How do i Reset my security alarm on a 2008 Cobalt?

To reset the security alarm on a 2008 Chevrolet Cobalt, insert your key into the ignition and turn it to the "On" position without starting the engine. Leave it in this position for about 10 minutes until the security light turns off. Turn the key back to the "Off" position, then try starting the vehicle. If the alarm still activates, you may need to consult the owner’s manual or a professional for further assistance.