How many miles on it? I had the exact same thing. No noise driving forward but could hear it in reverse and turning the wheel. Sounded like front wheels. Mine ended up being front brakes. Had my front brakes done at dealership and problem solved. A tire store said it might be emergency brake which is why I took it to the dealer to check. As soon as I described sound he said I needed new brakes. The sound is Hyundai's version of brake pad wear indicator.Humming/scraping sound when backing up: both when in reverse and in neutral. Sound changes a bit when turning steering wheel to right. Sound seems to be coming from front drivers side.