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Attempt to start the car. If it does not start, or dies very quickly after it started, then leave the key in the ignition in the "ON" position and wait 10 minutes. Make sure the security light is flashing. After 10 minutes the security light will stop flashing and either turn off or stay on steadily. When it does, then turn the ignition off, wait 20 seconds and attempt to restart the car.
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Repeat this procedure three times in quick succession without removing the key from the ignition.
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Start the car following the third 10-minute waiting period. The car should start and stay on. If it stays running, then the codes have been relearned and the problem is solved. If the car still does not start then you may need to have all or part of the passlock system replaced
If the security light has come on, that is indicating a problem in the antitheft system. Tho it may be intermittent right now, it can only get worse. Read thru this link, it will help you understand the problem, offer some tips and tricks, and show you some ways to bypass and fix it.
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JustAnswerhttps://www.justanswer.com > GMC Questions
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PASSKEY LOCKOUTRESET GM CARS 1999 UP 1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key.
If this doesn't do it u have a part failure and need to have the dealer test the system.
Leave the key in the on position for 20 to 30 minutes without trying to start the vehicle. In most cases a lose of power to the computer has happened and the security must be reset.
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