High-pitched electrical hum...

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by pearsonrj, May 22, 2008.

  1. pearsonrj

    pearsonrj Junior Member

    Joined:
    Jun 22, 2005
    64
    1
    0
    Location:
    Concord, CA
    Vehicle:
    2015 Prius Plug-in
    Model:
    Plug-in Base
    I've done a search on this and have not found a similar problem, so:

    My 2008 Touring Prius has just under 9,000 miles on it. About 2 weeks ago it started to make a high-pitched electrical humming sound that is quite noticeable. The sound is constant no matter whether the car is in electric-only mode, accelerating with gas/electric, or at a stop with or without the ICE running. The only wrinkle I have found is that when I turn off the A/C the pitch of the hum lowers. This leads me to believe that the hum is related to the high voltage supply.

    This is my second 2nd generation Prius, so I am very familiar with the usual humming sounds, coolant transfer pump etc. I will have the service people look at it at the next service, but wanted to see if anybody has noticed a similar issue.
     
    #1 pearsonrj, May 22, 2008
  2. aquapete

    aquapete Newbie Prius Owner

    Joined:
    Dec 9, 2007
    4
    0
    0
    Location:
    NE Phoenix area
    Vehicle:
    2007 Prius
    On one occasion, at a stop light, I noticed a high pitched hum and vibration. I thought that the driver to the right of me, also stopped, had a large boom box going in his car, that was causing the vibration. He looked over at me as if to ask, what's going on? I then realized the hum/vibration was coming from my car, not his.

    After I started up from the light, the hum and vibration disappeared and hasn't reoccurred. I would inquire to the dealer if it did reoccur, which it hasn't. Have no idea what caused it.

    I have a 2007 Prius hybrid. Purchased used at about 19,000 miles in Nov. 2007.
     
    #2 aquapete, May 22, 2008
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