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How to Fix a Key Fob That isn't Working If your key fob won't work, you can fix it by following some simple steps. The first step is to make sure it's not the backup remote. If the backup remote is able to lock and unlock your car doors, then there is likely an issue with the primary remote. Most problems with car remote keys are caused by circuitry or battery issues. Battery The battery inside a key fob can get worn out over the course of time. It is easy to replace the battery. However, it is important that you choose the right kind. You can consult your owner's guide or contact the manufacturer to find out the correct type. key repair car is recommended to examine the battery compartment with care since dead batteries may release caustic chemicals that could harm the remote. If replacing the battery does not solve the issue, there may be other issues that require attention from a professional. If the buttons are stuck or broken for instance it might be necessary to take the remote apart and rework each component. You could also try reprogramming your car to recognize the new key fob. Buttons Key fobs may become filthy and worn out due to frequent use. This is not unusual, but it can cause buttons to cease working or require a hard press for them to function. This can be frustrating, especially when you are away from home and need to switch on your car. Even worn-out or malfunctioning buttons are often fixable with a bit of time and the tools you already have at home. First, check that the batteries are properly charged and that the indentation on the back of the button is filled. Then, open the remote with care and examine the circuit board. Look for indications of rust or other indications that the buttons have been worn or damaged. For example the paint that conducts electricity could be missing. Utilizing a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or where conductive paint is missing. Be careful not to rub too hard, since this could cause damage to the conductive painting and prevent the button from firing when it is pressed. Check the battery connector's terminals carefully for any loose solder connections. Soldering them back into place can restore the button's functionality in the event that this is the situation. You can follow the same process to restore functionality to any other loose connection within the fob. If any of the rubber buttons on the front of the keyfob isn't functioning or require to be pressed extremely hard the graphite disks at the back of the button may have worn out and will require replacement. This can be done by rubbing a pencil across the disks, which will bring the button back to life. If all of this doesn't help or if the button doesn't respond to a firm press, then it may be the case that the circuit board itself has gone bad. This can be fixed by a quick clean and re-soldering, but it is ideal to have a spare fob in case this method does not work for you. Circuitry Whether or not the key fob buttons are working, the circuit board inside the remote could be dirty. The issue can be solved by a thorough inspection. Water and broken cases are the most frequent causes of dirty boards. A damaged case allows water and other debris to pass through and short out the electronics. Water can also get through pins and vias, which are tiny connectors on the board. If you are handy enough to open your key fob and don't mind making a mess, we can take the buttons out of their sockets and solder in new ones. It's also worth looking at the battery terminal connections. If they are loose, the buttons might not function properly or become stuck in their down position. Soldering terminals and buttons back to their proper positions is usually enough to restore a non-working fob to working. Non-Remote transponder chips The sealed non-remote chips are more durable than remote fobs, but they are susceptible to breaking when a hole is made into them or in the event that a door handle of a car or lawnmower runs over them. Fuse failures are usually to blame for non-remote chips failures. 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 examine the fuse using a multimeter for proper diode function. If you're unsure about doing this, visit your local hardware store or Oreilly's, and they will usually have a RFID frequency tester that can let you know whether the key fob is sending signals. 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 because of shock or a low battery, which calls for the reprogramming. A professional auto locksmith or a dealer in the main, can reprogram your keyfob to get it functioning again. If resetting or repairing your keyfob does not work, you may need to replace it.