Chevrolet C1500 engine won't start due to flashing security light, possible key issue on Chevrolet C1500

Some Chevrolet C1500 owners report experiencing difficulties starting their engine when the security light is flashing, indicating a potential issue with the vehicle's Passlock security system. This situation often requires waiting for about ten minutes to see if the flashing light goes off or becomes steady, after which they can attempt to restart the engine. In cases where the security light remains on and the engine does not start, some owners may need to perform a key relearn procedure, which involves specific steps to reset the security system. If the problem persists, it might be linked to common failure items such as the Ignition Control Module, distributor, or fuel pressure regulator, which can contribute to a crank-no-fire condition. Additionally, concerns regarding the wiring or components related to the Passlock system may necessitate seeking assistance from a dealer or qualified technician for further diagnosis and repairs.