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Prius EV Mode

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EV-only mode is auto canceled outside of the following limits:

  • >=180V
  • >=45% SOC 2 Bars (mode cannot be entered unles SOC is >=50% 3 Bars)
  • Accelerator pedal position <=120 (out of 255), corresponds to approx. 120A or 24kW
  • Vehicle speed <34 mph (55 kph)
  • Defrost not selected (and possibly some other control selections)


  • The ICE will start 7 seconds after vehicle startup unless EV-only mode is entered during that time.
  • Once the ICE starts the first time during a trip, it will not stop until it has warmed up.
  • The A/C compressor is electric, and the A/C will work while in EV-only mode.
  • When the EV-only mode is entered, the hybrid model screen will show. A beep will be heard only if that screen wasn't already showing.
  • Three beeps are heard whenever EV-only mode is requested but not allowed, and when it is auto canceled.
    One must wait around five seconds before a new EV-only request is acknowledged.

Regenerative braking is limited by all of the following:

  • 120A
  • ~30A if SOC is >=80%
  • HV 250-270V (progressively greater limitation)

None of the above voltage limits have been tested for temperature-based variations.

See Prius EV Mode Button for instruction on it's installation.