Hummer H3 anti-theft system intermittently prevents starting, requiring extended wait times and manual key procedures on Hummer H3

Some Hummer H3 owners report experiencing intermittent starting issues related to the anti-theft system, where the engine starts and then dies, necessitating a ten-minute wait before attempting to start again. These problems can stem from the GM Passlock anti-theft system failing to recognize the key, which may block the engine from starting if the key is deemed incorrect. Additionally, owners may notice a warning light illuminating when the anti-theft system is activated. Faults in the anti-theft module or wiring could also contribute to these starting difficulties. Some owners find that performing a reset procedure, such as locking and unlocking the driver's side door, can help stop the anti-theft light from flashing and potentially resolve the issue. In certain cases, the theft deterrent system may disable critical components like the fuel pump or ignition system if unauthorized access is detected, further complicating starting efforts.