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passlock security is a garbage system installed by GM for like 20 years. It constantly fails leaving cars stranded on the side of the road when they stall or stuck in the driveway or parkinglot when they wont start.. Many things can cause this. 1 or more of three things. The key chip is bad, the ignition cylinder that reads the key is bad, or the TDM (Theft Deterrant Module-computer that reads the info) is bad. All of which can shut down your vehicle. For more info, read my "profile" section on this site. Just click on my name. Way too much info to type everytime i come across this. This is my Expertise and ALL i am on here for. I can answer most any question on subject and help guide you in the correct direction.

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14y ago

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