Theft Security System Light won't turn off

Asked by Jul 25, 2016 at 12:06 PM about the 2003 Chevrolet Silverado 1500 LS Short Bed 2WD

Question type: Maintenance & Repair

How can I reset it or make the light go off. The truck is having a hard time
starting. Replaced the battery last year. Is this a battery issue or something to
do with the ignition?? I need help asap please and thank you for any input

2 Answers

Have you had your alternator tested? Most auto parts stores can test it for free.

4,765

This may be the dreaded antitheft security system. Look for a picture on the dash when this happens that says SECURITY or a picture of a car with a lock through it. This a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well. http://www.diy-gm-security.com/ http://newrockies.com/

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