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Problem getting into EV mode

Discussion in 'Prius PHEV Plug-In Modifications' started by Rich London, Feb 19, 2012.

  1. Rich London

    Rich London New Member

    Joined:
    Feb 18, 2012
    20
    3
    6
    Location:
    Charlotte, NC
    Vehicle:
    2009 Prius
    Model:
    Two
    Is the issue I'm describing below normal behavior, or hopefully something that can be fixed?

    I have a 2009 Prius with an Enginer 4kwh battery pack. I know that the Prius' programming has a number of parameters that control when it will enter EV mode.

    The display says "Cannot enter EV mode now" when engaging my Coastal EV mode switch at times when I believe it should be able to enter EV mode.

    Here are the conditions from a recent trip:
    Stopped at a light
    The ICE not running
    Car fully warmed up (just drove 10 miles)
    AC off
    Outside air temp 62 degrees
    Battery showing green bars with the top bar white

    If I enter EV mode when the car is started cold then it works fine. Once I've driven it a while I can't get it to return to EV mode reliably.

    The last time I spoke with my local Toyota dealer they said that because the 2009 American Prius was not shipped with an EV mode switch they would not support that mode.
     
  2. seilerts

    seilerts Battery Curmudgeon

    Joined:
    Mar 7, 2010
    3,326
    1,512
    38
    Location:
    Santa Fe, NM
    Vehicle:
    2005 Prius
    It is possible that SoC is too high and/or the battery is too hot. Do you have a ScanGauge? Can you monitor SoC and battery temperatures?
     
  3. Rich London

    Rich London New Member

    Joined:
    Feb 18, 2012
    20
    3
    6
    Location:
    Charlotte, NC
    Vehicle:
    2009 Prius
    Model:
    Two
    I just ordered a Scangauge. Looking forward to using it to troubleshoot.