- Key is not programmed.
- Loose battery cable connection.
- Faulty ignition switch.
- Faulty theft deterrent module.
- Faulty wiring.
Possible solutions:
1. Reprogram the key. This can be done by a locksmith or a Cadillac dealer.
2. Tighten the battery cable connections. Make sure that the positive and negative cables are both securely connected to the battery terminals.
3. Check the ignition switch. If the ignition switch is faulty, it will prevent the car from starting. You can check the ignition switch by turning the key to the "ON" position and seeing if the dash lights come on. If the dash lights do not come on, the ignition switch may be faulty.
4. Check the theft deterrent module. The theft deterrent module is responsible for preventing the car from starting if it detects a theft attempt. You can check the theft deterrent module by looking for a flashing light on the dash. If the theft deterrent module is flashing, it may be faulty.
5. Check the wiring. If the wiring to the theft deterrent system is faulty, it can prevent the car from starting. You can check the wiring by looking for any loose, damaged, or corroded wires.
Note: If you are not comfortable performing these tasks yourself, you should take your car to a qualified mechanic for diagnosis and repair.
