Question about 2003 Chevrolet Monte Carlo
The security, antitheft, or passlock light is 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, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.
Posted on May 13, 2013
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Posted on Jan 02, 2017
hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.
Posted on Sep 07, 2008
no not a typical ignition problem. sounds like bad connection. yes check cables first. then check under hood fuse box. check engine ground. check little red box under hood by battery. check start cable connections. nice truck sorry to hear of the problem
Posted on Dec 31, 2009
COULD BE ANTI THEFT SYSTEM, BAD IGNITION? I HAVE A CADI BUT GM HAS HAD ALOT OF PROBLEMS WITH ANTI THEFT SYSTEM THAT SHUTS DOWN FUEL IGNITION AND STARTER GOOGLE IT YOU WILL SEE LONG LIST WITH GM GOOD LUCK.
Posted on Apr 13, 2010
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