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security light on no crank no start ????? Hook up a professional scanner an see if all the modules on the vehicle communicate . Check for DTC'S - diagnostic trouble code's .
Sounds like you might have more than one issue. The security light will make the vehicle not start, but should still crank and all accessories should still work. If you are sure you have proper voltage in the battery I would check the ignition switch.
This is a very common problem on GM vehicles. The security system is known to fail. Basically when you insert your key, the system checks for certain OHMS resistance. If the system cannot get the correct signal from the key, it assumes the key is incorrect and goes into SECURITY lockout mode. (prevents hotwiring) This has been happening with GM;s for a very long time. There are ways to bypass this now. Read through this page for info, solutions as well.
When the light is on, the security feature of immobilizing car-wont allow starting-is active. Pretty difficult and time-consuming to permanently disable the security system, but some have figured it out and published their research over the internet. If yours gets worse, if the light stays on more frequently, you may want it permanently removed. I think it was a ruse by GM and car makers to add cost, and cause more frequent repair visits, but that just me. Google "disable vehicle security system" or some such, to see results.
Ypur security system is armed, if you was try unlock procedure from owners manual and wont work, its possible that you will need visit your dealer to reprogramming.
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This happens due to a failed or failing antitheft system. When the system cant communicate properly, it will disable your starter or injectors and show the SECURITY light. Go to this link for info and ways to beat this system yourself.
Hello: Make sure the battery cables are clean No corrosion, and tight. If the security light is not flashing when you try to start it, the have a helper hold the ignition switch in the start position and you go under the car and hit the starter (not to hard) near the end that goes into the engine, If it starts then you need a starter. If the security light flashes while trying to start you have a pass key problem
Do you have a keyless entry? You could try to enter your vehicle using the keypad on the drivers side door, This should turn off the anti-theft security.
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