Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (2022)

The car alarm is mainly to deter thieves from stealing your car. However, more often than not, the car alarm will go off when no danger is nearby.

It is more of an embarrassment than a comfort to the car owner when the car alarm goes off randomly at night. If your car alarm randomly keeps going off, you are in the right place!

The problem usually lies in faulty sensors, faulty key fobs, or an improper car alarm installation.

In this guide, you will find every step to take for all car alarm problems so that you may easily recognize and fix the problem as soon as possible.

Let’s get started with the guide.

Table of ContentsShow

    Faulty Key Fob

    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (1)

    The key fob is a key component (pun intended) of the car alarm. It signals the car to unlock and also deactivate the car alarm system.

    If the key fob is low on battery or has a bug, it may set the alarm when you try to open or start the car.

    Depending on the design of the key fob and the car model in question, it may be possible that the panic button is pressed when trying to unlock or lock the car.

    Make sure there is no dirt on the key fob, as it may cause the panic button to be pressed. Also, a key fob that has been in contact with water or any other liquid may be causing the key fob to fail.

    The best way to test if the key fob is the culprit is simply to try with another one, if available. If the other key fob is functional, then the first one is faulty. If not, the fault is probably somewhere else.

    A faulty key fob can usually be fixed by changing the battery. Sometimes reprogramming is needed, which is usually possible at an authorized shop or dealership. Otherwise, a new key fob must be bought.

    (Video) Car Alarm Going Off For No Reason Or When Unlocking With Key - 5 Causes & Fixes!

    Faulty Sensors

    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (2)

    As time goes by, cars rely more and more on sensors and computers, and car alarms are not an exception.

    The car alarm relies on multiple sensors to detect any unusual activity. This includes door lock sensors, shock sensors, hood latch sensors, air pressure sensors, and much more.

    Any of the sensors may be a potential cause for your car alarm randomly going off. Most would need a replacement, but there are a few steps you should take before deciding to replace a sensor, depending on the type of sensor.

    Door Lock Sensors, Trunk Sensors, And Hood Lock Sensors

    The door lock sensors, trunk sensors, and hood lock sensors may be faulty, causing the car alarm to go off unnecessarily.

    Before eventually changing these sensors, it is recommended to check that each respective compartment is properly closed. It may be possible that dirt or debris is hindering it from closing properly.

    This would mean the sensors are working properly, but the compartment in question may be loose due to dirt or debris. In that case, cleaning it would solve the issue.

    However, in most cars, this would also inform the driver on the dashboard that these compartments are opened, even while driving.

    The problem may also lie with debris or dirt on the sensor itself, which is one of the reasons why you should keep your car clean as long as possible, one of the essentials of proper car maintenance.

    Shock Sensors And Air Pressure Sensors

    Car alarms do not only go off when the trunk or a door opens wrongfully. Air pressure and shock sensors may react to loud sounds, vibrations, or glass shattering, triggering the alarm.

    These sensors are usually causing the alarm to go off when a loud sound is heard, or the car is vibrating for whatever reason.

    Just like the other sensors mentioned, these can go bad too. However, the problem may more specifically lie in the sensitivity of these sensors.

    A sensitive sensor that is too sensitive will cause the alarm to go off for unnecessary things. For example, if your car is parked in a garage with a neighbor with a loud exhaust.

    Another scenario may be that your car is parked close to a construction site or road with lots of traffic.

    (Video) How to fix. Car alarm going off randomly. Easy fix.

    If you suspect that the alarm sensors are too sensitive, the best thing to do would be to visit an authorized auto shop.

    Bad Car Alarm Installation

    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (3)

    Many people opt for an aftermarket car alarm system in addition to the factory one. This may provide additional safety but also problems.

    When installing an aftermarket car alarm, it is important that someone well-experienced does that, as an improperly installed car alarm may go off at any time.

    To avoid any unnecessary problems, the best thing is to buy a reputable car alarm that is installed by professionals, as many things may go wrong when installing a car alarm.

    Bad Car Battery

    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (4)

    A bad car battery can cause many troubles, including making your car alarm randomly go off at night.

    The car battery powers the car alarm, which may alert you that the battery is getting low as the alarm goes off.

    Related:What Size Battery Do I Need? Car Battery Group Size ExplainedBest Car Battery Brands

    If you suspect that the car battery is the problem, the most logical thing would be to change the car battery.

    Luckily, a car alarm going off is not the only indication that the car battery is getting bad. Other signs such as a battery warning on the dashboard, problems with starting the car, dim lights, and more.

    Another related issue may be a problem with the battery terminals. More specifically, corroded battery terminals may falsely indicate a problem with the battery itself.

    If there is a small amount of corrosion, it can be cleaned with appropriate agents. If you do, make sure to be sure of what you are doing and prioritize safety.

