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Loud chirping whining sound while driving

Discussion in 'Gen 2 Prius Technical Discussion' started by ernie1, Mar 28, 2013.

  1. ernie1

    ernie1 Junior Member

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    I have a 2008 Prius with 111,000 miles on it and lately, I hear a loud chirping, whining sound that is louder under acceleration and seems to vary only according to acceleration or deceleration. Acceleration makes a louder sound. The noise does not occur when vehicle is cold and first driven. It's only after it's driven for awhile and things are warmed up but then again, it doesn't always do it even though it's warmed up. Not sure I could reproduce the sound if I brought it to a dealer for service. When the noise does start up, it's very apparent and loud and then, after awhile, it goes away temporarily only to start up again. What do you guys think?
     
    #1 ernie1, Mar 28, 2013
  2. 8t8mph

    8t8mph Junior Member

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    Hi. I have a 2007 with the same symptoms you mentioned. I didn't see any reply to your question. I was going to ask the forum the same question but I thought I'd ask you first if you've been able to figure out what is causing the whining sound? Thanks.
     
    #2 8t8mph, Sep 3, 2013
  3. nh7o

    nh7o Off grid since 1980

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    The first guess on this sort of thing is wheel bearing. Try turning left and right sharply and see if the sound is different as a result of different loading on the bearings.
     
    #3 nh7o, Sep 3, 2013
  4. jdcollins5

    jdcollins5 Senior Member

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    You also may want to check your brake pads. The pads have wear indicators and they give off a chirping sound.
     
    #4 jdcollins5, Sep 3, 2013
  5. edthefox5

    edthefox5 Senior Member

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    Second it does this put the car in neutral and see if the sound goes away. If so its engine related not running gear.

    Try putting the car in inspection mode and listen under the hood.

    Also given your mileage your way over due for many maintenance items. Sometime addressing those will reveal issues. Like going to the doctor for a check up.

    1---Trans fluid replacement
    2--Both engine and hybrid coolant replacement

     
    #5 edthefox5, Sep 3, 2013
  6. PhilWray

    PhilWray Member

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    #6 PhilWray, Sep 3, 2013
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