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

Weird ICE Issue

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by PiPLosAngeles, Oct 28, 2014.

  1. PiPLosAngeles

    PiPLosAngeles Senior Member

    Joined:
    Nov 18, 2012
    1,550
    720
    0
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    I was driving on the freeway on my way home from work yesterday in HV mode with about 11 miles of EV range left, which I was going to use on the streets. I hit some very heavy traffic where we would be stopped for a few seconds and then move a couple of feet slowly enough that I didn't need to press the gas. After about 5 minutes of this the ICE came on and stayed on for about 4 minutes before I manually switched to EV mode and it shut off. The climate controls were off and I still had 11 miles of EV charge. The outside temperature was about 82°F. I can't figure why the ICE would come on while stopped and stay on for several minutes.
     
    #1 PiPLosAngeles, Oct 28, 2014
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,525
    8,428
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    Doesn't the engine come on when the hybrid battery is low? It's all controlled by an ECU, if it needs to charge, it'll charge
     
    #2 JC91006, Oct 28, 2014
  3. SLOW_RR

    SLOW_RR Member

    Joined:
    Jan 13, 2013
    155
    84
    0
    Location:
    Finger Lakes Region of NYS
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Since you were in HV mode, the computer was preserving your 11 miles of EV for you. When you switched to EV the computer will now use up the mileage left in the battery as EV mode. I have had this happen a couple of times. You are still using some battery even sitting still when you are in Ready.
     
    #3 SLOW_RR, Oct 28, 2014
    Tracksyde likes this.
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,132
    50,047
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    that's it!
     
    #4 bisco, Oct 28, 2014
  5. usbseawolf2000

    usbseawolf2000 HSD PhD

    Joined:
    Sep 22, 2004
    14,487
    3,000
    0
    Location:
    Fort Lee, NJ
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    HV mode means charge sustain. EV mode = charge depletion.

    There is some room (about 500 Wh) to play with in HV mode, just like how a normal Prius would work.
     
    #5 usbseawolf2000, Oct 29, 2014
  6. PiPLosAngeles

    PiPLosAngeles Senior Member

    Joined:
    Nov 18, 2012
    1,550
    720
    0
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Strange. That hasn't been my experience with HV mode at all. I can sit in my car for an hour running the A/C compressor without the ICE ever turning on, even in HV mode. I do it all the time.

    Also, if I have 2.0 miles EV range left and switch to HV mode, the PiP continues to draw down the traction battery while the ICE warms up. If I manage to use up those 2.0 miles of EV range before the warmup cycle is completed the PiP will NOT restore that EV charge. The ICE will happily shut off without restoring even 0.1 miles of EV range.
     
    #6 PiPLosAngeles, Nov 3, 2014
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,132
    50,047
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    sounds like a trip to the dealer.:( when i kick in hv mode, it charges the battery while warming up.
     
    #7 bisco, Nov 4, 2014
  8. Squirt

    Squirt Member

    Joined:
    Jun 1, 2014
    204
    47
    0
    Location:
    Los Angeles
    Vehicle:
    2014 Prius Plug-in
    Model:
    Plug-in Base
    Same experience here. If I'm light on the accelerator in HV mode (enough to keep it in the EV range on the HSI), I can use 10 miles of EV charge without getting the ICE to come on.


     
    #8 Squirt, Nov 4, 2014
  9. mmmodem

    mmmodem Senior Taste Tester

    Joined:
    Nov 17, 2011
    2,732
    1,703
    0
    Location:
    Bay Area, CA
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I used to encounter this all the time. The following is pure speculation on my part. I think there are two issues, either the engine gets cold and needs to warm up or there is a set HV range that you can travel without the ICE cycling similar to how the ICE must cycle after 124 continuous EV miles. The reason I don't encounter this issue anymore is that I switch in and out of EV mode. I thus reset the HV range limit if there is one. To avoid the cold ICE issue if there is one, I take opportunity when I am moving to cycle the ICE by pressing harder on the gas pedal. Again, I don't know if my speculation is correct but my fix works for me.
     
    #9 mmmodem, Nov 4, 2014
(You must log in or sign up to post here.)