Car Key Fob Repairs
Key fobs of today are more than just a way to unlock and start vehicles. This added complexity can result in costly repairs when it fails.
The good news is that the majority of fobs have flat-watch-style batteries that are simple to replace at home. You might find that a simple reset is enough to make your fob work again.
Battery Replacement
A dead battery is the main cause of a key fob not working. It's a simple fix and worth trying before you spend money on a replacement fob. You can purchase a new button cell battery at your local auto parts retailer or hardware store if you have one. You can also refer to your owner's manual (or in the case that 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 your particular type of fob.
You'll have to gently pull off the sides of many fobs to reach the battery. You'll typically need a small screwdriver or a different tool that has a flat, thin blade. You can put your tool into a notch on the bottom of the key fob. You may also want to be on the lookout for small pieces that could come loose while you work.
Once you have your new battery, insert it the same way that you removed the old one. The positive (+) side should face the buttons and the negative (-) the marks on the battery compartment.
Check key fob repairs to determine whether it is working by pressing a button. If it isn't working, there may be a problem with your car that needs to be repaired or replaced by a professional.
Certain key fobs require specific tools to open, and the contacts inside can be fragile and easily corroded. In these instances the best choice is to speak with a specialist or dealer. When replacing a battery be gentle and follow the owner's manual. You might be able to find a similar battery at a discounter or big-box retailer but you'll have to consult your owner's manual to be sure that it's the right one for your vehicle.
Replacing the Internal Key
Most key fobs include a physical mechanical key however, it's hidden within the fob to prevent thieves. When the fob battery dies, it leaves behind a blank internal key that can unlock trunks and doors (and in some cases, start certain cars). Most people don't know this, but they can avoid having to go to the dealership by simply replacing the fob's battery. Most modern fobs use flat-watch-style batteries which can be found in hardware stores and auto parts shops. The right kind of battery is crucial, however. A wrong battery can harm the circuitry, causing the fob's failure much sooner.
If the issue persists after you replace the battery, it may be a sign that there is something else wrong in your vehicle. If you have an owner's manual and you're not sure, try to determine if there is a reset option available to restore the fob's original programming. If this fails, you'll need visit a dealership or a shop independent that specializes in vehicle-security systems and key fob programming.
Fobs can also fail because of faulty transmitter receivers. They are typically placed on the dashboard or next to the steering wheel, and they transmit signals that allow you to unlock and start your car with the fob. If you're having to get closer and closer to your vehicle to get it to work, there's a high chance that the transmitter isn't working.
A professional may need to open the case to replace the transmitter. A simple screwdriver can usually get the job done, but some fobs have complicated release mechanisms that require a special tool or equipment that is available only at a dealership. This is a job that should be done by a certified mechanic to ensure that the fob is not damaged and yourself.
Reprogramming the Key
Often a non-functional key fob just requires a new battery. Because these batteries are cheap and readily available in pharmacies and home improvement stores, it's the ideal first step before buying an entirely new car key fob.
Alternately, you might be able to reprogram the fob by following some basic steps. The procedure may differ for different automobiles, so refer to the owner's manual and study the specific model of your vehicle. For example the key fob might require that the ignition be switched on while reprogramming the key. One key fob may require the key to be inserted multiple times.
The basic procedure is simple. First, ensure that the new battery is firmly in place. Then, sit in the driver's seat and close all doors EXCEPT for the driver's side door. This will ensure that the new key fob can communicate with the vehicle in a proper manner. Insert the old key into the ignition, then turn it ON but do not start the engine. Then, press the lock button on the fob, while looking at the transmission receiver, which is typically located on the front of the car above the mirror. The key will signal to the vehicle within a brief amount of time that it's being programmed. This can be accomplished by turning the door locks or by emitting an audible chime. This is a challenging process, so pay close attention to timing and don't over-press the button.
If the key fob doesn't work, try reprogramming it again using new batteries. If the issue is still there, you might want to check with your local locksmith or dealer. A professional locksmith will have the tools and equipment needed to reprogram your car fob or create a new one if necessary.
Genesky says he can usually program newer fobs for $200-$250, based on the car. However, he's had the need to refuse customers with European models because they don't have the costly equipment they require. A majority of the aftermarket fobs are programmed, but you should always check with your local car dealer to determine the cost.
Finding a New Fob
If your key fob cannot be repaired, you might have to purchase a new one. Based on the make and model, a dealership or an auto locksmith may be able to help. The dealership is likely to be the most expensive option for a replacement fob, but it also has the tools and software required to program your car correctly. Many independent locksmiths offer a brand new car key fob for a much lower price.
It's a good idea to attempt to reset your current device before you make the decision to purchase a new one. The owner's guide should explain the correct procedure for reset. It is typically the result of a series of button presses which restores the factory settings.
You should also look over the owner's guide and warranty information to determine if you can get an additional fob for your key. If your car is under warranty, or you have a car-insurance policy or auto club membership that includes bumper-to-bumper coverage, you may be eligible for reimbursement for the cost of a new fob.
Finding a fob is simple enough, but finding the right place to have it done isn't easy. If you have a relatively new vehicle and you want the security from knowing that your key fobs are in working condition, you may be better off going to the dealership for this service. If you're looking for a more affordable alternative, it's possible to find a locksmith that can provide the same service for an affordable cost.
If you aren't comfortable handling this type of work on your own, a professional locksmith may be a good option. They are equipped and trained to change or reprogram key fobs for cars of all kinds and do it quickly. A locksmith can also come to your office or home which is a great option for many people. They can also cut and program keys on the spot in case you've lost them. This is ideal for those who don't like to leave their car unattended.