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High pitched noise from drive unit

Discussion in 'Model 3: Driving Dynamics' started by Tony_YYZ, Mar 5, 2019.

  1. Tony_YYZ

    Tony_YYZ Tezler Guru

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    Have any of you ever experienced or read about a high pitched noise coming from the rear drive unit while driving? I can best describe it as a high pitched electrical noise that oscillates up and down as you adjust the power pedal.

    It's not incredibly loud in volume but it is very annoying to the ears. I'm currently battling with Tesla Service on this issue, they keep saying everything is normal but real life experience says otherwise.

    I'd like to know if anyone else experienced this and what the resolution was so that maybe I can pass some info to the service dept.

    This is definitely NOT the normal drive unit noise which I can also hear and is a pleasant sound!

    I hope I was descriptive enough. Thank you!
     
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  2. Bandit

    Bandit Member

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    I hear something that fits your description. It's quiet enough that I don't consciously notice it all the time. I remember thinking to myself if this was much louder, or if my ears were more sensitive it could be annoying.
     
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  3. Tony_YYZ

    Tony_YYZ Tezler Guru

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    They keep stating my ears are too sensitive. But literally anyone who gets in my car (except for service techs and engineers apparently) can hear it loud and clear.
     
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  4. cleveland97

    cleveland97 Member

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    Yes - in fact I've gone a bit OCD on it and found that it appears to be loudest between 38-43 MPH. :) Not kidding. And in that speed range, at least in my car, is loud enough to be annoying and even a little embarrassing when others are in the car.

    I haven't taken the step of having Tesla evaluate it, tho.
     
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  5. Tony_YYZ

    Tony_YYZ Tezler Guru

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    Yes this, exactly! I find it hits a peak loudness at various speeds, the earliest being around 55-57km/h.

    It is indeed very annoying and embarrassing. I can't be expected to turn up my music to drown it out everyday.
     
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  6. Matt-CYTR

    Matt-CYTR Member

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    Yep mine does the same thing. Worst around 70 KPH. Took it to Lawerence SC and of course it wasn’t neary as bad as it usually was when I took the tech out. They said to monitor and come back if it keeps happening. It’s a 2 hour drive though, so not easy to go back and have the same thing happen.

    I’d be curious to know if they do anything for you and/or what the issue is. If I go back I’ll post here and let you know what happens.
     
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  7. Tony_YYZ

    Tony_YYZ Tezler Guru

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    They asked me about an hour ago to go back in tomorrow and do another road test with the engineers that are on-site this week. The tech that I did a road test with yesterday confirmed he could hear it. I thought that it was finally going to get resolved.

    But their current answer on the matter is "It's behaving within normal parameters." I'm just bracing myself to hear that answer again tomorrow once I do the second road test.
     
  8. Bandit

    Bandit Member

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    If they all do it, and we're just lucky enough to notice it more than others I don't think there's anything they can do anyway. Unless yours is worse than mine, I've trained myself to tune it out. Sort of like how people who live beside a train track or under a flight path don't notice after a while.
     
  9. Tony_YYZ

    Tony_YYZ Tezler Guru

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    In the the other Model 3s I've been in, I can't say I've heard it before.

    I've been trying to train myself to tune it out but unfortunately it isn't working. I grew up with my bedroom facing a busy bus stop so I know all about tuning that noise out, haha.

    The service techs I've been working with are great guys. Unfortunately they are at the mercy of what Tesla engineering says is acceptable or not.
     
  10. Matt-CYTR

    Matt-CYTR Member

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    I’m a military pilot, so I don’t have the greatest hearing anymore anyways. I’m pretty used to noise, I don’t think it’s just me. I’ve been in my buddy’s M3 and his doesn’t make the noise at all. That being said, you could also be right and it’s just a certain frequency that we’re sensitive too. Honestly it doesn’t bother me that much, I was worried something was wrong with the car.

    Absolutely, that’s why it sucked going all the way there and then the car doesn’t do it, but such is life! Nice to know I’m not alone though haha.
     
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  11. richyrich

    richyrich Member

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    Yah I know the noise you mean but it's only at certain (lower) speeds for me and 99% of the time I don't notice. I've always assumed it's just a noise that an electric motor makes sometimes.

    Interested to hear if you get anywhere but I can't say it bothers me enough to go through hassle over. It's very possible it sounds worse for you though, or maybe you're just tuning into it? If you're saying other people notice (without you mentioning it?) then maybe not though.
     
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  12. Tony_YYZ

    Tony_YYZ Tezler Guru

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    It starts at a certain speed and then persists at all higher speeds. My car didn't used to emit this noise, it just started one day several months ago.

    I'll definitely report back either way.
     
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  13. Lozza12

    Lozza12 Member

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    My Leaf makes this noise at higher speeds. It’s the inverter.

    I doubt anything is broken but perhaps you will find it irritating.
     
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  14. StellarRat

    StellarRat Active Member

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    My Leaf did that 100% of the time and it was normal. I think maybe it is more buried in the M3, but potentially not an unusual sound. Also, very high pitched sounds are not heard by older adults even with normal hearing, so if you're in your early 20's you might be hearing something only young people can hear.
     
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  15. Tony_YYZ

    Tony_YYZ Tezler Guru

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    Interesting. I had also inquired if it might be the inverter but didn't get an answer.

    I'm in my mid 30s, lol.
     
  16. Tony_YYZ

    Tony_YYZ Tezler Guru

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    So I went back to service today and we did another road test with more audio recordings. The engineers are supposed to review it today when they get on-site.

    Gotta give a shout out to the service team in Mississauga. They are so awesome to deal with.
     
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  17. Majorgroove

    Majorgroove Member

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    Whats the verdict? I'm having similar issue. Thanks
     
  18. Tony_YYZ

    Tony_YYZ Tezler Guru

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    Apologies to everyone, I forgot to update the thread.

    The drive unit engineers again stated that this was completely normal. Tesla Service added some sound dampening material in my trunk and that made a minor difference to the noise but it is definitely slightly more muted than previously. The company's official stance on this matter is that noise is a normal part of the car.
     
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  19. GolanB

    GolanB Supporting Member

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    Some people have a natural sensitivity to high-pitched sounds. I am one of them. You may want to test your hearing range here: Extended High Frequency Online Hearing Test | 8-22 kHz and see where you fall on the scale. Interestingly, it was discovered in the '60s that people with athesma have an unusual sensitivity to high-frequency sound waves (although this doesn't explain my condition).

    As you age, you may notice that your sensitivity drops (I have 10 years on you). I've gotten used to the car, and have come to appreciate its unique sound profile. I almost always have something playing unless I'm trying to focus on my surroundings.
     
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  20. Tony_YYZ

    Tony_YYZ Tezler Guru

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    I took that test and could start hearing from around 20-21k.
     

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