no codes or anything in my old one computer got my cam installed this weekend and put my new bb computer in and need to do the crank relearn get to a place to do it and they tell me i have code 1638 and they cant do the crank relearn cause the truck must not have any trouble codes to do this....can someone plz help me out i need my truck asap and its running and driving like crap. truck is a 2000 sierra