When driving I turned the vent fan off, a few seconds later, it turned itself back on. Next day I turned the car off, turned the radio off, opened the door to get out, the radio turned itself back on. Another time, pushed key fob twice to lock doors, no horn sound. We took car to local service department, no codes showing, so nothing they can do. Disgusted with this car. Between the defroster blowing cool air instead of warm , and now this, we have a new car, and have so much going wrong with it, and nothing can be done. Will never buy a GMC product again!