Prius making a weird noise while off

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by bobbintb, Dec 10, 2018.

  1. bobbintb

    bobbintb Junior Member

    Joined:
    Sep 11, 2018
    8
    1
    0
    Location:
    USA
    Vehicle:
    2012 Prius
    Model:
    ----USA----
    I went out to my garage last night and I heard a weird whirring type noise. It was coming from the back of my 2012 Prius, passenger rear. I turned the car on and off and the noise went away.

    I found this post:
    2012 Prius engine makes whirring noise | PriusChat

    Seems like the exact same issue but I was hoping someone can elaborate.
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    95,325
    43,213
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    yep, it's just an evaporations check for pollution controls. not sure where to find details, service manual?
     
    Raytheeagle and m.wynn like this.
  3. m.wynn

    m.wynn Senior Member

    Joined:
    Oct 24, 2013
    682
    1,215
    0
    Location:
    Queensbury, NY
    Vehicle:
    2014 Prius
    Model:
    Three
    Ha, that link is to an informative, or at least entertaining thread:D.

    What you heard is an evap system self check the car does at ~5 hours post shutdown. It goes on for several minutes. It's a faint buzz from just behind the rear driver side wheel well, at the charcoal canister. Not sure if it happens after every shutdown, but I'm a garage tinkerer and can confirm I hear it with regularity.
     
    CR94, Raytheeagle and bisco like this.
  4. bobbintb

    bobbintb Junior Member

    Joined:
    Sep 11, 2018
    8
    1
    0
    Location:
    USA
    Vehicle:
    2012 Prius
    Model:
    ----USA----
    Ok, I guess I won't worry then. I'm just never heard it before and it was pretty loud. But it was probably just reverberating off the garage door and made it seem louder than it was. Thanks.
     
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    95,325
    43,213
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    it was a couple years before i heard it. you have to be there at the right time.
     
Loading...