Make sure you've thouroughly gone over the steps here http://www.hptuners.com/help/vcm_edi...ters_gm_os.htm in your case its probably either 1 of 2 thingsOriginally Posted by edgZ06
a. you didn't write a 2 or 3 bar custom operating system to the pcm
b. if you DID write a 2 or 3 bar custom operating system to the pcm you probably didn't click the connect button in the scanner which will poll the pcm for all available PID's.