Passlock system this has been going on over the last three years and now getting worse and is intermittent, when I insert and turn the key something happens making the theft system activate and keeps the vehicle from starting for exactly 10 minutes. Recently I turned the truck off to save gas while I was in construction traffic at a stand still with a concrete barrier on both sides and the truck would not start and the police were going to have me towed, luckily at started at 10 minutes before the tow truck came. In my opinion this can be unsafe in emergency situations if the vehicle is needed for any type of emergency. Below I am pasting something from the web, but it is basically the problem that I and people all over the country are having. "thousands of people are being led in circles by any vehicle with a passlock II system and it is an unsafe problem with these cars that needs to be fixed. It prevents vehicles from restarting in potentially dangerous areas while the vehicle resets and can permanently disable the car if not addressed. The problem lies in a design oversight and cutting a material cost by putting in a cheap component that any basic chemist could tell you would go bad within a year or two. Change your ignition switch contact from nickel to gold plated connectors and oxidation will not cause faulty readings to trick your vehicles into thinking that they are being stolen and shutting off the fuel pumps. Remuneration for individuals impacted by this financial burden for the purchase of your vehicles is also a request as this problem is a gold mine for car mechanics, both GM certified and freelance, to troubleshoot numerous systems before identifying the problem proper."

- San Antonio, TX, USA