Why auto alarm does not let me start car?

An auto alarm may prevent your car from starting due to a security feature designed to deter theft. If the alarm system detects unauthorized access or a malfunction, it can trigger the immobilizer, which cuts off power to the ignition system. Additionally, a low battery in the key fob or a malfunctioning alarm system could also cause this issue. To resolve it, try resetting the alarm or consult your vehicle's manual for troubleshooting steps.