HV battery effecting engine performance??

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by MeGuinness, May 9, 2017.

  1. MeGuinness

    MeGuinness Member

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    Hi guys,so my quest in to find why my Prius as become sluggish continue...
    Can a HV battery on his way out make the engine feel like driving a slag? I'm using power mode all the time to try alleviate my pain !
    Even when the engine starts it feels like it is slow (the engine starting procedure isn't as zippy as it was when new )and i do get different humming noises depending of the charging state of the battery when not moving at idle!
    For sure some of the HV cells aren't up to the job ,i been checking them while driving with a smartphone app and i can see that 7 8 9 are the fastest to loose voltage when on EV mode , the car suddenly loose speed with a evident cogging feeling and then the engine starts.....Sluggish !!
    CHECK HYBRID SYSTEM comes up sometime too (Toyota got no idea why)
    Any suggestions appreciated before it driving me completelyinsane,thanx
     
    #1 MeGuinness, May 9, 2017
  2. Former Member 68813

    Former Member 68813 Senior Member

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    The answer is yes. I presume outside warranty? If you're using EV a lot, you're abusing the HV battery (extra wear and tear).
     
    #2 Former Member 68813, May 9, 2017
  3. JC91006

    JC91006 Senior Member

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    When the battery soc is depleted, the car's performance is usually pretty bad. That is pretty normal. You'll have to wait until the soc recovers and the car's performance will return.

    Have you checked your engine oil level lately?

    SM-N900P ?
     
    #3 JC91006, May 9, 2017
  4. MeGuinness

    MeGuinness Member

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    Engine oil is good ,level is slightly down ,still clean after 4k from last change,200k on the clock.
    What the SOC should be ?
    Thanx

    Posted via the PriusChat mobile app.
     
    #4 MeGuinness, May 9, 2017
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    This is an ongoing battle. No warning lights? I can't recall.
     
    #5 Mendel Leisk, May 9, 2017
  6. MeGuinness

    MeGuinness Member

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    No warning lights...only sometimes the CHECK HYBRID SYSTEM error.
    Is there a way to stop the inverter to charge the HV ? If I stop the the charging load I may see how the engine perform.

    Posted via the PriusChat mobile app.
     
    #6 MeGuinness, May 10, 2017
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    There's some maintenance modes, that prevent engine from shutting down. Not sure if they also prevent charging; they make the engine run "conventionally"? If you've got "check hybrid system" displayed I would think there's codes stored. Maybe dealership can check?
     

    Attached Files:

    #7 Mendel Leisk, May 10, 2017
  8. FuelMiser

    FuelMiser Senior Member

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    You realize Power Mode only changes the throttle mapping, it does not add any real power...
    When we had our 2005 Gen 2 at the end of its "life" we would experience rapid swings from Full to Empty on the SOC, but when there was good SOC, the total power was as good as ever and the average MPG was still up there. At 200K, have you ever had the engine tuned up? Spark plugs, air filter, throttle body clean, MAF clean, etc? Part of the problem might be a poorly performing ICE.
     
    #8 FuelMiser, May 11, 2017
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