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First try another key if you have one.
If that doesn't work then remove the negative wire, wait a few minutes, reconnect and try.
If that doesn't work then you might have broken cable to the ignition switch.
If you are getting a starting disabled message, it's an indication that your security system is rejecting your ignition key. Your car is equipped with the VATS security system which requires a key with a resistor attached (small chip). Over time the sensor inside the cylinder will not recognize the key. Usually a new key will fix the problem. In more serious cases, it's the cylinder itself that's bad and needs replacement.
Your passkey security system is activated. The key has a transponder chip in it, if the ignition doesnt read that signal correctly, your anti theft will kick in to stop a potential car theif. Try turning the key forward like you are trying to start it. 2 clicks forward, for 10 minutes. Then turn it back and forward again and try to start. This may reset your system. If not, Its probably DEALERSHIP time.
The only way to remove a factory security system is to remove the entire car and buy another one. The security system is an integral part of the engine management system. If you disable it, you will not be able to start your engine.
Hello, You probably have failed (broken) wire(s) coming from the ignition lock cylinder to the security system. To repair you need to replace the ignition lock cylinder, a new key with the same resistor. no programming required. Hope this helps