Hyundai Ioniq Hybrid 2020 Owner's Manual page 237

Convenient features of your vehicle
Low/High System Temp.
Maintaining Hybrid mode
(Plug-in hybrid vehicle)
OAEPHQ049834L/OAEPHQ049835L
This message is displayed when the
temperature of the high-voltage
(hybrid) battery is too low or too high.
This warning message is to protect
the battery and the hybrid system.
3-90
Low/High System Temp.
Switching to Hybrid mode
(Plug-in hybrid vehicle)
OAEPHQ049836L/OAEPHQ049837L
This message is displayed when the
temperature of the high-voltage
(hybrid) battery is too low or high.
This warning message is to protect
the battery and the hybrid system.
Switching to Hybrid mode to
lubricate engine
(Plug-in hybrid vehicle)
OAEPHQ049838L
This message is displayed when the
vehicle is automatically switched to
the HEV mode to lubricate engine
while the Engine Start/Stop button is
in the ON position.