1. Faulty Ignition Switch: If the ignition switch is damaged, it may allow the vehicle to start without the key and prevent it from turning off properly. Check the ignition switch for any signs of damage or wear and replace it if necessary.
2. Ignition Lock Cylinder Issue: The ignition lock cylinder may be faulty, allowing the vehicle to start and run without a key. Try moving the steering wheel while turning the key to see if it affects the ignition. If it does, the lock cylinder may be worn or broken and need replacement.
3. Starter Circuit Malfunction: A problem within the starter circuit, such as a faulty relay or wiring issue, could cause the starter to engage without the key. Check the starter circuit for any loose connections, damaged wires, or malfunctioning components and repair or replace as needed.
4. Anti-theft System Malfunction: Some vehicles may have a malfunctioning anti-theft system that prevents the car from turning off properly. Check the vehicle's security system, including the immobilizer and alarm, to ensure they are functioning correctly.
5. Electronic Control Module (ECM) Issue: In rare cases, a problem with the ECM (engine control module) could prevent the vehicle from turning off. The ECM controls various electronic functions in the car, including the ignition system. Faults or glitches in the ECM software might cause unexpected behavior like the inability to turn off the engine.
If you are unable to identify and fix the issue yourself, it is recommended to take your vehicle to a qualified mechanic or dealership for proper diagnosis and repair to safely address this problem and ensure the vehicle's safety and reliability.
