1. Attachments are working again! Check out this thread for more details and to report any other bugs.

EV mode issue but engine runs

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by lmans66, Oct 31, 2018.

Tags:
  1. lmans66

    lmans66 Junior Member

    Joined:
    Jan 6, 2008
    53
    24
    0
    Location:
    Arizona
    Vehicle:
    2018 Prius Prime
    Model:
    Plug-in Base
    Since we are moving into colder weather, this might just be natural but when I turn on the car and it goes to EV mode, I notice that ''a few times' the engine is running as well, as I can hear it. Also, as I drive, one time it was obvious that the engine was running as the gas mileage was moving down. Is this due to colder weather and just getting the car warmed up, or I have the defrost on or ?

    As an example, The other day I got in the car, EV showed on the dash,...the engine was heard running. It also happened sitting at a light and moving on when changed to green...in all cases it goes away. But the EV mode is on so it shouldn't happen at all, right?
     
    #1 lmans66, Oct 31, 2018
  2. priuscatprimeguy

    priuscatprimeguy Senior Member

    Joined:
    Nov 1, 2016
    2,730
    2,640
    0
    Location:
    Farmington Hills, Michigan
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    If you're using cruise control when temperatures are below 50 f then yes ICE will kick in otherwise it shouldn't kick in mlm

    Posted via the PriusChat mobile app.
     
    #2 priuscatprimeguy, Oct 31, 2018
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,132
    50,047
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    front defrost on = engine running in ev mode
     
    #3 bisco, Oct 31, 2018
  4. lmans66

    lmans66 Junior Member

    Joined:
    Jan 6, 2008
    53
    24
    0
    Location:
    Arizona
    Vehicle:
    2018 Prius Prime
    Model:
    Plug-in Base
    You mean with defrost = ICE ? If EV, ..yes I can see that but that doesn't answer my question. Why would ICE come on in EV mode?
     
    #4 lmans66, Oct 31, 2018
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,132
    50,047
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I mean if you press the front defrost button while in ev mode, the engine will come on.

    There is a list of reasons in the o/m iirc plus the usual ‘and for reasons not listed here’ disclaimer
     
    #5 bisco, Oct 31, 2018
  6. priuscatprimeguy

    priuscatprimeguy Senior Member

    Joined:
    Nov 1, 2016
    2,730
    2,640
    0
    Location:
    Farmington Hills, Michigan
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Because the front defroster requires more heat than what the traction Battery can deliver

    Posted via the PriusChat mobile app.
     
    #6 priuscatprimeguy, Oct 31, 2018
  7. lmans66

    lmans66 Junior Member

    Joined:
    Jan 6, 2008
    53
    24
    0
    Location:
    Arizona
    Vehicle:
    2018 Prius Prime
    Model:
    Plug-in Base
    Yes, that makes perfect sense....and more than likely since the defrost is what needs to come on some of these days.... thanks for the response, jim
     
    #7 lmans66, Oct 31, 2018
    priuscatprimeguy likes this.
  8. john1701a

    john1701a Prius Guru

    Joined:
    Jan 6, 2004
    12,766
    5,251
    57
    Location:
    Minnesota
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    The button serves as an override, for when you need window clearing as fast as possible. When you don't, just stick with the blower option on the climate screen.
     
    #8 john1701a, Nov 2, 2018
(You must log in or sign up to post here.)