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  1. #1
    Registered Member One Ring
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    May 24 2018
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    419385
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    Texas

    2015 s7 humming noise at stop, when applying brake, and sometimes when driving

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    Hi guys. I was hoping to get some help to see if anyone could diagnose the issue.

    As the title states, I have an Audi s7 2015 just purchased cpo with 13k miles. Itís got a weird intermittent humming sound that comes and goes. I hear it when Iím at a complete stop idling, when Iím braking, and rarely as I drive.

    Iíve had days where I donít hear a thing and then some days when I hear it often as I drive around town. Itís only been at the dealership for a short time frame but Iíd like to see if anyone has any suggestions as to what is causing this sound. Thanks!!

    Below is the YouTube for the sound when Iím at a red light.

    https://youtu.be/4FNmJGO_xtA

  2. #2
    Veteran Member Four Rings wwhan's Avatar
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    Mar 26 2010
    AZ Member #
    56662
    Location
    CA

    Have looked in the back seat to see if you have a passenger? ghosts?
    2016 S6 Sport, EPL, Eurocode Sways & Endlinks

  3. #3
    Registered Member One Ring
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    May 24 2018
    AZ Member #
    419385
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    Texas

    Quote Originally Posted by wwhan View Post
    Have looked in the back seat to see if you have a passenger? ghosts?
    Lol if it was only that. It would make for an interesting car.

  4. #4
    Active Member Three Rings
    Join Date
    Jan 02 2018
    AZ Member #
    411920
    Location
    El Paso, TX

    There's a similar noise when the A/C compressor is working. Didn't sound like that on your video, but it could be your phone. Try turning A/C on and off and see if it stops. If not, then I have no idea what it could be. Good luck.
    2018 S6 mythos black/black; S sport package, driver assistance package, 20" black optic package, carbon atlas, Audi rings, all-weather mats, 35/20% tint

  5. #5
    Stage 2 Banner Advertiser Three Rings AutoTalent's Avatar
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    Apr 24 2015
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    329223
    Location
    Los Angeles

    Quote Originally Posted by Mykohph View Post
    Lol if it was only that. It would make for an interesting car.
    At least they wouldn't weigh anything haha.

    Sounds interesting though, would like to know what caused it when you get it fixed.

    Dan@AutoTalent.com

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  6. #6
    Veteran Member Four Rings wwhan's Avatar
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    Mar 26 2010
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    56662
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    CA

    I do find the low speed Heat/AC fan motor noise to be annoying, maybe that is why it likes run full blast most of the time.
    2016 S6 Sport, EPL, Eurocode Sways & Endlinks

  7. #7
    Established Member Two Rings dspl1236's Avatar
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    Dec 15 2007
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    23386
    My Garage
    '98 A4 1.8tqm, '91 80q
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    Akron, Ohio
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    I have the exact same on my 3.0T A6. Been driving me nuts. I thought it was wheel bearings...so I replaced those. Now I think it is the rotor howling from the ridges on the pads just riding on them. Brakes are the next task.
    '13 A6 3.0T - daily
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  8. #8
    Registered Member One Ring
    Join Date
    May 24 2018
    AZ Member #
    419385
    Location
    Texas

    The sound is also there when the air conditioner is off. Itís been at Audi for the past 5 days. They said theyíve narrowed it down to crank box or fans but itís so intermittent they havenít been able to catch it when the hood is open.

    Itís been escalated with Audi and my rep says we should hear something by Monday for a fix. Iíll keep you guys updated.

  9. #9
    Senior Member Two Rings
    Join Date
    Dec 13 2015
    AZ Member #
    365758
    My Garage
    '17 Audi S7
    Location
    CA

    When you say crank box, do you mean the crankcase ventilation or PCV?

    If it is that, maybe the sound youíre hearing are the precursors to the more loud whistling that is heard after it has fully degraded.
    2017 S7 | Glacier White Metallic

  10. #10
    Registered Member One Ring
    Join Date
    May 24 2018
    AZ Member #
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    Location
    Texas

    Quote Originally Posted by Frenetic View Post
    When you say crank box, do you mean the crankcase ventilation or PCV?

    If it is that, maybe the sound youíre hearing are the precursors to the more loud whistling that is heard after it has fully degraded.
    I donít remember exactly what he said but crankcase ventilation sounds about right. Then again my friend just had his pcv replaced due to loud whistling. Iíll let you know when I get word from the dealer.



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