I have been trying to chase this ghost for a few hours now and I was wondering if anyone knew how to fix this. I upgraded to COS3 just fine on the roadrunner and everything was working, then I saved my tune and put the RR in another car with another tune. I went back to my tune and performed a full reflash on the RR to my old tune and for some reason the vin number was 0'ed out. I entered the vin number again and performed another full reflash and when I went to the tuning tool menu to get the pcm info, the vin was still 0. I entered the vin and the os # in the scan tool under file>enter vin and I still have no gm PIDs. What do I need to do?