ICE Starts in EV Mode with 6 miles left on Traction BAttery

Discussion in 'Prime Main Forum (2017-Current)' started by renoblueprius, Dec 4, 2020.

  1. renoblueprius

    renoblueprius Junior Member

    Joined:
    May 23, 2010
    4
    1
    0
    Location:
    Reno, Nevada
    Vehicle:
    2021 Prius Prime
    Model:
    XLE
    I have been driving my 2021 PP XLE for about two months and am very satisfied.

    I have noticed 2 times now that the ICE has started in EV Mode with between 6 and 14 miles left on the Traction Battery. The outside temperature is around 48 deg F. It has happened after returning from a hike. The last 2 miles of the drive home is a 2 mile mild downgrade so the battery is charging most of the way. The ICE starts near the end of the downgrade.

    Is this normal?
     
  2. schja01

    schja01 One of very few in Chicagoland

    Joined:
    Apr 22, 2005
    1,338
    919
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    Mine did the same thing with 20+ miles left on the traction battery. That was 3 days ago. Temp was in the low 40’s. A mystery.
    EV
    Eco heat
    Eco drive mode
    No defrost
    It’s as if the car felt it needed to warm up the ICE. Lasted less than 5 minutes.
     
  3. Db17

    Db17 Member

    Joined:
    Jan 9, 2017
    150
    64
    0
    Location:
    Visalia, CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    The computer knows best ;)
     
    Northerner likes this.
  4. Diemaster

    Diemaster Active Member

    Joined:
    Oct 31, 2017
    264
    242
    2
    Location:
    so. cal
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    simple.......if you dont want the ICE to start just unplug the injectors. sure you'll get a christmas tree- lit dash but no gas will be used. :p
     
  5. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    41,912
    13,470
    41
    Location:
    Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Technology
    Were you using B mode during that 2-mile downhill?
     
    AldoON likes this.
  6. renoblueprius

    renoblueprius Junior Member

    Joined:
    May 23, 2010
    4
    1
    0
    Location:
    Reno, Nevada
    Vehicle:
    2021 Prius Prime
    Model:
    XLE
    Yes I was in B Mode for the last mile
     
    AldoON likes this.
  7. AldoON

    AldoON Junior Member

    Joined:
    May 24, 2020
    94
    64
    0
    Location:
    Milton, ON
    Vehicle:
    2018 Prius Prime
    Model:
    Upgrade
    There is a downhill shortly after leaving work. In the summer I never had a problem with the ice kicking in while in B mode.
    The other day it was around 0 C and the ice kicked in on the hill. Now I avoid B mode and use light brakes. So far been good for no ice.

    I charge at work so my battery is at 98-100 percent going down the hill.
     
  8. Gokhan

    Gokhan Active Member

    Joined:
    Oct 5, 2008
    904
    407
    0
    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    In other words the state of charge (SOC) of the traction battery drops to 0% when there is still a lot of estimated EV range left.

    Of course, this is normal. The estimated range is a guess only. You need to keep an eye on the SOC. You can see the SOC if you switch to the eco gauge on the multifunction display (MFD).
     
  9. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    41,912
    13,470
    41
    Location:
    Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Technology
    I have noticed when it's cool (cool, not cold.. so yeah 50°F is about right), shifting into B for regen instead of using the brake pedal sometimes kicks the engine on. It did that to me once on a short, but steep hill. I thought "oh, I'll just go into B down this hill to maintain speed instead of riding the brake pedal" and it kicked the engine on instead.

    However, the difference is that mine is a steeper hill and you said yours was a mild or gentle one.
     
  10. schja01

    schja01 One of very few in Chicagoland

    Joined:
    Apr 22, 2005
    1,338
    919
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    Fwiw in my case no B Mode. The ICE “just started, warmed up and shut down” for no apparent reason. I have been driving less due to COVID so perhaps it thought it was time to exercise the ICE?
     
    Trollbait likes this.
  11. AldoON

    AldoON Junior Member

    Joined:
    May 24, 2020
    94
    64
    0
    Location:
    Milton, ON
    Vehicle:
    2018 Prius Prime
    Model:
    Upgrade
    In my case I was on a steep hill too.
     
  12. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    16,164
    7,517
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    That could be likely. A PHEV can't go indefinitely on EV alone; problems will start coming up with an engine that is never exercised.

    I believe other PHEVs would give a message about that being a case though.
     
    schja01 likes this.
Loading...