    How To Turn Off A Car Alarm

    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (5)

    The only worst thing about a car alarm going off randomly is not being able to turn it off properly. The best thing is to always be prepared, which is best done by reading the owner’s manual.

    If the manual is of little use, here are a few things you could try.

    (Video) Car Alarm Keeps Going Off - How To Fix It

    Lock And Unlock The Car

    Usually, pressing a button on the key fob will be sufficient, but if that is not helping, you may simply try to lock and unlock the car manually with the key.

    In most cars, there is a small mechanical key inside the key fob that is usually hidden.

    Use that key or your regular key if it is already exposed, and try to lock and unlock the car through the driver’s door a few times.

    If the alarm still doesn’t shut down, try starting the car. Sometimes it is even necessary to drive it a few feet.

    Remove The Alarm Fuse

    A more drastic approach is to totally deactivate the alarm by removing the alarm fuse. In this case, the owner’s manual comes in handy as the location of the fuse box is stated there.

    Sometimes the fuse box may be hard to access, therefore, use caution when trying to open it, as you may risk damaging parts around the fuse box.

    When the fuse has been correctly identified, simply remove it, and the car alarm should stop immediately.

    In some cases, aftermarket car alarms will still go off as the fuse is then only used for the factory alarm.

    If that is the case, you may try to locate a small box that usually comes with aftermarket alarms and simply disconnect it.

    Disconnect The Battery

    Disconnecting the battery should only be done as a last resort. As always, when dealing with electricity and the car battery, make sure to be cautious and work with protective gear.

    There is a great guide on wikiHow about how to disconnect a battery safely. It may be that the car alarm works perfectly after being reconnected, but that is a rarity.


    Car Alarm Keeps Going Off Randomly? Here's The Fix [2022] (6)

    Your car alarm can help keep thieves from your car, however, many times, the car alarm can go off by itself.

    In a car that has a factory-installed alarm, the culprit is usually a faulty key fob. Check that no dirt or water damage is present and change the batteries. If you have another key, try it with that one.

    (Video) Hyundai Tucson Alarm goes off during the night

    If the other key fob is also presenting with the same problems, the problem is somewhere else, presumably a faulty sensor or a bad car battery.

    Make sure that there is no dirt or debris around the sensors or at different gaps in doors, latches, and so on. If that does not help, the sensitivity of some sensors must be properly adjusted.

    If you have an aftermarket car alarm, chances are that it has been improperly installed and must therefore be reprogrammed and/or rewired.

    A bad car battery or battery terminals may also be the culprit. If there is a lot of corrosion around the terminals, a simple clean-up will do. Keep in mind that other, more general symptoms are usually present as well.

    If the alarm is going off, there are a few ways to shut it down. The first step should be to lock/unlock the car with the key fob. If that does not work, try to mechanically lock and unlock the car several times.

    In more severe cases, taking the car alarm fuse off or even disconnecting the battery may be a viable option. Do remember to work in a safe environment with appropriate gear.

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    Why does my car alarm keeps going off for no reason? ›

    Some of the reasons your car alarm keeps going off include faulty sensors, low battery, wiring problems, and a broken key fob. It could also be from unevenly closed doors. While an alarm or ECU reset can fix most issues, others may require professional services.

    Why did my car alarm go off in the middle of the night? ›

    The most common reasons for car alarms to go off are: Key fob malfunction. Dirty bonnet latch sensor. Poor alarm installation.

    How do I stop my car alarm from going off inside? ›

    Locking and unlocking the driver's side door can reset the switch and cause the alarm to cease. If the driver's side door doesn't work, try the passenger door. Further, try turning your vehicle on as well.

    What is the most common cause of false alarms? ›

    Excessive dust, spider webs, and loose sensors and detectors can all be the source of false alarms.

    What sets off a car alarm from inside? ›

    Voltage Sensors

    If there is any kind of drop in the voltage, the alarm will be triggered. The static voltage will drop when the trunk or door is opened and the lights turn on, as well as if anyone tries to cut the power or start the car.

    What can trigger car alarms? ›

    Car alarms feature sensors that trigger the alarm when motion or impacts are detected. Vibrations, bumps or movement typically trigger the sensors.

    How do you force a car alarm to go off? ›

    they all should work, but if one doesn't, try another.
    1. try starting your car. ...
    2. hit the panic button (again) ...
    3. remotely lock or unlock the car. ...
    4. use your key to physically open your driver's side door. ...
    5. open the trunk (or use other buttons on the remote) ...
    6. remove the alarm fuse. ...
    7. disconnect the vehicle's battery.
    25 Oct 2018

    How do I reset my car alarm? ›

    Car alarms rely on the electronic component of the vehicle, and disconnecting the battery should both silence the siren and reset your alarm. Open up the hood, locate the battery, and with a wrench, remove the negative terminal. Then reconnect it after a minute has passed.

