Question-2025 Prius in EV Mode: Reply quickly!

Discussion in 'Gen 5 Prius Technical Discussion' started by iRun26.2, Jun 13, 2025.

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  1. iRun26.2

    iRun26.2 Active Member

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    Vehicle:
    2012 Prius Plug-in
    Model:
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    I am not adding extra stops on the way home. I have always made it home with greater than 10% of my battery remaining (charging only at home, mostly dependent on how fast I drive my 20.6 miles to work and back). I was commenting on sampling the solar charger power at various times in the day (getting in my car, not going anywhere, several times a day just to see how much solar energy it is receiving). What I’ve learned is that it really needs to be direct sunlight to get 185W. Thus, I don’t think I could ever get 6 hours of 185W to make like 5 miles (or wherever some people have claimed ).

    I’m still quite happy getting what I get (3 miles). I think my favorite part is that when I’m driving in sunlight it’s directly helping me use less electricity for the air conditioning to get a longer range.

    I can’t do solar panels at home. I live in a town home and that is against the rules (at least I think it is). When it gets colder and the battery is less efficient I’m sure I will start plugging in at work too (I wish we had electric car charging spots but we don’t. We just a few outlets I’ve been given permission to use). Right now I don’t need to and it is awesome that the solar panel provides a little bit of padding.

    Tonight my family is going to a restaurant that 14 miles from my house and requires me to drive on the interstate. It’s so awesome because my 2012 wouldn’t be able to even get me all the way in one direction on electricity (nor could I drive 65mph without turning on the gas engine). With my 2025 version I can get all the way there and back even with a bit of time on the interstate. This is great fun! I’m almost glad I hit a deer and totaled my 2012 PHEV!
     
    #121 iRun26.2, Jul 4, 2025 at 11:35 AM
    Tolarian Academy likes this.
  2. iRun26.2

    iRun26.2 Active Member

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    I am most disappointed tonight as I used some gas when I was driving on the freeway. I didn’t even know that I did so until I looked at the most recent mpg values. Could I have…

    1) Accelerated too quickly?
    2) Driven too fast?

    Argh! I thought it would be very hard to accidentally turn on the gas motor. I want to burn no gas!
     
    #122 iRun26.2, Jul 4, 2025 at 10:15 PM
  3. Kevin Grant

    Kevin Grant New Member

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    Vehicle:
    2025 Prius
    Model:
    Limited
    Put it in EV mode and that’s it. It’ll still switch but only after the battery is run down.


    iPhone ?
     
    #123 Kevin Grant, Jul 4, 2025 at 10:21 PM
  4. Tolarian Academy

    Tolarian Academy New Member

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    Vehicle:
    2024 Prius Prime
    Model:
    XSE
    If it is in ev only mode the only way for the ice motor to turn on would be to run out of battery.
     
    #124 Tolarian Academy, Jul 4, 2025 at 10:40 PM
  5. Gokhan

    Gokhan Senior Member

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    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    You probably exceeded the maximum BEV-mode speed, which is 84 mph (135 km/h) in both Gen 4 PHEV and Gen 5 PHEV.

    ■Gasoline engine operation in
    EV mode or AUTO EV/HV mode
    Even if there is a sufficient amount
    of electricity remaining in the hybrid
    battery (traction battery) and EV
    driving range (P.155) is being displayed
    on the meter, EV driving
    (driving using only the electric
    motor) may be canceled and both
    gasoline engine and electric motor
    are used depending on the situation
    (EV driving will be returned to automatically
    after EV driving becomes
    possible again).
    EV driving may be canceled automatically
    in the following circumstances*1:
    ●When vehicle speed is more than
    approximately 84 mph (135 km/h).
    ●When power is needed temporarily,
    for example when the accelerator
    pedal is depressed firmly or
    when accelerating suddenly.*2
    ●When the temperature of the
    hybrid system is high.
    The vehicle has been left in the
    sun, driven on a hill, driven at high
    speeds, etc.
    ●When the temperature of the
    hybrid system is low.
    ●When the heater is switched on
    when the outside temperature is
    below about 14°F (-10°C).
    ●When the windshield defogger
    switch is pressed. (P.434)
    ●When the system determines that
    the gasoline engine needs to be
    started.
    *1:The gasoline engine may also
    operate in circumstances other
    than those listed above, depending
    on conditions.
    *2:When driving in AUTO EV/HV
    mode. Even in EV mode, the gasoline
    engine may start, depending
    on the condition of the hybrid
    battery (traction battery).
    ■If “Engine Started to Clean System
    EV driving unavailable” is
    displayed on the multi-information
    display
    EV driving may be canceled in order
    to protect the hybrid system, etc.
    In this case, perform driving with the
    gasoline engine until EV driving will
    be returned to automatically.
    Depending on the conditions, driving
    that combines the use of the
    gasoline engine may continue for a
    short while. However, this is not a
    malfunction.
    ■Conditions in which the gasoline
    engine may not stop
    The gasoline engine starts and
    stops automatically. However, it
    may not stop automatically in the
    following conditions*:
    ●During gasoline engine warm-up
    ●During hybrid battery (traction battery)
    charging
    ●When the temperature of the
    hybrid battery (traction battery) is
    high or low
    ●When the windshield defogger
    switch is pressed. (P.434)
    *: Depending on the circumstances,
    the gasoline engine may also not
    stop automatically in situations
    other than those above.
     
    #125 Gokhan, Jul 4, 2025 at 11:30 PM
  6. Trollbait

    Trollbait It's a D&D thing

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    There are speed limits to EV mode. Plus the system will turn on the engine if it feels a need to protect the battery no matter the mode.
     
    #126 Trollbait, Jul 5, 2025 at 12:17 AM
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