I have a 2004 silverado 2500 with the 6.0l v8 with 148000 ecently has started to not crank when you turn the key you can start the truck by bypassing the relay the blower motor is also not working and the trans wont shift out of first. i have had it to the dealership twice and the truck wil start fine and drive ok here for a little while and then the problems will all arise again the abs warning light is on and the service brake system is on and it is throwing the code shift solenoidmalfunction and tcc pressure i figured it must be the pcm so i replaced the pcm and the blower motor worked all warning lights were out and it cranked perfectly until i programed the pass lock to unlock the fuel pump and now its back to the same old thing does anybody have any idea what it could be?