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Why Does My Car Alarm Keeps Going Off?

Sometimes, the car alarm keeps going off for apparently no reason. It’s a common problem for the city dwellers. More than 90% of the times, the car gives false alarms. It could be a passing van or a dog jumping on the hood triggering that deafening, maddening sound.

Why does this happen? Well, there could be various reasons. Knowing about them will help you get rid of this annoying problem.

Why Car Alarm Keeps Going Off?

Learn about five causes that make car alarm going off for no reason, apparently. We’ve also suggested some solutions so that you don’t have to pay a visit to the servicing shop.

Malfunctioning Key Fob

The key fob is a small plastic controller that ensures a secured access to your car. It also unlocks doors and jumpstarts the ignition system. You can say goodbye to the traditional locking and unlocking the car door with a key because the key fob lets you do it with the push of a button.

car alarm going off for no reason
Changing the fob’s battery could be the solution.

A malfunctioning controller cannot send the signal properly to the alarm system, resulting in car alarm going off for no reason. You can change the battery, reset the fob, or scan with a code reader to solve the problem.

Unclean Hood Latch Sensor

When the hood latch sensor collects much dirt from road grime and engine grease, it does not function properly. Then, it often triggers a false alarm. The sensor is an effective device that protects your vehicle from theft and damage. It also prevents unintended hood opening. So, you should keep it clean for not only keeping the annoying alarm sound at bay but also enhancing the car safety. Use a brake cleaner and cleaning brush to clean it.

Poor Connection of the Hood Latch

If the car alarm keeps going off even after cleaning the hood latch sensor, the problem could be a defective hood latch connection. It can also set off false alarms because the sensor cannot respond properly to the given commands. This issue could also affect the control unit, leading to showing incorrect readings such as turning the airbag light on when there is no real problem with the airbag function.

The sensor is located near the headlights. Disconnect it and then connect it again to make the connection work.

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Low Level of the Battery

One of the functions of the alarm is to warn about low battery levels. If you try to switch the engine on with a dying battery, the alarm will go off. You should check the battery with a voltmeter if the car alarm starts clamoring without any evident reason. The battery needs a replacement if the reading shows less than 12.6 volts.

car alarm keeps going off
Test the car battery to see if it is running low.

Rusty Battery Terminals

It’s another reason for the car alarm keeps going off. Due to the worn out terminals, the battery cannot supply enough power to different car parts. The alarm sensor can interpret the condition as low battery and set off to warn you about it.

4 Comments
  1. Leon says

    Is it possible for a dealer to trigger a false car alarm from a remote location in order to get you to come in for an inspection, and to perform non warranty repairs? I’ve had these false alarms on two New Cars. The current model has less than 1,000 miles. My problem occurs two or three times a day, and it reoccurs in about three or four days. On my previous car it kept occurring for a few weeks, I ignored it and it eventually went away.

  2. Leon says

    Is it possible for a dealer to trigger a false car alarm from a remote location in order to get you to come in for an inspection, and to perform non warranty repairs? I’ve had these false alarms on two New Cars. The current model has less than 1,000 miles. My problem occurs two or three times a day, and it reoccurs in about three or four days. On my previous car it kept occurring for a few weeks, I ignored it and it eventually went away.

  3. Meena says

    @ Leon.

    No, it is far more likely you are leaving your vehicle in an area where there is poor signal. It might only take you parking your car a couple of feet away from where it is to fix it!

  4. S.Sherman says

    My Velsoter’s alarm kept going off due to a short door sensor (the pin in the door jam that is pressed in when the door shuts). This also kept draining the battery. The fix was to add plastic to that sensor (I used a polymer pen where you add liquid then harden it with UV light, another option is to add something to the door where the sensor hits when closed, even a couple pieces of magnet tape would work) to make up for the microns of extra space needed for the sensor to register the door being closed. If you get the open door sensor going off when you drive, there’s your sign.

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