I have a '08 chevy cobalt and ive been told the the pcm computer is bad and need to get it replaced. Is there a difference between the ECM and PCM and if there is what s the difference; also i watched your videos on replacing the computer and if there is a difference between the two is there a way of replacing them (ECM or the PCM).

same thing, just different names. Realize it will need reprogramming to work on your car, you can't just buy one and plug it in

ok , but once i get it reprogrammed and plug it in it should work, correct? Also would i be able to get an already programmed computer from a salvage or just buy new ?