Your car won't start: If your car won't start, it could be a sign that there is an issue with your ignition system. The engine cranks but won't turn over: If your car's engine cranks but won't turn over, it could be a sign of a faulty ignition switch. The engine misfires: If your car's engine is misfiring or running poorly, it could be a sign of an issue with your ignition system, such as a faulty ignition coil. The key is stuck in the ignition: If your key is stuck in the ignition, it could be a sign of a faulty ignition lock cylinder. The key won't turn in the ignition: If your key won't turn in the ignition, it could be a sign of a faulty ignition switch or lock cylinder.