I just recently tried to read my friends 2000 Gmc sierra 4.3. Flashscan did not recognize it. Now it won't start. I turned the key to run and pulled the ecm bat fuse for 30 sec. THe truck primes because I can hear the fuel pump. I turned it over and it catches and then just cuts off. The lcd screen says security but all the gm trucks i tuned and seen show the same thing. I wouldn't think just because I tryed to read the pcm it would shut down.
I talked to Blacky and he thinks its vats. How can I try to relink vats thanks