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Humming sound under rear of Prius C

Discussion in 'Prius c Technical Discussion' started by Jtimc7, Mar 1, 2019.

  1. Jtimc7

    Jtimc7 Junior Member

    Joined:
    Feb 27, 2018
    8
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    Location:
    Dallas, Texas
    Vehicle:
    2017 Prius
    Model:
    II
    Any thoughts on what the electrical humming sound I’m hearing underneath, in the rear of my 2017 Prius C might be?
    It usually occurs several hours after the vehicle has been driven. It lasts for a few minutes and then stops.
     
    #1 Jtimc7, Mar 1, 2019
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

    Joined:
    May 12, 2018
    7,427
    6,913
    1
    Location:
    Pennsylvania
    Vehicle:
    2018 Prius c
    Model:
    Two
    For that location and timing it is probably the evaporative emissions test taking place in the fuel system. Nearly every (gas-burning) modern car does something similar. Completely normal.
     
    #2 Leadfoot J. McCoalroller, Mar 2, 2019
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