What’s running long after car is shut off?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Cindy DeGraw, May 6, 2021.

  1. Cindy DeGraw

    Cindy DeGraw New Member

    Joined:
    May 6, 2021
    1
    0
    0
    Location:
    Kansas
    Vehicle:
    2012 Prius
    Model:
    Four
    It is a humming noise and seems to be coming from the general area of the hybrid plug midway under the car. Occurs randomly long after the car is turned off. Any ideas?
     
    #1 Cindy DeGraw, May 6, 2021
  2. sLick415

    sLick415 Member

    Joined:
    Apr 30, 2012
    214
    55
    0
    Location:
    San Francisco, CA
    Vehicle:
    2012 Prius
    Model:
    Three
    That's normal. Your car's checking for fuel leaks.
     
    #2 sLick415, May 7, 2021
  3. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,558
    10,330
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Is it 5 hours after you turn off the vehicle? Page 22 of the Owner's Manual:

    upload_2021-5-6_22-58-15.png
     
    #3 fuzzy1, May 7, 2021
    Dael and jerrymildred like this.
  4. Dael

    Dael Member

    Joined:
    Jul 6, 2019
    137
    32
    1
    Location:
    Ohio
    Vehicle:
    2020 Prius Prime
    Model:
    Limited
    Page 8 on 2020 manual
     
    #4 Dael, Feb 23, 2025 at 4:27 PM
  5. MAX2

    MAX2 Active Member

    Joined:
    Aug 12, 2024
    678
    202
    39
    Location:
    Third planet from the Sun
    Vehicle:
    2007 Prius
    Model:
    N/A
    Is the 2020 manual definitely written about Gen3?
    Look carefully at the section and topic.
     
    #5 MAX2, Feb 24, 2025 at 4:40 AM
    Dael likes this.
  6. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    25,523
    16,674
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    I wonder if Dael just wanted to note that the same self test still happens in 2020 models and is mentioned in that owners' manual too.
     
    #6 ChapmanF, Feb 24, 2025 at 11:42 AM
    Dael likes this.
  7. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    57,796
    39,879
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    When we get new cars I can never resist crawling under for a look. With the Prius the evap system activated while I was under, scared the cr@p out of me. :eek:
     
    #7 Mendel Leisk, Feb 24, 2025 at 11:57 AM
    Dael likes this.
(You must log in or sign up to post here.)