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Q:

horn started going off after stopping for gas on 2008 Hyundai Tucson

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My horn started blarring for no reason when I stopped for gas. Couldn't get it to stop even after pressing button on key pad. Couldn't start car while horn blarring. Did this three times in a row but finally stopped on it's own. Then I could start my car.
(1) Answer
Your theft deterrent system is giving you trouble. Get it checked by a Hyundai or Mitsubishi technician.
If you want to find a specialist, here's our directory link for you:
https://repairpal.com/directory?address=45044&car_brand_names=Hyundai