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How to Fix a Key Fob That isn't Working If your key fob won't work and you're not sure why, you can fix it with some simple steps. First, ensure that it's not the backup remote. If your backup remote cannot unlock and lock the doors of your car, then it is likely that the main remote isn't working. The most common causes for key malfunctions for car remotes are issues with the circuitry or battery. Battery The battery inside the key fob may get worn out over the course of time. It is relatively easy to change out batteries, but it is crucial to ensure you choose the correct type that you can refer to your owner's manual, or contact the manufacturer's dealer to find out the kind of battery you require. It is also crucial to inspect the battery compartment, as batteries that are not working properly can release caustic chemicals that can harm the remote. If changing the batteries does not solve the problem it could be because there are other issues that require attention from a professional. If buttons are stuck or broken, for example it might be necessary to remove the remote and rebuild each component. You could also try reprogramming your car to recognize the new key fob. Buttons From repeated use, key fobs could wear out and become dirty. This is not uncommon, but it can cause buttons to stop functioning or require a hard press for them to function. This can be extremely frustrating particularly if you're away from home and need to start your vehicle. Fortunately, even worn out or broken buttons can usually be fixed with just a bit of time and a few materials you might already have in the home. First, check that the batteries are correctly inserted and that the indentation at the back of the button is filled. Open the remote carefully and look over the circuit board. Examine for evidence of rust, or other signs the buttons are damaged or worn. For example the paint that conducts electricity could be missing. Then, using key car repair -tip that has been dipped in rubbing alcohol, gently clean any membrane contacts that are worn or where conductive paint is missing. Avoid rubbing too hard since this could cause damage to the conductive painting and prevent the button firing when it is pressed. Examine the battery connector's terminals for loose solder connections. If this is the case, simply reconnecting them can restore functionality to the button. You can use the same method to restore functionality to any other loose connection in the fob. If any of the rubber buttons on the front of the keyfob isn't functioning or require to be press extremely hard the graphite disks on the back of the button could have worn out and will need to replaced. This can usually be done by rubbing a pencil on the disks, which should bring the button back to working. If none of these solutions work, or if you still are unable to get the button to respond when you press it hard, it could be that the circuitry has failed. This can sometimes be repaired with a quick clean and re-soldering, but it is best to have an extra fob on hand in the event that this method fails for you. Circuitry If the key fob buttons function, the circuit board inside your remote may be dirty. A thorough inspection is often enough to resolve this problem. Water and broken cases are the most common causes of dirty boards. A broken case can allow water and other debris into the circuit board, which can cause it to short. Water can also damage pins and vias, which are the tiny connectors that are found on the board. If you're able to open your key fob and don't mind some mess, we can take off the buttons and solder new ones in their place. Also, it's worth checking the connections between the battery terminals. If they're loose, the buttons may not function or get stuck in their down position. Soldering the terminals and buttons back in their place is generally all that's required to return the key fob that is not working to working order. Non-Remote transponder chips Sealed non-remote transponder chips are much more durable than remote fobs they are contained in, but they can still be damaged by a hole that is made in them or pushed over by a lawnmowers blade or door handle for a car. Most of the time non-remote transponder chip malfunctions could be attributed to blowing fuses. If you're able to open a key fob that is sealed and are able to bear the mess, you can easily remove the circuit board and test the fuse with a multimeter to ensure that it is functioning as intended. function. If you're not comfortable doing this, visit your local hardware store or the Oreilly's and they usually have an RFID frequency tester that can tell you if the key fob is sending signals. Programming Key fobs endure a lot of abuse and aren't completely indestructible. They may lose their connection with the receiver in your vehicle due to shocks or low battery, requiring changing the program. A professional auto locksmith or dealer can reprogram your key fob and get it functioning again. If resetting or fixing your keyfob does not work, you may need to replace it.