Hyundai Sonata Hybrid 2017 Owner's Manual page 173

Convenient features of your vehicle
Check regenerative brakes
This warning message illuminates
when the brake performance is low
or the regenerative brake does not
work properly due to a failure in the
brake system.
In this case, it may take longer for the
brake pedal to operate and the brak-
ing distance may become longer.
3-70
Check Virtual Engine Sound
System
This message illuminates when
there is a problem with the Virtual
Engine Sound System (VESS).
In this case, we recommend that you
have your vehicle inspected by an
authorized HYUNDAI dealer.