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Help! Something is running in the back of my car.

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Zipy, Jan 4, 2024.

  1. Zipy

    Zipy Junior Member

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    Just went into my garage to retrieve my keys from my 2016 Prius. Accidentally left them in the tray when I parked it about 5 hours ago. Something was buzzing/running in the back of the car. It wasn’t just the common occasional sounds that they make. It was constant. I got it to stop by starting the car briefly and then shutting it off. Nothing smelled hot. Could it be due to the keys being left in the car for an extended period? Should I be concerned and move it outside for the night?
     
    #1 Zipy, Jan 4, 2024
  2. FuelMiser

    FuelMiser Senior Member

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    That's the fuel vapor containment/capture system running a self-test. Has nothing to do with fob in the car. Totally normal.
     
    #2 FuelMiser, Jan 4, 2024
    fotomoto and bisco like this.
  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    ^ That.

    Pretty much any year 2000+ gas powered car, about 5 hours after shutdown
     
    #3 Leadfoot J. McCoalroller, Jan 4, 2024
  4. Zipy

    Zipy Junior Member

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    Thanks! Had me worried. Never heard it run constantly like that before.
     
    #4 Zipy, Jan 4, 2024
  5. ChapmanF

    ChapmanF Senior Member

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    The sound is the leak detection pump, and you'll hear it from around seven to around twenty-two minutes, depending on how long step C of the test happens to take.

    [​IMG]
     
    #5 ChapmanF, Jan 4, 2024
    mjoo likes this.
  6. Doug McC

    Doug McC Senior Member

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    Check your Owners Manual near the beginning (page 8 in the 2022 manual) under “For Your Information” for an explanation.
     
    #6 Doug McC, Jan 6, 2024
  7. Doug McC

    Doug McC Senior Member

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    Could you have made it any more complicated? :)
     
    #7 Doug McC, Jan 6, 2024
  8. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    .
     
    #8 Mendel Leisk, Jan 6, 2024
  9. ChapmanF

    ChapmanF Senior Member

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    Probably. Good thing Toyota designed it, not me, huh?
     
    #9 ChapmanF, Jan 6, 2024
    Doug McC likes this.
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