-30-2020, 09:37 AM   #12
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Do you know there's a protective film on your instrument cluster you're supposed to take off? Lol
Yes. I'm weird about the protective films. I haven't removed them from the M badges in the headrests, the instrument cluster, nav/media display, etc. It was only a few months ago that the airbag label sticking out of the glove compartment was removed...
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      12-30-2020, 09:41 AM   #13
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Quote:
Originally Posted by scarzie View Post
I've been getting the same thing in cold weather
It's not super cold here, 30 degrees overnight and 40 when I started the car. But I haven't been parking in a garage since I am out of town. Maybe that's why I am noticing now.

Quote:
Originally Posted by R0ut3r View Post
I have the same issue too

People on the street look at me weird when it happens.
Same.

Quote:
Originally Posted by RR-NYC View Post
Mine made an identical sound this past week when I was parked outside in the cold overnight. I'm guessing it's a belt
Should I even bring this up to the dealership? It might be a "normal sound" like the tractor sounding engine or the clunk noise when turning, backing up, etc. due to the summer tires. I for one never had the noise with summer tires in the winter when I was running Michelins on my previous M3 and M4, but the stock Continentals suck anyways. I have been getting very spooked lately when I hear the noise - thinking I hit the curb, or hit another car backing out.
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      12-30-2020, 11:06 AM   #14
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Quote:
Originally Posted by btks View Post
I recently hit 12K miles and starting the other day I am experiencing a whining noise on startup on my 2020 X3MC. I've never heard this noise before. It goes away after about 10 seconds. In addition, I have also noticed that there is a slight, but noticeable shake when the car is idling.

Link to X3MC Startup Whine on Vimeo

Thanks
I heard the same thing when I was in Aspen this weekend. Might be a cold weather thing? It disappeared so I didn't put much thought into it.
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      12-30-2020, 12:40 PM   #15
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Quote:
Originally Posted by btks View Post
Quote:
Originally Posted by freshxdough View Post
Do you know there's a protective film on your instrument cluster you're supposed to take off? Lol
Yes. I'm weird about the protective films. I haven't removed them from the M badges in the headrests, the instrument cluster, nav/media display, etc. It was only a few months ago that the airbag label sticking out of the glove compartment was removed...
But it makes all the displays extremely glossy and honestly difficult to see when you have any kind of daylight. You should try looking at it when it's removed. Make you really appreciate the M Instrument Cluster and Central Information Display
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      12-30-2020, 01:46 PM   #16
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Doesn't seem normal to me but if it makes the sound for only a short period of time and doesn't seem to affect anything, I'd probably just live with it vs dealing with having dealership spend time on what they might eventually call "normal".
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      12-31-2020, 10:23 AM   #17
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Noticed mine also do this the last two days when on startup but we have very cold weather the now with snow so i would agree it’s something to do with cold weather on start up. It sounds like a belt slipping if i was to take a guess. If it stays once the temp goes back up i will take to dealer to get it checked.
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      12-31-2020, 03:19 PM   #18
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Quote:
Originally Posted by positiveions View Post
Hmm, is it coming from underneath or engine bay?
Quote:
Originally Posted by Young04 View Post
Does it only happen on cold starts? If it happens on all starts, try to get someone to help you pinpoint it (starting the car again if you need to). Some component of the exhaust is the most obvious culprit.
Quote:
Originally Posted by RR-NYC View Post
Mine made an identical sound this past week when I was parked outside in the cold overnight. I'm guessing it's a belt
Quote:
Originally Posted by R0ut3r View Post
I have the same issue too

People on the street look at me weird when it happens.
Quote:
Originally Posted by scarzie View Post
I've been getting the same thing in cold weather
Quote:
Originally Posted by ocX3Mcomp View Post
I heard the same thing when I was in Aspen this weekend. Might be a cold weather thing? It disappeared so I didn't put much thought into it.
Quote:
Originally Posted by Transfer View Post
Doesn't seem normal to me but if it makes the sound for only a short period of time and doesn't seem to affect anything, I'd probably just live with it vs dealing with having dealership spend time on what they might eventually call "normal".
Quote:
Originally Posted by Brian-f View Post
Noticed mine also do this the last two days when on startup but we have very cold weather the now with snow so i would agree it’s something to do with cold weather on start up. It sounds like a belt slipping if i was to take a guess. If it stays once the temp goes back up i will take to dealer to get it checked.
Okay, so I have determined that the noise is coming from the engine bay. It also sometimes happens even after driving for an hour. I was at the drive through ordering food and could hear what sounds like a squeaking belt. The temperature is currently 32 degrees.
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      12-31-2020, 10:32 PM   #19
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Oil pump has been known to make noise at extremely cold temperatures. Usually at startup though. The noise itself is normal though and not considered a defect.
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      01-02-2021, 08:24 PM   #20
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Quote:
Originally Posted by Parnishka View Post
Quote:
Originally Posted by btks View Post
I recently hit 12K miles and starting the other day I am experiencing a whining noise on startup on my 2020 X3MC. I've never heard this noise before. It goes away after about 10 seconds.
post some video to get better understanding what kind of noise is that.
I posted a while ago about this. I have 7k on x4m comp and only when its cold start when i start i get that whine for about 2-3 sec. sounds like some pulley and it goes away and no issues after till next cold start
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      01-21-2021, 05:14 PM   #21
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Quote:
Originally Posted by Daniely30 View Post
I posted a while ago about this. I have 7k on x4m comp and only when its cold start when i start i get that whine for about 2-3 sec. sounds like some pulley and it goes away and no issues after till next cold start
I had this repaired under warranty. It took a little over two weeks, but they ended up replacing the alternator belt tensioner, alternator, and lower idler pulley. The noise is now gone, both at idle and cold start, according to the service invoice I just received. I’ll pickup my vehicle tomorrow.
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      01-27-2021, 09:02 PM   #22
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Quote:
Originally Posted by btks View Post
I recently hit 12K miles and starting the other day I am experiencing a whining noise on startup on my 2020 X3MC. I've never heard this noise before. It goes away after about 10 seconds. In addition, I have also noticed that there is a slight, but noticeable shake when the car is idling.

Link to X3MC Startup Whine on Vimeo

Thanks
Following this thread. I have this issue as well on my 2020 X3M non comp. I do not daily mine and it's currently below 40 degrees in Missouri. I get the same sound for about 10-15 seconds on cold start.
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