Kia Optima Hybrid 2020 Owner's Manual page 220

Features of your vehicle
EV/HEV (Plug-in hybrid)
A corresponding message is dis-
played when a mode is selected by
pressing the HEV button.
Low battery. Maintaining Hybrid
mode (Plug-in hybrid)
This message is displayed when
unable to convert to EV mode even
when pressing the HEV button dur-
ing HEV mode driving due to insuffi-
cient high-voltage(hybrid) battery
level.
Charger Error! (Plug-in hybrid)
This message is displayed when
there is a problem with the charger.
The purpose of this message is to let
you know an error has occurred in
charger itself not in vehicle.
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Low/High System Temp.
Maintaining Hybrid
(Plug-in hybrid)
This message is displayed when
unable to convert to EV mode even
when pressing the HEV button dur-
ing HEV mode driving due to
low/high system temperature.
Switching to Hybrid mode to
allow heating (Plug-in hybrid)
• When the coolant temperature is
lower than 57°F (-14°C), and you
turn the climate control On for
heating, this message will be dis-
played in the cluster. Then, the
vehicle will automatically switch to
HEV mode.
• When the coolant temperature is
higher than 57°F(-14°C), or you
turn the climate control Off, the
vehicle will automatically return to
EV mode.
Wait until fuel door opens
(Plug-in hybrid)
This message is displayed when you
attempt to open the fuel filler lid with
the fuel tank pressurized. Wait until
the fuel tank is depressurized.
✽ ✽ NOTICE
• It may take up to 20 seconds to
open fuel filler lid.
• When the fuel filler lid is frozen
and does not open after 20 seconds
at freezing temperature, slightly
tap the fuel filler lid and then
attempt to open it.