[wachuku]

egheorghe I've messed around a lot with my "radio" (which I like to call head-unit), and although I can't provide a definitive answer, if I remember correctly I believe that yes radio anomilies can result in a U1255 code. I believe I get such a code if for example I operate the car with the radio removed. Maybe your radio has a bad internal connection or maybe the electrical connector is loose.

Perhaps the others can offer further insights.