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Thumping upon Acceleration

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by GregC1979, Dec 11, 2017.

  1. GregC1979

    GregC1979 Active Member

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    I'm fairly new to the feel and sounds of the Prius hybrid system and drivetrain. I am noticing in ECO mode a couple seconds after takeoff right where a normal automatic trans would shift, a thump or even two thumps in the drivetrain and was wondering what that was. It's not bad per se but feels strange and doesn't seem natural. Any ideas? Car has 63k on it..very well maintained according to the carfax.
     
    #1 GregC1979, Dec 11, 2017
  2. CLUBGUY

    CLUBGUY Member

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    Just a guess.....
    You may be feeling the ice coming on....
    Viewing the Multi-info-screen may verify this..
     
    #2 CLUBGUY, Dec 11, 2017
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  3. bisco

    bisco cookie crumbler

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    doesn't sound right, where did you buy it, how many miles? shouldn't matter what mode you're in.
     
    #3 bisco, Dec 11, 2017
  4. Bill the Engineer

    Bill the Engineer Senior Member

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    If you are up to speed, you may be feeling the ICE shutting down because you are backing off of the gas pedal to maintain the selected speed. This would be normal.
     
    #4 Bill the Engineer, Dec 11, 2017
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  5. GregC1979

    GregC1979 Active Member

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    It's strange how everyone on the Prius Owner's social media group say the opposite of everything here. I think it's the ICE turning on under acceleration in ECO mode.
     
    #5 GregC1979, Dec 12, 2017
  6. orenji

    orenji Senior Member

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    Based on what you are discribing it sounds like the ICE turning on.
     
    #6 orenji, Dec 12, 2017
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  7. GregC1979

    GregC1979 Active Member

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    Yeah I think it might be, just feels rough. BTW, do you guys have So-Cal Prius meetups?
     
    #7 GregC1979, Dec 12, 2017
  8. orenji

    orenji Senior Member

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    Why yes we do, I usually plan an annual cruise, you just missed one a few weeks ago. I maybe planning another event around the start of the new year. Keep an eye out under events.
     
    #8 orenji, Dec 12, 2017
    Last edited: Dec 12, 2017
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  9. CLUBGUY

    CLUBGUY Member

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    As my previous reply; ice turning off or on can be verified by viewing the multi-info.screen...
    You can then SEE if this is in fact the cause of the THUMP
     
    #9 CLUBGUY, Dec 12, 2017
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  10. GregC1979

    GregC1979 Active Member

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    Also instead of making a new thread, do you guys have any idea why after disarming factory alarm when I open the hatch or any other door the horn toots twice again (after it's disarmed)? Could that be 12v battery getting low or something? It's highly annoying.
     
    #10 GregC1979, Dec 12, 2017
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