What is the reason why the car alarm sounds and cannot start?
2 Answers
Car alarm sounds and cannot start for the following reasons: Excessive sensitivity of the anti-theft device: The anti-theft device is too sensitive. There is a sensitivity adjustment knob on the vibration sensor of the anti-theft device, and a slight adjustment can solve the problem. Main control door grounding wire failure: Main control door grounding wire failure, commonly known as door switch failure. The car anti-theft alarm is a multifunctional product, not only for anti-theft alarm purposes, but also for remote trunk opening, remote door opening/closing, remote window opening/closing, remote engine starting, and remote engine locking. When the main control door grounding wire fails, it can cause the car alarm to sound and prevent the engine from starting.
When it comes to the car's anti-theft alarm going off and the engine not starting, the most common cause in my years of car experience is the activation of the anti-theft system. When the remote key's battery is nearly dead, the signal fails to transmit, and the anti-theft system assumes a theft attempt, triggering the alarm and locking the ignition. Don’t panic—first, try replacing the remote key’s button battery, usually a CR2032 model, available at convenience stores for around ten bucks. If changing the battery doesn’t work, check if the car’s main battery is low on charge; a voltage below 12V means it’s nearly depleted, requiring a jump-start or replacement. If that still doesn’t resolve the issue, the anti-theft module might have a bug, such as the doors not being properly closed during the last shutdown or a system glitch. Insert the key into the ignition switch and hold the unlock button for 10 seconds to reset it. For more complex issues like loose wiring or a faulty sensor, it’s best to visit a professional shop. Throughout the process, stay calm and prioritize safety—ensure the environment is well-ventilated before attempting to start the car.
