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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 by following a few simple steps. First, ensure that it's not the backup remote. If your backup remote can lock and unlock the doors of your car, it is likely that the main remote isn't working. The most frequent causes of key malfunctions for car remotes are battery or circuitry issues. Battery The battery in a key fob can be worn out over time. It is relatively easy to change out the battery, however it is important to ensure that you choose the correct type that you can refer to your owner's manual, or contact the dealer for the manufacturer to find out the kind of battery you need. It is also essential to examine the battery compartment, since batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the battery doesn't fix the problem, there may be other issues requiring professional attention. For instance, if buttons appear stuck or damaged It may be necessary to disassemble the remote and rework its components. It is also possible to reprogramme the vehicle to recognize the new device. Buttons Due to repeated use, key fobs may get dirty and worn. It is not common for buttons to stop working, or to require a hefty press to make them work. This can be a huge hassle especially if you're away from home and need to start your vehicle. Even malfunctioning or worn-out buttons can be fixed with a bit of time and tools you already have at home. First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. Then, carefully remove the remote and look at the circuit board. Examine for signs of rust or other indications that the buttons have been damaged or worn. For example there could be conductive paint missing. Then, using a Q-tip that has been dipped in alcohol to gently clean any membrane contacts that have become damaged or have conductive paint missing. Don't rub too hard as this can damage the conductive paint and stop the button from firing when pressed. Check the battery connector terminals for loose solder connections. Soldering them back to their original position will allow the button to function again if this is the case. The same process can be used to restore functionality to any other loose connections in the fob. If any of the rubber buttons on the front of the keyfob aren't working or need to be pressed very hard the graphite disks at the back of the button may have worn out and will require replacement. key car repair can be done by rubbing a pencil over the disks, which will bring the button back to life. If none of this is useful or if the button still does not respond to a hard push, then it may be because the circuit board itself is damaged. It is possible to fix this by cleaning and re-soldering your fob however, you should have another spare in case it doesn't work. Circuitry If the key fob buttons function the circuit board that is inside your remote might be dirty. A very thorough inspection is often enough to resolve this issue. Broken and damaged cases are the most common causes of boards that are dirty. A damaged case can allow water and other debris to pass through and short circuit the electronics. Water can also get through pins and vias, which are the tiny connectors on the board. If key fob repairs enough to remove your key fob and aren't afraid of a little mess, we can take off the buttons and then solder new ones in their place. It's also worth checking 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 to their proper positions is usually enough to restore a non-working fob back to working. Non-Remote transponder chips The sealed non-remote chips are more durable than remote fobs, but they are susceptible to cracking if a hole is drilled in them, or when a door handle for a car or lawnmowers is pushed over them. The failure of the fuse is 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 determine if the diode is working correctly. If you're unsure about doing this, head to your local hardware store or the Oreilly's and they usually have an RF frequency tester that will determine if the key fob is sending a signal. Programming Key fobs are subject to lots of abuse and aren't indestructible. They can lose their pairing to the car's receiver due to shock or low battery, which requires them to be reprogrammed. A professional auto locksmith or a main dealer can reprogram your key fob and get it back up and running. If resetting or fixing your key fob fails, you may need to replace it.