To fix this problem, locate the sensor and have it cleaned. Modern vehicles have a hood latch sensor, which triggers the alarm if someone tries to force open your car’s hood.ĭepending on your car’s condition, dust, grime, and debris will very likely collect where the hood latch sensor is located, and this can cause the alarm to go off. Check the car alarm manual for more information. Some aftermarket car alarm systems do also have adjustable sensors. This is often needed on cars like Audi and Volkswagen because their sensors are over-sensitive from the factory, and this can sometimes cause them to go off needlessly. In some car models with a car alarm from the factory, you can program the shock and movement sensors’ sensitivity with a diagnostic scanner. The type of shock and movement sensors you have in your car depends greatly on your car model, and if the car alarm is an aftermarket alarm system installed in your car or a car alarm from the factory. In this case, your car alarm might go off even if a dog or a cat gently touches your car. Sensitive Shock/Movement SensorĪn overly sensitive shock or movement sensor can trigger the alarm. You can test your car battery with a car battery tester or just by using a multimeter to see how good it is and replace it if it is bad. If your car alarm is going off, but you can still start your car without issue, it is most likely something else that is faulty. If you hear the car alarm going off at night and the car battery is dead in the morning, the car battery may be bad. Low Battery Charge or a Dead Car BatteryĪ bad car battery or low battery charge is a widespread reason why a car alarm goes off at night. Here is a more detailed list of the causes of why a car alarm keeps going off randomly: 1. It can also be caused by a faulty hood latch sensor, door lock sensor, faulty key fob, or an incorrectly installed car alarm. The most common reason why a car alarm keeps going off randomly is low battery voltage or an incorrectly set movement sensor. Conclusion Reasons Your Car Alarm Keeps Going Off Randomly
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