Car Key Fob Repair: 11 Thing You're Forgetting To Do Car Key Fob Repairs

Today's key fobs can do more than unlock and start cars. This added complexity can result in costly repairs if it breaks.

The good news is that the majority of fobs are equipped with flat-watch-style batteries that are easy to replace at home. You may find that a simple reset can allow your fob to function again.

Battery Replacement

The most common reason that a key fob doesn't work is due to the battery being dead. This is easy to repair, and is worth a try before you spend money on a new fob. You can pick up an additional button cell battery at your local auto parts store or hardware retailer in the event that you already have one. You can also check the owner's manual (or, if you don't have one, YouTube is full of videos from people who show you how to do it) for specific instructions on opening and replacing the battery on the specific type of fob you have.

The majority of fobs have two halves that snap together -You'll need to pry the sides apart to access the battery. You'll typically need a small screwdriver or a different tool that has a flat, thin blade. You can insert your tool into a notch at the bottom of the key fob. You may also want to look for small pieces that may be loosened while working.

When you have your new battery, place it the same way that you removed the previous one. The positive (+) side should face the buttons and the negative (-) the marks on the battery compartment.

Test the fob to see whether it functions by pressing the button. If it isn't working, there may be a problem with your car that needs to be fixed or replaced by a professional.

Certain key fobs require special tools to open, and the contacts inside may be delicate and susceptible to corroding. In remote key fob repair is to speak with a specialist or a dealer. When replacing a battery be gentle and follow your owner's instructions. You might be able to find an identical battery at a big-box retailer or discounter, but be sure you read your owner's guide to ensure it's compatible with your vehicle.

Replacing the Internal Key

The majority of key fobs have the physical key mechanical that is hidden within the fob to stop thieves from getting. When the battery in the fob fails and the key is discarded, a blank one is left behind, which can be used to open trunks and doors. In some cases, this key can even start certain cars. Many people don't realize this however, they can save from a trip to the dealer by simply replacing the fob battery. The flat watch-style batteries are used in most modern fobs. These batteries are easily found in hardware and auto parts stores. The right kind of battery is important however. A bad battery can cause damage to the circuitry and lead to the fob's failure much sooner.

If the problem persists after replacing the battery, it may be a sign that something else is wrong in your vehicle. If you have an owner's manual, check to see if there is a reset option available to restore the fob's factory programming. If that doesn't help then you'll need to visit a dealership or an independent shop that specializes in vehicle security systems and fob programming.

Fobs could also fail due to malfunctioning transmitter receivers. They are usually found close to the steering wheel, or on the dashboard. They transmit signals to allow you to unlock your car and start it with the fob. If you're required to move closer and closer to your vehicle to get it to work, there's a high possibility that the transmitter is not working.

It may be required for a professional to remove the case of the fob to replace the transmitter. A simple screwdriver will usually get the job done however, some fobs have complex release mechanisms that require a specific tool or specialized equipment available only at a dealer. This task must be handled by a qualified mechanic to ensure that the fob is not damaged and yourself.

Reprogramming the Key

A key fob that is not functioning just requires a new battery. Because these batteries are cheap and readily available at pharmacies and home improvement stores, this is the ideal first step before investing in a new car key fob.

Alternatively, you may be able to reprogram the fob on your own by following a few basic steps. The procedure may differ for different vehicles, so it is recommended to refer to the owner's manual and study the specific model of your vehicle. One key fob could require that the ignition be on when changing the program. Another key might require the key to be removed and inserted repeatedly.

The procedure is easy. Make sure that the battery is securely in place. Close all doors, except the driver's door. This will ensure that the new key is communicating with the vehicle properly. Place the old key in the ignition, then turn it on but don't start the engine. Press the lock button while aiming the fob toward the receiver for transmission. This is usually located on the front, above the mirror. The key will signal to the vehicle within a short amount of time that it is being programmed. This can be done by turning off the door locks or by emitting an audible chime. This process can be tricky, so it's important to be attentive to the timing and don't over-press the key button.

If the key fob does not work after reprogramming, try replacing the batteries. If the issue persists, you might want to check with your local dealer or locksmith. A professional locksmith will have the tools and programming equipment needed to reprogram your car's fob or make a new key if it's required.


Genesky says that he can program newer fobs that range between $200 and $250, depending on the model of vehicle. He's experienced European models rejected because they don't have the equipment needed. Fortunately, many aftermarket fobs can be programmed however it's best to talk to an auto dealer first to see what their price is.

Finding a New Fob

If your key fob is simply beyond repair, you might need to purchase an entirely new one. Based on the make and model, an auto locksmith or a dealership may be able to help. The dealership is likely to be the most expensive alternative for replacing a fob However, they'll have the necessary tools and software to program your vehicle correctly. Numerous locksmiths who are independent offer a new car key fob at the lower cost.

It's a good idea to attempt to reset the fob you have before you decide to buy an entirely new one. Your owner's manual should outline the proper procedure for reset, which is usually just the pushing of a button which restores it to factory programming.

You should also check the owner's manual and warranty information to see whether you can obtain an alternative fob for your key. If your car's warranty is still active or you have an auto club or insurance policy that covers bumper to bumper, you may qualify for a reimbursement of the cost of replacing the fob.

The process of getting a fob can be simple enough, but finding the right place to have it done can be a challenge. You might want to visit the dealer for this service if have a newer vehicle and want peace of mind knowing that your key fobs work correctly. If you're looking for a more affordable alternative, it's possible to find a locksmith that will offer the same service for less cost.

A locksmith professional is a good option for those who aren't comfortable with this type of work. They are trained and equipped to change or reprogram car key fobs of all types and do it quickly. A locksmith can also come to your office or home which is convenient for a lot of people. They can even cut and program keys on-site in case you've lost keys, which is great for those who prefer not to leave their cars in the dark.