I hate to say it, but the problem lies in the anti-theft system. If it ever strands you, turn the key to the run possition and let it there for about 10 minutes until the light goes off. It should start then.
As far as the problem, it needs to go to a dealer to be diagnosed. They are the only ones that have the proper test equipment to check the system. Otherwise, most shops will just start replacing parts. You could try a different key when this happens to see if that helps, but chances are it is internal.
Let me know if you have other questions.
Tuesday, December 28th, 2010 AT 1:59 AM