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Inverter coolant pump failing?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by sharpdad, Jul 4, 2018.

  1. sharpdad

    sharpdad Junior Member

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    I've had a pump noise in the driver side engine compartment for a while and I have read up on it and thought it was the inverter coolant pump. Here is a video (not mine) of the same exact noise. Please go to the 50 second mark to hear the noise:



    Is this the inverter coolant pump? I do have turbulence in the reservoir so the pump is still working.

    Local shop will replace it and put new coolant in for $350.
     
    #1 sharpdad, Jul 4, 2018
  2. JC91006

    JC91006 Senior Member

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    The failing part is not an inverter pump, it's the 3 way coolant valve. You should have code P1121 when if fails, you'll also get a check engine light. If the shop you went to diagnosed it as an inverter pump failure....you should RUN

    There's no need to get it done in advance, your car won't break down when if fails, just get the check engine light for emissions
     
    #2 JC91006, Jul 5, 2018
    SFO, dolj and Raytheeagle like this.
  3. dolj

    dolj Senior Member

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    +1 definitely the 3 way coolant control valve.
     
    #3 dolj, Jul 6, 2018
    Raytheeagle likes this.
  4. sharpdad

    sharpdad Junior Member

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    Thanks very much! It was my own diagnosis from googling and not the shops.
     
    #4 sharpdad, Jul 6, 2018
  5. lastradakiwi

    lastradakiwi New Member

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    Did you end up fixing this issue? I think I also have a similar problem with my 2009.
     
    #5 lastradakiwi, Sep 25, 2024
  6. saneesh8

    saneesh8 Junior Member

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    Easy to check for failing Inverter coolant pump. Open the coolant reservoir for inverter coolant with Ignition on. You should see coolant movement. If it is not, then needs to replace the pump. Also it will threw a code with big read triangle when it fails and can't cool the inverter coolant.
     
    #6 saneesh8, Sep 25, 2024
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