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How to Fix a Key Fob That isn't Working If your key fob won't work then you can fix it with a few simple steps. The first step is to be sure it's not the backup remote. If the backup remote is able to lock and unlock your car doors it is most likely an issue with the primary remote. Most problems with car remote keys result from circuitry or battery issues. Battery The battery inside a key fob can wear out over time. It is quite simple to replace batteries, but it is essential to ensure that you choose the correct type and you can consult the owner's manual or talk to the manufacturer's dealer to find out the kind of battery you require. It is also a good idea to inspect the battery compartment with care because dead batteries can release caustic chemicals that could damage the remote. If changing the battery doesn't fix the issue there may be additional issues requiring professional attention. For instance, if the buttons seem stuck or damaged It may be necessary to take the remote apart and rework its components. You could also try reprogramming the vehicle to recognize the new key fob. Buttons From repeated use, key fobs may wear out and become dirty. This is not unusual however, it can cause buttons to cease functioning or require a difficult press to get them to function. This can be a hassle especially when you're away from home and you need to turn on your car. Fortunately, even worn out or broken buttons can usually be fixed with a bit of time and a few materials you have in the house. First, make sure that the batteries are correctly placed and that the indentation on the back of the button has been filled. Open the remote carefully and examine the circuit board. Look for indications of rust or other signs the buttons have been worn or damaged. For instance the paint that conducts electricity could be missing. Use a Q-tip dipped into alcohol to gently clean any membrane contact that has worn-out or where conductive painting is missing. Don't rub too hard in order to damage the conductive paint and stop the button from firing when you press it. Also, be sure to check the battery connector terminals for a loose solder connection. If this is the case, reconnecting them can restore functionality to the button. The same process can be used to restore functionality to any other loose connections in the fob. Finally, if any of the buttons made of rubber that are on the front of the key fob stop working or require a long press to function it is likely the graphite disks that are on the back of the button are deteriorating and require replacement. key fob repair service is usually done by rubbing a pencil over the disks. This should bring the button to life. If none of these solutions work, or if you still not be able to get the button respond when you press it hard, it is possible that the circuitry has failed. This can sometimes be repaired with a quick clean and replacing the solder, but it is best to have an extra fob on hand in the event that this method fails for you. Circuitry The circuit board of the remote control could be dirty, regardless of whether the buttons on the key fob are working or not. The issue can be solved by a thorough inspection. Broken cases and water are the most frequent causes of dirty boards. A damaged case can let water and other debris to get into the circuit board, causing it to short. Water can also destroy pins and connectors on the board called via's. If you're able to remove your key fob, and you're not afraid of some mess, we can de-solder the buttons and solder new ones in their place. It's also worth examining the battery terminal connections. If they're loose, the buttons might not work or even become stuck in their down position. Soldering terminals and buttons back into place is usually enough to bring a non-working fob to working. Non-Remote Transponder Chips Sealed non-remote transponder chips are much more durable than remote fobs they are contained in, however they are still susceptible to being broken by a hole being that is drilled into them or over by a lawnmowers or car door handle. The failure of the fuse is usually to blame for non-remote chip failures. If you're not comfortable opening the key fob, you may remove the circuitboard and utilize a multimeter to determine if the diode is operating correctly. If you don't feel comfortable with this, visit your local Oreilly or hardware store and test their RF frequency tester. This will let you know whether the key fob transmits an RF signal. Programming Key fobs endure lots of abuse and aren't completely indestructible. They may lose their connection to the receiver in your car due to shock or a low battery, requiring the reprogramming. A professional auto locksmith or a main dealer can reprogram your key fob and get it working again. In the event that resetting or repairing your key fob isn't working, it could be time to replace it completely.