- Dead battery: If the car battery is dead, the ECU (Engine Control Unit) won't get enough power to start the engine and the security system won't be able to disarm itself.
- Faulty alternator: If the alternator isn't functioning properly, it won't be able to charge the battery and the car won't start.
- Bad starter motor: If the starter motor is faulty, it won't be able to engage the engine's flywheel and start it.
- Faulty ignition switch: If the ignition switch isn't working properly, it won't be able to send a signal to the starter motor to start the engine.
- Faulty security system: If the security system is faulty, it won't be able to disarm itself and allow the car to start.
