JAZAuto
Newbie
Regarding the 04 Grand Am, once the lock cylinder/Passlock module was replaced (it's one unit), the BCM had to be reprogrammed by the dealer with a Tech 2 scanner, (which I believe also connected to a security database through the internet). My Auto X-ray reads just fine now when I check the car. During this no-crank problem the code reader said it could not establish communication with the PCM.