Humming from rear

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Ttsuam, Jul 1, 2025 at 2:07 PM.

  1. Ttsuam

    Ttsuam New Member

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    Vehicle:
    2019 Prius
    Model:
    XLE AWD-e
    Hello,

    I’ve recently bought a 2019 AWD XLE and when i was on the test drive i noticed a humming from the rear. I guessed that it was a wheel bearing since it seemed to sound the same and change when turning and with speed.

    I replaced one rear wheel bearing without giving the wheel a good shake to feel for looseness because i was confident i knew the issue, but the noise hasn't gone away.

    Could it just be road noise? This is my first prius and didnt test drive any others so I dont have a baseline. Any other ideas what it could be? I plan on changing the transmission/dif fluid soon anyway.
     
    #1 Ttsuam, Jul 1, 2025 at 2:07 PM
  2. bisco

    bisco cookie crumbler

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    could be the other side or a tyre. how many miles on her?
     
    #2 bisco, Jul 1, 2025 at 8:36 PM
  3. BiomedO1

    BiomedO1 Senior Member

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    Did you check the fluid level in the pumpkin and/or has it been ever checked or changed?

    This is neither here or there; but why did you buy it like that and not insist on them fixing that first? Has that car been in an accident before?
     
    #3 BiomedO1, Jul 1, 2025 at 8:52 PM
  4. Ttsuam

    Ttsuam New Member

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    Vehicle:
    2019 Prius
    Model:
    XLE AWD-e
    104k miles so far, I was thinking (hoping) that it could be the other side too; I will have to take a closer look. I should have mentioned that the tires are brand new so I dont think that would be the source.

    I haven’t checked the fluid yet, but thats a good idea to check/change. Am I reading the manual right that it takes ATF?

    As far as buying it with an issue, there aren't many used in my area and it was a reasonable price so I figured it was worth the hassle of tracking down the noise, especially since I was so sure it was the wheel bearing.
     
    #4 Ttsuam, Jul 1, 2025 at 10:43 PM
    Last edited by a moderator: Jul 2, 2025 at 3:35 PM
  5. AzWxGuy

    AzWxGuy Weather Guy

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    It might also be the AWD rear wheels electric motor. Don't know anything about the AWD version but I think it is AWD all the time. There might be some additional sounds associated with that.
     
    #5 AzWxGuy, Jul 2, 2025 at 9:34 AM
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