Gen 3 2015 Prius Squeaking Sound Under the Hood (w/ video)

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by HiddeninPlainSightPrius, Jan 15, 2022.

  1. HiddeninPlainSightPrius

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    Anyone know what this could be, my 3rd gen 2015 prius with 38k miles is making a not so loud squeaking sound when engine turns on to charge hybrid battery.(when in idle)

    Check out this video, squeaking starts at 1:19

     
  2. bisco

    bisco cookie crumbler

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    hard to hear it, does it do it in ev?
     
  3. HiddeninPlainSightPrius

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    No never in ev, only when engine working in idle
     
  4. HiddeninPlainSightPrius

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    Here's an newer video, seems like it's now became a nonstop whining sound, but still squeaks the same at the end:

     
  5. bisco

    bisco cookie crumbler

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    still difficult to hear, but i do hear something. noises under the hood are usually one of the pumps, especially the 3 way coolant pump. but diagnosis is difficult without a stehescope and/or trouble codes.
    38k is pretty new to have issues, unless something is defective.
    is the hvac completely off, temp set to low, fan off?
    have you owned it since new?
     
  6. privilege

    privilege Active Member

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    that sounds like a bearing failing. have you tried disconnecting the fans for a moment to see if it stops ?
     
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