The alarm can be set off if the hood,doors,glove box or hatch switches are defective or not fully closed.Could be something out of adjustment or a defective part.The dealer has a diagnostic computer that can check for alarm codes or last switch to trigger alarm.To do a system check ...close all doors...open the driver door...lock with remote...close driver door...the tow alarm switch red light should flash.If it doesn't you have a system problem.