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ICE doesn't stop when parked, possible battery issue

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Mellow Grey, Aug 29, 2018.

  1. Mellow Grey

    Mellow Grey Junior Member

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    Hello,

    I noticed a few days ago that my ICE doesn't stop for several minutes, if at all, after driving and stopping somewhere such as a parking lot. I've been looking for answers and have checked the fans (still blowing) and the diagnostics mode. Batteries aren't too hot as far as I know, but the diagnostic screen showed the battery at 11v when in ACC mode (after driving, so it was probably higher than it actually is). It jumps to about 13.4v when driving. The car runs fine aside from when the ICE doesn't want to stop. I was going to check it again when I got home but it wasn't going into diagnostic mode for some reason.

    Anyway, my questions:
    1) Is this a normal voltage? If so, what else could be the problem?
    2) Why can't I get back into diagnostic mode?
    3) I've been looking for a guide as to how to reset the car's systems after swapping out the 12v battery but haven't seen any posted. Is there a guide someone can link me?

    I appreciate any help in this matter. Thank you for your time.
     
  2. bisco

    bisco cookie crumbler

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    how many miles on her?

    would probably be more helpful to put a voltmeter on the 12v when it is stone cold. is it original?
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    I'm always a little mystified by the various 12 volt readings done through the car's displays. Try measuring with a digital volt meter, with the car off, either at the jump point or directly at the battery posts, after the car's been off for several hours, and post what you get?

    If it's still around 11 volts, that's near-dead. A semi-healthy battery would be 12.5 or better (measuring by the above method). 12.6 good. 12.7 or higher really in the pink.

    For a better assesment, you want to test both the voltage and the Cold Cranking Amps. There's electronic load testers that can do that. Most automotive retailers selling batteries would have one and could test the battery likely for free. Dealerships too would have these, but more likely to charge you something. You can get a DIY level tester, Solar BA5, BA7 are examples, there's lots of others now.
     
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  4. Grit

    Grit Senior Member

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    After driving 12v should not be in 11v range. Your 12v bat needs to be changed, not charged.
     
  5. bisco

    bisco cookie crumbler

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    well said mendel, i couldn't get my fingers to type that much.
     
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  6. Raytheeagle

    Raytheeagle Senior Member

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    Do you ever type that much in one post:p?
     
    #6 Raytheeagle, Aug 29, 2018
    Last edited: Aug 30, 2018
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    For typing, and deep content as well, @BuickGN is the Stephen King of PriusChat.
     
  8. bisco

    bisco cookie crumbler

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    because of my add, i don't read other posts longer than a short paragraph, so i figure no one wants to read mine either.
     
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  9. The Electric Me

    The Electric Me Go Speed Go!

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    That's a bit of a rant and/or pet peeve of mine.

    First of all, I enjoy writing.

    But it seems to me we live in an age with some of the most fantastic tools of communication that have ever existed. And yet, nobody wants to to communicate in anything but short sentences and sound bite length.
    I kind of hate that.

    I've gotten, not so much in Prius Chat but other forums I participate in, the TLDR response.
    And it saddens me. When I look at just at most a few paragraphs, and think..this is 30 seconds of reading..maybe at most a minute or so? And this has become "Too Much" for people to want to absorb?

    People use to hone the skill of writing letters back and forth. Letters that often took enormous amounts of time to be conveyed back and forth.
    We now live in a time when personal opinion and communication can be instantaneous. But oddly, now we have diminished our attention spans to short sentences and emoji's.
    I can't think this is a good thing.
     
  10. bisco

    bisco cookie crumbler

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    i suppose 'chat rooms' aren't the perfect place for tomes, but i have seen a lot of compliments on your writing ability.
    so, people are definitely reading your posts!
     
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    I have the same issue. It's funny though, some text, I can read forever, come back for seconds. That Honda Fit feller, for example.

    OTOH, BuickGN's tomes have me nodding off: lot's of good info but holy heck they're biblical slabs.The guy seems very knowledgable/smart though, and probably typing at least 60 words per minute.
     
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  12. Mellow Grey

    Mellow Grey Junior Member

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    For anyone still here to help, I went to the dealership and got the battery replaced, but the voltage in diagnostic .is still showing the same numbers. Any suggestions? I'm holding out that the ICE won't do the parked-running thing and if it doesn't I'll be happy, but for now these numbers are going to bother me.
     
  13. bisco

    bisco cookie crumbler

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    the 12v might need a charge before installing, the car does not make a good charger, more of a maintainer.

    go back to the dealer and ask them to test it, or go to an auto parts store, they test for free.
     
  14. Grit

    Grit Senior Member

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    Nor care about spelling, "because of my add"

    :ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:
     
  15. Grit

    Grit Senior Member

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    Return to store & exchange it for one that's 12.7 volts from the shelf, have them test it right then and there. Buying a new off the shelf battery that's below 12.7 volt will get you back to square 1 problem. Old battery was lower in voltage in the first place.
     
  16. The Electric Me

    The Electric Me Go Speed Go!

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    Sorry, didn't mean to hijack your thread.
     
  17. CR94

    CR94 Senior Member

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    Any chance this "doesn't stop" issue occurs upon parking shortly after a large downhill? If so, that's merely the way your Prius gets rid of excessive battery charge.
     
  18. Mellow Grey

    Mellow Grey Junior Member

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    It wasn't from a hill, one of the first times I noticed it was at night when I went down the street to the grocery.

    I'm at the dealership now, battery tested at 12.7v, but diagnostic is still reading 11.6v, so unless there's something I don't understand I'm probably just an idiot. The ice running has stopped though.

    Edit: unless I've been an idiot this whole time... Could the diagnostic system be showing the hybrid battery instead of the 12v?
     
    #18 Mellow Grey, Sep 5, 2018
    Last edited: Sep 5, 2018
  19. bisco

    bisco cookie crumbler

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    no, the hybrid battery is a couple hundred volts. sounds like your 12v battery is failing under load.
     
  20. Mellow Grey

    Mellow Grey Junior Member

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    What could be causing it to fail under load?