Cadillac CTS anti-theft system preventing car from starting despite new battery, starter, and key fob on Cadillac CTS

Some Cadillac CTS owners report experiencing issues with the anti-theft system that prevents the car from starting, even after replacing the battery, starter, and key fob. These issues may arise if the anti-theft system needs to be disengaged or reset, particularly if the door lock cylinder is damaged or the key fob battery is dead. Additionally, the theft deterrent system may require reactivation to allow the vehicle to start, as it can disable components if unauthorized access is detected. Some owners have encountered software bugs or glitches that trigger dashboard warning lights without any actual problems. In certain cases, a manual override can be attempted, but it is advisable to seek assistance from a dealership or GM performance shop for a permanent solution. If the key fob is malfunctioning, consulting the owner's manual for instructions on starting the vehicle with a low transmitter battery may be necessary, and using the physical key to unlock the driver's door can help reset the anti-theft system.