Hummer H3 intermittent starting issue with anti-theft lock system activation on Hummer H3

Some Hummer H3 owners report experiencing intermittent starting issues related to the anti-theft lock system activation, specifically due to false key detection by the Passlock security system. This can lead to the engine starting briefly before dying, necessitating a 10-minute wait before attempting to restart. To address these problems, some owners find success in resetting the Passlock system by locking the vehicle and waiting before restarting the engine. Common symptoms of a faulty anti-theft system include lack of ignition power, alarms, and flashing lights, prompting some to diagnose the issue further. A potential workaround involves turning the key to the On position and waiting for the dashboard indicator lights to stop before starting the engine, particularly if the security system light is blinking. If issues persist, many owners recommend consulting a professional mechanic or dealership for a thorough diagnosis and repair. Understanding the common causes of anti-theft system failures can also help prevent future issues, ensuring reliable operation of the vehicle.