I have a 2002 3500 that the ecm went out it does not know how to read apps and reads 40psi of boost with KOEO 'NICE' sent ecm to NAPA was sent back non fixible. here is my question are the ecm year and truck specific and where can i get one for under 1500. 00 plus tow truck to dealer for reflash sorry for spelling do this with 2 fingers thanks.