Honda CLARITY Fuel Cell 2021 Owner's Manual page 426

uuWhen DrivinguFC System in Extreme Cold-weather Conditions
On cold days, you may get sprayed with exhaust water if standing behind the vehicle
when:
• The FC system is idling until the READY indicator comes on at power system
start-up.
• The FC system is in the shutdown process after it was stopped before warm-up is
completed.
High Voltage battery is warmed up using the air inside the vehicle. If the air
conditioner is not used or a window is open, it may take time to complete warm-up.
As a result, the power output may be limited or the READY indicator may take
longer than usual to turn on.
When the power system is turned on in extremely cold temperatures (–4°F [–20°C]),
its standby operation noise may become louder than in normal low temperatures.
424
1FC System in Extreme Cold-weather Conditions
It may take a longer time to start in very cold
conditions or may not start at all until temperatures
rise.
If the temperature of the fuel cell or the High Voltage
battery drops below –4°F (–20°C), the fuel cells will
not operate and, as a result, the vehicle will not start.