Hyundai Ioniq Hybrid 2020 Owner's Manual page 327

Button Position
ON
Press the Engine Start/Stop button while it is
in the ACC position without depressing the
brake pedal.
The warning lights can be checked before
the vehicle is started.
START
To start the vehicle, depress the brake pedal
and press the Engine Start/Stop button with
the shift lever in the P (Park) position.
Action Notice
Do not leave the Engine Start/Stop button in
the ON position when the vehicle is not in the
ready ( ) mode to prevent the battery from
discharging.
If you press the Engine Start/Stop button with-
out depressing the brake pedal, the vehicle
does not start and the Engine Start/Stop but-
ton changes as follows:
OFF → → ACC → → ON → → OFF
However, the vehicle may start if you depress
the brake pedal within 0.5 second after press-
ing the Engine Start/Stop button from the OFF
position.
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