Indicator Light

When the ignition switch is in the ON position, the ESC indicator illuminates, then turns off if the ESC system is operating normally.
The ESC indicator flashes when the ESC system is operating.
If the ESC indicator remains illuminated, there may be a malfunction in the ESC system. When this warning light illuminates, have your vehicle checked by an authorized HYUNDAI dealer as soon as possible.
The ESC OFF indicator illuminates when ESC is turned off using the ESC OFF button.
WARNING
If the ESC indicator is flashing, the ESC system is active: drive slowly and carefully. NEVER attempt to accelerate. NEVER press the ESC OFF button while the ESC indicator is flashing, or you may lose control of the vehicle, resulting in an accident.
CAUTION
Driving the vehicle with tires or wheels of a different size may cause the ESC system to malfunction. When replacing tires, make sure they are the same size as the original tires for this vehicle.
Test yourself
A quick Hyundai Tucson LM quiz: every answer comes with an explanation and a link to the manual page.