Ok, heres your info on this. DEPENDING on what school you go to depends on how many credits you have to achieve for a diploma or a degree. 55 credits sounds lil short of a 2year Degree so im guessin it is a diploma course. I go to Dakota County Tech here in minnesota and its 64 credits just for a 2year Diploma here. I am in heavy duty truck technology or "diesel mechanics" also.