I am in the process of adding a\c to my 01 Silverado 2500hd pcm with a fbody style a\c system. My pcm originally was under OS#12208322. The fbody is OS#12212156, so I went in the tune repository and downloaded and used creidts for a 2002 Silverado 2500hd that has the same OS# for the fbody. I did a system segment swap from the fbody and the Silverdao 2500hd that has the same OS#'s. I went to rewrite my pcm that was orginally the 01 Silverado 2500 OS#12208322 to the 02 Silverado 2500hd OS#12212156. Everything was going fine as far as rewriting the file, my laptop said file complete and then the fuel pump came on and did not shut off like it should have. So after the stayed on constantly, I turned the ignition off. When I turn the ignition back on, the fuel pump stay on constantly and will not start. Also I tried to read the pcm again with the MPVI and it will not read but will just say Detect Protocal Failed. Is it possible you can tell me what the issue is?
Ticket has been submitted.