    Will a car alarm stop on it's own? ›

    Usually, the car alarm keeps going off for 20 minutes. But if your car alarm keeps going off, or will not switch off automatically after 20 minutes, it can cause a noise nuisance to your neighbors. To avoid this you should: have the alarm system serviced and repaired by a competent alarm engineer.

    What are the three 3 types of alert alarm? ›

    There are three main types of fire alarm monitoring systems: ionization, photoelectric, and combination alarms. Below we will discuss each type of alarm and how they can help detect fires.

    What is a malicious false alarm? ›

    1. Malicious false alarm is the deliberate sending or reporting of an alarm for which no such fire or emergency exists.

    What are the four basic types of false alarms? ›

    Most people would answer that there are two types of alarms… there are alarms and there are false alarms. The reality is there are four types of alarms: Intrusion, False, Environmental and Nuisance.

    What is Ghost alarms for cars? ›

    The Ghost communicates with the vehicle's ECU (Engine Control Unit) on the CAN Data circuit, it is totally silent so it does not give away its location. A thief cannot now simply add new key fobs or replace the ECU to steal your vehicle as only the correct data inputted will allow your vehicle to start.

    Can someone trigger your car alarm? ›

    If someone else has opened up your hood without permission or for an unknown reason, be sure to check with them first. If possible, use a remote start-up system not to trigger the security alarm when they open it. If someone has opened your car door without using the keyless entry remote, it will set off the alarm.

    What are the three main ways to disable the vehicle alarm? ›

    Car alarms can be shut off by starting the car, unlocking the car door, or disconnecting the battery. Maintain your key fob to cancel future alarms.

    What to do if alarm goes off in the middle of the night? ›

    If it's a false alarm, simply turn your system off and keep your phone nearby in case your security system provider tries to call. Once you've determined why it went off in the first place, take steps to prevent future false alarms.

    How do I know if my car is in anti theft mode? ›

    Most modern cars have a dash light that indicates that the anti-theft system has been triggered. The icon for the anti-theft system looks like a car and a lock combination. When this light is on and flashing (it will be either or blue), it will indicate that your car's anti-theft system is activated.

    How long will a car alarm go off until it stops? ›

    A typical car alarm should sound for about 30 seconds, though faulty or broken systems can last for as long as 20 minutes, which can cause quite a noisy disruption. A malfunctioning key fob or dead car battery can cause this lengthy alarm.

    Do car alarms drain batteries? ›

    Car alarms installed by the automaker don't usually cause trouble, but aftermarket car alarms are a different story. Installed correctly, they draw a small amount of power and won't drain your battery. Installed incorrectly, they can suck the power right out of your battery.

    How long will car alarm drain battery? ›

    If it goes off constantly, it will drain the battery fairly rapidly. Worse, it CAN drain the battery within only a week or two, even if it's not set. The alarm draws current constantly, albeit it's not supposed to be much. I've measured car alarms that drew 3–400 mA, even if they weren't set.

    How long will a car alarm go off for? ›

    A typical car alarm should sound for about 30 seconds, though faulty or broken systems can last for as long as 20 minutes, which can cause quite a noisy disruption. A malfunctioning key fob or dead car battery can cause this lengthy alarm.

    How long will an alarm keep going off? ›

    Depending on the timeout settings, most modern house alarms will go off for an average of 20 minutes. However, lengths may vary for traditional systems. A homeowner, tenant, or keyholders ability to stop an alarm is limited by the constraints of complex traditional settings that may require manual disabling.

    Why am I sleeping through my alarm all of a sudden? ›

    Subpar sleep quality and not getting enough sleep are the leading causes of sleeping through your alarm. Irregular work hours, stress, and the presence of a sleep disorder are other possible contributing factors.

    What is a toad alarm? ›

    Welcome to TOAD Alarms, the online website for the UK's leading provider of vehicle security systems. You can use our site to search and compare the markets' most popular Car, Motorhome, Motorbike and Vehicle Security Systems which are highly recommended by all Vehicle Insurers.

    How can you tell if a car is surveillance? ›

    Detecting Vehicle Surveillance
    1. Making a U-turn where it is safe to do so.
    2. Making a turn to the right or left (in general, right turns create greater complications for surveillants because of oncoming traffic that might delay a turn)
    3. Going through a traffic light just as it is turning red.

    Can someone hack my car alarm? ›

    Using radio repeaters, relays or phone hacks, hackers can alter the range of wireless keys and even unlock your car doors without the alarm going off. This practice is known as “relay theft”. Thieves use a network of relay boxes near your home, which then receive your key's signals when used.


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