Have you done a relearn on the pass-key?
GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it
Try this if the security system is the problem, next time you run into the problem, normally it will either not start or die right away when it's the passlock system, but worth a shot.
Friday, July 25th, 2008 AT 4:57 PM