If you have the second ignition key's with you try it. If not try this, it takes about 30 min to do. 30-Minute Learn Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to start the engine, then release the key to ON; the vehicle will not start. 3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK Important: Turn the Ignition Switch OFF. The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle. 6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. Without a scan tool you may have momentary starter interruptions while history clears itself. Good luck and hope this helps, keep me posted, be glad to help.
First thing is you have gottin to comfortable with you car....When you start your car you need to keep the key in the start position just a fraction longer. If your engine is known to start up with a bump of the key. If the timeing to let off the key is too soon the security system thinks the car is being stolen.
A ignition switch may be going bad. There are a few other things that can be going bad also....
If your car fails to start and the security light is on here are the steps to get you going again.
First you need not keep cranking the engine, You will only drain your battery and burn up a starter.
Turn you key to the run position and leave it there for around 10 minutes.
After 10 minutes the Security light will stop flashing. And will stay lit.
Next turn the key to the off position for a second or two.
Then start your engine and hold it in the start position just a fraction longer then when you think the engine has started. ....
This should work for most other GM models.
SOURCE: security light came on yesterday... nowy car
Turn key to run position and leave it there for about 10 mins.......or until security light goes out.
Car should start then.
Also......try another key.....the reader in the lock cylinder may like it better.
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