Can the pcm go bad because the battery was off for 1 1/2 months? Can you buy a new pcm already program for the car? Or a use one? I was told by the GM shop that it a pcm need to be program by and only by GM. And they need the car to do it. At $125 per hour plus 13 percent tax. For my bike and tracker a got a reman ecm and just put it in and it ran right away.