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How to Fix a Key Fob That isn't Working If your key fob doesn't work, a few easy steps can be taken to fix it. First, make sure that it's not the backup remote. If your backup remote cannot unlock and lock the doors of your car, it is likely that the primary remote isn't functioning. Most problems with car remote keys result from battery or circuitry problems. Battery The battery inside the key fob may get worn out over the course of time. It is simple to replace batteries. However it is essential that you use the correct kind. You can check your owner's guide or contact the manufacturer to find out the right kind. broken car key repair is also important to inspect the battery compartment, as dead batteries can leak caustic chemicals that can harm the remote. If replacing the battery does not solve the issue there could be other issues requiring professional attention. For example, if buttons appear stuck or damaged It may be necessary to take the remote apart and rework its parts. You could also try reprogramming the vehicle to recognize the new device. Buttons Key fobs can become dirty and worn-out from frequent use. It is not uncommon for buttons to stop functioning, or require a long press to make them work. This can be very frustrating, especially when you are away from your home and you need to turn on your car. Even malfunctioning or worn-out buttons are often fixable with a little effort and tools you already have at home. First, check that the batteries are properly placed and that the indentation on the back of the button has been filled. Then, carefully remove the remote and examine the circuit board. Examine for indications of rust or other signs the buttons have been damaged or worn. For example the paint that conducts electricity could be missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that is worn out or has conductive paint missing. Avoid rubbing too hard as this can erode the conductive paint and stop the button firing when it is pressed. Also, be sure to check the battery connector's terminals for any loose solder connections. If this is the case, soldering them back in place may restore functionality to the button. You can apply the same process to restore functionality to any other loose connection inside the fob. If any of the rubber buttons located at the front of the keyfob are not working or require being pressing extremely hard the graphite disks on the back of the button might have worn out and will require replacement. You can do this by rubbing a pencil over the disks. This will bring the button back to life. If none of this is helpful or if the button still does not respond to a hard press, then it may be because the circuit board has become damaged. It is possible to fix this issue by cleaning and re-soldering your fob, but you should have another spare in case it does not work. Circuitry Whether or not the keys fob buttons are functioning the circuit board that is inside your remote might be dirty. This issue can be fixed by a thorough inspection. Water and broken cases are the most frequent causes of dirty boards. A damaged case could let water and other debris to get into the circuit board, which can cause it to short. Water can also destroy pins and small connectors on the board called via's. If you're able to remove your key fob and don't mind a little mess, we can de-solder the buttons and solder new ones in their place. Also, you should check the connections between the battery terminals. They can get very dirty and if they're loose the buttons may not work or may even remain in their down position. Soldering the terminals and button's back into place is typically all that's required to return keys that are not in working condition. Non-Remote Transponder Chips The non-remote chips that are sealed are more durable than remote fobs, however they are susceptible to breaking when a hole is made in them, or when a door handle for a car or lawnmower runs over them. Fuse failures are usually the cause of non-remote chip failures. If you're not confident opening the key fob, you may take the circuit board off and use a multimeter to check that the diode is working properly. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob transmits an RF signal. Programming Key fobs are not indestructible and can be damaged by a lot of things. They can lose their pairing to the car's receiver due to shock or a low battery, which requires the reprogramming. A professional auto locksmith, or main dealer can reprogram your keyfob and get it functioning again. If, in the unlikely event that resetting or repairing your key fob doesn't work, it could be time to replace it all over again.