2000 Chevy K3500 start stop

I've read tons of posts about the security system and passlock on the ignition...but my truck does not have a chip key, as the dealer even looked into the key issue with me. There is no chip or resistor on this thing at all.

So, with that said, I have the identical problem as the passlock system people do. The truck will start, then stop, and the security light flashes at me. That's the last thing I want flashing me at 6am when I'm trying to leave for work.

It only happens about once every 2-3 months, but I want to eliminate the problem as I have a feeling one day it's not going to start on me and then the real problems will start...

Any ideas?

Thanks for looking!

It did it again yesterday, where we were stuck for 20 minutes waiting for the truck. Is it possible that replacing the ignition switch may solve the problem?

i have a 2000 c3500 crew cab daully that kept shuting off on me had the ignition swich replaced and have not a problem sence but the security light never came on or any light for that matter i hope this help's.