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Your passlock security is activated or failing. 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 by keeping it from starting, or shutting down while driving.

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Q: Why does security light come on and the dashboard lights flash?
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