2006 Prius Whirring/purring noise at 38 mph

Discussion in 'Gen 2 Prius Main Forum' started by Cameron Ransford, Oct 31, 2019.

  1. Cameron Ransford

    Cameron Ransford New Member

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    My 2006 Prius is making a weird whirring/purring noise any time I drive it over about 38 mph. It stays fairly constant above that 38 mph threshold and does not change when I turn the car one direction or the other (making me think it’s something other than a wheel bearing). It’s difficult to describe the noise exactly, but it’s kind of a staticky vibration type noise. I’ve looked through several forums but haven’t found anything that pinpoints it exactly. Any thoughts on what it could be? I’ve included a video in case someone can help identify the issue from that.
     
  2. PriusCamper

    PriusCamper Senior Member

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    There's lots of noises in that video. Is it the same noise you hear before you start the car and put your foot on the brake? Is that the specific noise you're referring to?
     
  3. bisco

    bisco cookie crumbler

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    yeah, unfortunately, you can't make out much from the recording.

    some common areas:

    hvac vent doors or motors

    3 way coolant pump

    brake pump

    underbody plastic shield hanging down

    fender liner loose
     
    #3 bisco, Oct 31, 2019
    Last edited: Oct 31, 2019
  4. Renee'

    Renee' New Member

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    Hello Cameron Ransford You could give my friends a call I guarantee they could help you! 812-752-5050
     
  5. Cameron Ransford

    Cameron Ransford New Member

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    So you can hear the noise at the beginning of the video, then I slow down to below 40 mph and the noise stops, then I speed up again to show where it picks back up again (around 38 mph). Not sure if that helps. The volume might be coming through more on my phone than others?
     
  6. Cameron Ransford

    Cameron Ransford New Member

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    It might be trickier to hear on the video, but it sounds like kind of a rapid clicking that is coming from the drivers side. It’s difficult to tell if it’s coming from within the engine/electrical components or from outside of the vehicle, however it doesn’t seem to get louder when I open the windows.
     
  7. Aegean

    Aegean Member

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    Put in in neutral when you are at 45 mph. Any change?
     
  8. Cameron Ransford

    Cameron Ransford New Member

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    Nope, no change in neutral. I was thinking maybe a belt? But my knowledge of noises like this is rudimentary at best.
     
  9. Cameron Ransford

    Cameron Ransford New Member

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    And there were no precipitating symptoms for this noise other than kind of a brief and occasional hiccuping motion that seems totally random and kind of a clicking noise sometimes when I break or after I put it into park. Not sure if that’s normal for a Prius or if it’s related to this noise at all, but I figure any further info might help. I only purchased the vehicle about 4 months ago so I’m kind of clueless when it comes to diagnosing these things.
     
  10. Aegean

    Aegean Member

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    Then it appears it is not related to transmission.

    One thing you can easily check if the plastic bottom engine cover is broken in the front from hitting a curb or missing screws. When speed is sufficient, air pushes this plastic down and it could touch the pavement making similar noises. When the car is stopped it goes up in its place again.
     
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