Toyota 2010 Prius Owner's Manual page 195

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Situations in which EV-Drive Mode cannot be turned on
The followings are examples of situations under which the EV-Drive Mode
may not be turned on. If it cannot be turned on, a buzzer will sound and a
message will be shown on the multi-information display.
●
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.
●
The temperature of the hybrid system is low.
The vehicle has been left in temperatures lower than about 32 °F (0 °C)
for a long period of time etc.
●
The gasoline engine is warming up.
●
The hybrid battery (traction battery) is low.
The remaining battery level indicated in the "Energy Monitor" display is
low. (→P. 188)
●
Vehicle speed is high.
●
The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
●
The windshield defogger is in use.
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Automatic cancelation of EV-Drive Mode
When driving in EV-Drive Mode, the gasoline engine may automatically
restart in the following situations. When EV-Drive Mode is canceled, a
buzzer will sound and the EV-Drive Mode indicator will flash and go off.
●
The hybrid battery (traction battery) becomes low.
The remaining battery level indicated in the "Energy Monitor" display is
low. (→P. 188)
●
Vehicle speed becomes high.
●
The accelerator pedal is depressed firmly or the vehicle is on a hill etc.
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