Slow thudding noise behind the dash when stopped

Discussion in 'Gen 2 Prius Technical Discussion' started by Banksy, Aug 27, 2020.

Tags:
  1. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    When I stop my car I hear this slow thudding noise.

    Is this the abs actuator? I thought that was a fast rattle snake kind of sound.

    I only heard it when stopped. Sounds like it's coming from near the middle of the dash.


    Very slow thudding sound.


    Any idea of what it is?
     
    #1 Banksy, Aug 27, 2020
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,181
    50,611
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    possible, or hvac vent
     
    #2 bisco, Aug 27, 2020
  3. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Hvac vent?

    I have the bottom glove box off however I don't hear it from there where the blower motor is
     
    #3 Banksy, Aug 27, 2020
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,181
    50,611
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    there are vent doors behind the dash that open and close to change air direction. sometimes they get stuck and make a kind of thumping sound. the brakes are a honking sound. does it only happen with foot on brake?
    can you post a recording?
     
    #4 bisco, Aug 27, 2020
  5. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    I can't get an accurate recording

    Sounds like it's coming from near the vent with the park button on it right near the nav screen

    Also happens when parked not foot on brake doesnt matter.
     
    #5 Banksy, Aug 27, 2020
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,181
    50,611
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    is it possible that it is happening while driving, but too quiet to hear?
     
    #6 bisco, Aug 27, 2020
  7. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE

    No I can't hear it while driving

    I can hear the fast clicking of what I assume is the ABS actuator. Which shuts off after a second or two but I can only hear the slow thudding at a stop

    I could be wrong though but I haven't noticed it while driving
     
    #7 Banksy, Aug 27, 2020
    bisco likes this.
  8. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    25,678
    16,775
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Recordings are super helpful in such situations.

    Here was one that turned out to be the guy's coolant control valve.

    [​IMG]
     
    #8 ChapmanF, Aug 27, 2020
  9. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    I will try to get a recording tomorrow
     
    #9 Banksy, Aug 27, 2020
  10. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    25,678
    16,775
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Does that one sound at all like yours?
     
    #10 ChapmanF, Aug 27, 2020
  11. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Can't open the file on my phone
     
    #11 Banksy, Aug 27, 2020
  12. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    25,678
    16,775
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Yeah, I think PriusChat wouldn't allow it uploaded without being zipped first. Has to be unzipped, then should play.
     
    #12 ChapmanF, Aug 27, 2020
  13. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Can you email it to me?
     
    #13 Banksy, Aug 28, 2020
  14. fotomoto

    fotomoto Senior Member

    Joined:
    Apr 22, 2009
    5,623
    3,800
    0
    Location:
    So. Texas
    Vehicle:
    Other Hybrid
    WAG: CD player
     
    #14 fotomoto, Aug 28, 2020
  15. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    So on further investigation it seems this does happen when both driving and still.

    Thudding seems to be at a constant pace then will sometimes get faster.

    Also does not do this when only in accessory mode

    do not know if it's me but when turning the wheel that seems to be the case.

    I have a recording of this however the website won't allow me to post it
     
    #15 Banksy, Sep 7, 2020
    Last edited: Sep 7, 2020
  16. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    7,035
    2,792
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    Well you have TWO good suggestions already......and you seem to be ignoring both of them.
    Let me add a third one: Something stuck in the blower fan.

    IF......you can't manage to find this sound, how do you figure to FIX it when it is found ?
    Take it to the shop.
     
    #16 sam spade 2, Sep 7, 2020
  17. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    25,678
    16,775
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    What format is the recording? Can you zip it and upload the zip file? PriusChat allows zip files.
     
    #17 ChapmanF, Sep 7, 2020
  18. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
     

    Attached Files:

    #18 Banksy, Sep 7, 2020
  19. Banksy

    Banksy Active Member

    Joined:
    Feb 7, 2020
    415
    132
    0
    Location:
    Lancaster Pennsylvania
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    IF......you can't manage to find this sound, how do you figure to FIX it when it is found ?
    Take it to the shop.[/QUOTE]


    Never


    Posted this a while ago didn't recall the suggestions you're mentioning.

    Also I'm sure if I took the dash panels off I could find it pretty quick. Would rather not do that yet.


    Assumed this has probably happened before on here.


    Which blower are you referring to? The one behind the glove box? Because if that's what you're talking about it's 100% not coming from there.
     
    #19 Banksy, Sep 7, 2020
(You must log in or sign up to post here.)