Hi, I have a 05 GTO in the shop. After flashing the pcm I have a issue with intermittent no start. When it does not start the check engine light will stay on when the key is turned off. The key has to be removed from the ignition then after about 30 seconds it will go out. The theft system light will remain flashing as well. I have relinked the bcm to pim and pcm to pim. i have done a theft relearn as well. All of these using a tech2.
After several key on key off cycles it will eventually start as long as you get it at a time when the check engine light did not remain off during power down(key Off). it is not setting any codes. Oh yeah, replaced pcm, pim, and bcm still have same problem. Thanks.