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How to Fix a Key Fob That isn't Working If your key fob isn't functioning, a few easy steps can be taken to fix it. First, ensure that it's not the backup remote. If your backup remote is unable to unlock and lock the doors of your car, then it is likely that the main remote isn't functioning. The most common causes of car remote key failure are battery or circuitry issues. Battery It is not unusual for the battery in a car key fob to get worn out. It is simple to replace a battery. However it is crucial to select the right type. You can check the owner's manual or contact the manufacturer to determine the right kind. It is also important to inspect the battery compartment, as batteries that are not working properly can release caustic chemicals which can damage the remote. If changing nearby key repair shop does not solve the issue it could be that there are other issues that require professional attention. For instance, if the buttons seem to be stuck or broken it could be necessary to disassemble the remote and rework its components. You can also try reprogramming your car to recognize the new key fob. Buttons From repeated use, key fobs can become worn and dirty. This is not uncommon however it can cause buttons to stop working or require a very difficult press to get them to function. This can be very frustrating particularly if you're away from home and you need to start your vehicle. Fortunately, even worn out or broken buttons can usually be fixed with a bit of time and a few items you may already have around the house. First, check that the batteries are properly inserted and that the indentation on the back of the button has been filled. Then, carefully open the remote and look at the circuit board. Look for signs of corrosion or other indications that buttons are worn out or damaged, like missing conductive paint. Use a Q-tip, dipped in alcohol to gently clean any membrane contact that has damaged or where conductive painting is missing. Do not rub too vigorously in order to damage the conductive paint and stop the button from firing when pressed. Also, carefully check the battery connector terminals for a loose solder connection. If this is the case, soldering them back in place could restore functionality to the button. You can use the same process to restore functionality to any other loose connection in the fob. If any of the rubber buttons located at the front of the keyfob isn't working or require being press extremely hard the graphite disks on the back of the button could have worn out and will require replacement. This can be done by rubbing a pencil on the disks, which should bring the button back 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 could be that the circuitry has failed. It is possible to fix the issue by cleaning and re-soldering the fob but you should also have another spare in case it doesn't work. Circuitry If the key fob buttons are working the circuit board that is inside your remote may be dirty. This problem can be resolved through a thorough examination. Broken and damaged cases are the most frequent causes of boards that are dirty. A broken case allows water and other debris to pass through and short circuit the electronics. Water can also destroy pins and connectors on the board, which are known as via's. If you're skilled enough to open your key fob and you don't mind making an mess, you can take the buttons out of their sockets and then solder new ones. Also, it's worth checking the connections between the battery terminals. If they're loose, the buttons may not work or even become stuck in their down position. Soldering the terminals back to their original positions is often enough to bring a non-working fob to a working condition. Non-Remote transponder chips Sealed non-remote transponder chips are 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 majority of non-remote transponder chip failures can be attributed to blowing fuses. If you're handy enough to remove a sealed non-remote key fob and can tolerate the mess, you can take off the circuit board and test the fuse with a multimeter to ensure that it is functioning as intended. function. If you're not confident doing this, visit your local hardware store or Oreilly's, and they usually have a RFID frequency tester that can determine whether the key fob sending signals. Programming Key fobs aren't impervious to destruction and are susceptible to being damaged through a variety of causes. They may lose their connection with the receiver inside your vehicle because of shocks or a low-battery, which requires the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob and get it back up and running. If resetting or replacing your keyfob does not work it is possible to replace it.