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How to Repair Car Key Fobs

Even though we test them many a times, key fobs are not indestructible. They can break down in various ways.

The most frequent issue is the battery being dead but other issues can be more serious. Fortunately, many of these can be fixed by a simple DIY fix at home.

Dead Battery

A dead battery is the most common reason for a key fob that is not working. Fob batteries can be drained quickly, particularly if they're exposed to extreme conditions like humidity, temperatures or even water. It's a good idea keep an extra fob battery in your wallet just in case.

You can usually tell the moment your car key fob's battery is running low by the fact that the LED light will cease to glow. The fob may also stop working at the same distance it used to. In this instance the key fob might require reprogramming or replaced entirely.

Fortunately the replacement of the battery in a car key fob is simple. First, you need to determine the kind of battery is used. The type of battery should be engraved on the side of your key fob. If you're unsure, a quick Google search can help. Once you've found the battery type and the key fob, you can open it near the seam. You will need to use small flathead screwdrivers or your fingernail to pry the two halves apart. Remove the old battery and replace it with a new one. Then, insert the new battery so that the positive (+) face is facing the buttons on the fob.

Some drivers may not be aware their fob is dead until they attempt to lock or unlock their car and the buttons don't respond. This can be corrected by reprogramming the fob. However, it can be time-consuming and expensive. Another option is to contact roadside assistance and see if they can jump your car and get you back on the road.

If you've tried both solutions and your car still doesn't start, it's the right time to call a professional. A trained technician can tell the computer in your car needs reconfiguring, or if your key fob is only in need of replacement batteries. They can also recommend a reputable auto repair shop to replace your fob's keys. Sometimes it is possible that a new fob could be the best option.

Damaged Circuit Board

Key fobs can withstand many physical abuses and isn't indestructible. The battery, circuit board and buttons are all subject to wear and wear and tear. auto key repair near me is important to take care of these components to keep your key fob in good working order.

The easiest way to test is to ensure that the battery inside the key fob isn't dying. Replace the battery to determine if it resolves the issue. If this does not work, you may need to open the fob and clean the contact surfaces. It isn't easy to open some key fobs since they do not have an easy-release mechanism. You could damage your fob by trying take it apart. You can purchase a special tool to open your key fob, but you must always adhere to the manufacturer's guidelines to avoid damaging it.

Another issue that is common is a damaged or corrupted circuit board in the key fob. This can be caused by many things like dirt or moisture that gets into the battery compartment software problems, or even an accidental firmware update. If your key fob has stopped functioning completely, you should think about having it reprogrammed by locksmiths who specialize in this kind of work.

Radio interference is a different possibility. It could happen if are other wireless devices that transmit at the same frequency as your key fob, like radar detectors or home security systems. If this is the case, inquire with the other manufacturers of the device to make sure that your key fob's signal isn't affected by their signals.

There may be a need to replace a switch or an electrical component of your key fob. You can find online guides that will show you how to fix this yourself. Be cautious when you do this because the circuit boards inside the key fob are tiny and easily break in the event of rough handling. If you're doing this yourself, be sure to use an SMT switch that is of high-quality and solder the switch in place correctly.

Out Buttons Out Buttons

Car key fobs can get lots of wear and tear. They're prone to being dropped and often spend a lot of time jostled around in your purse or pocket. Sometimes, this jolting can cause buttons to wear out or become stuck. When this happens, a simple adjustment may be all it takes to restore the button's functionality.

Modern key fobs come with sensors that are able to detect when they've been pressed. They're made to do this because they can help lower the risk of someone stealing your car. If your key fob's buttons don't respond when pushed this is a sign that they're worn-out and need to be replaced.

The circuit board inside the key fob also sends signals to your car. These signals include commands to unlock and lock your car, and commands to start the engine. If the internal circuit board is damaged, your key fob will not unlock or start your engine. This type of damage is typically caused by blunt force or water.

You'll notice that the buttons on your key fob are wearing down if you find yourself pressing more than usual to get them to work. The fob may not be sending signals to your car or have a smaller range.

If you're unable get your key fob to unlock or start your car, you need to find a locksmith near you immediately. They'll be able to determine whether the key fob is damaged or your ignition cylinder has worn out.

Fortunately, the majority of car keyfob problems aren't complicated or serious. The best way to avoid being surprised by a malfunctioning key fob is to keep a spare in your possession at all times. This will ensure that you're not left stranded somewhere due to a lost or malfunctioning key. If you have lost your spare key, a professional locksmith can rekey it to work with your car's engine. They'll also be able fix any internal damage that has occurred on the key fob.

Broken Case

The case of a key fob does more than protect the buttons and batteries. The case also houses the circuitry that executes all the electrical magic when you press the button on your key fob. The board transmits the signal from your keyfob to your car.

If the board is damaged or dead the key fob won't be able to operate. Sometimes, a key fob that is dead may need to be reprogrammed, which is something your local auto locksmith or dealership can help you with.

Another reason why your key fob might not be working is because the batteries are dying. The battery can be replaced at home. The positive side is that you can locate the replacement battery online or at your local auto parts store, since these batteries aren't exclusive to key fobs.

Depending on the kind of key fob, there are different ways to open it and gain access to the inside. A quick search on the internet will identify the type of key fob you have and what kind of battery it requires. You can then purchase a new replacement and pop the old one out, and then put the new one into.


When repairing a broken key fob, the main concern is not to destroy the circuit or buttons further. If you try to pry off the key fob with a screwdriver or other hard edge, it could crack the plastic or damage the case. A replacement case is inexpensive and you can find the entire fob including the electronics on eBay or Amazon for under $40.

So, if your key fob doesn't work Check to see if the batteries are dead or whether the circuit board is damaged. If this is not the situation, you can get it repaired quickly and easily by a professional. If not, it might be time to replace the fob. Be sure to check the warranty on any replacement or used fobs that you purchase on the internet.