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How to Repair Car Key Fobs

Even though we use them numerous times, key fobs are not indestructible. In fact, they can break down in many different ways.

Other issues could be more important than a dead battery. The majority of problems can be fixed by a quick fix at home.

Dead Battery

A dead battery is the main reason for a key fob not working. Fob batteries can deplete quickly, especially if they are exposed to extreme heat or cold temperatures, humidity or even water. It's a good idea to keep an extra fob battery in your wallet just in case.

You will usually know when the battery of your car key fob is running low because the LED light will stop glowing. It's also possible that your key fob won't function at the same distance it did in the past. In this scenario the key fob could need to be programmed again or replaced completely.

Fortunately the replacement of a car key fob battery is easy. Find out the type of battery that is used. The type of battery you are using should be stamped on the back of your key fob. If you're not sure it is, doing a quick Google search will help. Open the key fob along the seam after you have identified the type of battery. You'll need an small screwdriver with a flat head or even your fingernail pry the two halves apart. Remove the old battery, and replace it with a brand new one. Then, insert the new battery so that the positive (+) face is facing the buttons on the fob.

Some drivers aren't aware that their fob has died until they lock or unlock their vehicle and the buttons stop working. This can be fixed by reprogramming your fob. However, it can be time-consuming and expensive. You can also call roadside assistance to determine if they are able to jumpstart your vehicle and get it back on the road.

If you have tried all three of these methods and your car still won't start then it's time for an expert. A trained technician can tell the computer in your car needs changing its programming, or if the fob simply needs replacement batteries. They will also suggest a reputable auto repair shop to replace your key fob. In the end, though sometimes, a brand new fob is the most effective solution.

Circuit Board Damage

A key fob is able to withstand many physical abuses and is not indestructible. The circuit board, battery and buttons are all susceptible to wear and tear. It is essential to take care of these parts to keep your key fob in good condition.

The easiest way to test is to make sure the battery in your key fob isn't dead. If it is, replace the battery and check if it fixes your issue. If this doesn't work, you might need to open the fob and clean the contact surfaces. It is sometimes difficult to open certain key fobs since they don't have an easy-release mechanism. You may harm your fob by trying to break it. You can purchase a specific tool to open your key fob, but you must always follow the instructions of the manufacturer to avoid damaging it.

A damaged or damaged key fob circuit board is a common problem. This can be caused by many things, such as moisture or dirt that gets into the battery compartment, software issues, or even an accidental firmware update. If your key fob isn't working completely, consider having it reprogrammed by an expert locksmith who specializes in this kind of work.

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

It is also possible to replace a switch or an electrical component inside your key fob. There are online guides that help you fix this yourself. Be cautious, however, as the circuit board that is inside your key fob is small and can easily break if handled roughly. If you do this yourself, be certain to use a top quality SMT switch and solder it into place properly.

Buttons that are worn out

Car key fobs can suffer quite a bit of wear and tear. They're prone to being dropped, and they often spend a lot of time moving around in your purse or pocket. Sometimes, this can cause the buttons to wear out or snagged. A simple adjustment can solve the issue.

Modern key fobs are equipped with sensors that can detect when they have been press. This is due to the fact that they decrease the possibility of someone taking your vehicle. If the buttons on your key fob don't respond when you press them, they're worn out and should be replaced.

Key fobs also have an electronic circuit inside that sends signals to the car. Those signals include commands to unlock and lock, as well as instructions to start your engine. If the circuit board inside is damaged, then your key fob may not allow you to unlock or start your engine. This type of damage is typically caused by water or blunt force.

If you're having to press the buttons more than normal to activate them, then your fob's buttons are becoming worn out. Additionally the fob might stop sending a signal to the car or have a lower range than it did before.

Contact a locksmith right away when you're unable to use your key fob to start your vehicle. They'll be able to tell whether the key fob itself is damaged or the ignition cylinder has worn down.

Fortunately, the majority of car key fob issues aren't too serious or complex. Keep a spare key fob in your car always in case you end up being shocked by a malfunctioning device. You'll never be caught in the middle due to a malfunctioning or lost key. Of key car repair , if you do happen to lose your car key spare, a locksmith can help change the key to ensure it is compatible with your car's ignition. They'll also be able fix any internal damage that's occurred on the key fob.

Broken Case

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

If the board is damaged or dead the key fob won't be able to function. A dead key fob might require reprogramming by your local auto locksmith, or dealership.

Another reason why your key fob may not be working is because the batteries are dead. This is a quick solution that can be done at home by replacing the battery. The good thing is that you can find an alternative battery on the internet or at a local auto parts store, since these batteries are not exclusive to key fobs.

Depending on the type of key fob, there are a variety of ways to open it up and access the insides. A quick search online should identify the type of key fob yours is and the type of battery it takes. From there, you can purchase a replacement and easily pop the old one out and the new one in.

If you are repairing a damaged key fob, the main concern is not to destroy the circuit or buttons in any way. If you attempt to remove a key fob with a sharp edge, such as a screwdriver can damage the case or even damage the plastic. Fortunately, a replacement case is inexpensive and you can buy the entire fob and the electronic components from eBay or Amazon for less than $40.


So, if your key fob doesn't work Check to see if the batteries are depleted or if the circuit board has been damaged. If this is not the case, you can have it repaired quickly and easily by a professional. In the event that it isn't, it's time to consider a replacement. Make sure you check the warranty of any replacement or used fobs purchased online.

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