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How to Fix a Key Fob That isn't WorkingIf your key fob does not work and you're not sure why, you can fix it with just a few steps. First, check to make sure it's not the backup remote.If the backup is able to lock and unlock your car door, then there's a likely issue with the primary remote. The majority of car remote key malfunctions are caused by battery or circuitry problems.BatteryThe battery in a key fob can wear out over time. It is quite simple to replace batteries, but it is crucial to make sure that you choose the correct type that you can refer to the owner's manual or talk to the dealer for the manufacturer to find out what kind of battery you require. It is also crucial to check the battery compartment, since 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. If the buttons are stuck or broken for instance, it may be necessary disassemble the remote and rework each component. You could also try reprogramming your vehicle to recognize the new key fob.ButtonsFrom repeated use, key fobs can wear out and become dirty. It is not uncommon to have buttons stop functioning, or require a long push to make them work. 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 materials you may already have around the house.First, make sure that the batteries are correctly inserted and that the indentation at the back of the button is filled. Then, carefully open the remote and inspect the circuit board. Examine for signs of rust or other signs that the buttons are worn out or damaged, like missing the conductive paint. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that has become worn out or where conductive paint is missing. Do not rub too vigorously, as this could erode the conductive paint and prevent the button from firing when pressed.Examine the battery connector's terminals for loose solder connections. If this is the case, connecting them back may bring back function to the button. You can apply the same method to restore functionality to any other loose connection inside the fob.In the end, if any of the buttons made of rubber that are on the front of the key fob have stopped functioning or require a difficult press to function it is likely the graphite disks at the back of the button are wearing down and require replacement. You can do this by rubbing a pen over the disks. This should bring the button back to life.If all of this doesn't help or if the button still does not respond to a firm press, then it may be because the circuit board itself is damaged. This can be fixed by a quick clean, and replacing the solder, but it is ideal to have a spare fob available in the event this method does not work for you.CircuitryThe circuit board of your remote control may be dirty, regardless of whether the buttons on the key fob function or not. The issue can be solved by a thorough inspection. Water and broken cases are the most common causes of dirty boards. A damaged case allows water and other debris to get in and short out the electronics. Water can also eat through pins and vias, which are tiny connectors on the board.If you're able to open 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. Also, you should check the connections between the battery terminals. They can become very dirty and if they're loose the buttons might not work or even stick in their down position. Soldering the terminals and button's back into place is typically all that's needed to return a non-working key fob to working condition.Non-Remote transponder chipsThe non-remote chips sealed in a sealed case are more durable than remote fobs. However, they are susceptible to cracking in the event of a hole being drilled in them, or when a door handle for a car or lawnmowers plows over them. Failures of the fuse are typically the cause of non-remote chip failures.If key repair 're not comfortable opening the key fob, you can remove the circuitboard and utilize a multimeter to check that the diode is functioning correctly. If you're not comfortable doing this, go to your local hardware store or Oreilly's, and they'll usually have a RFID frequency tester that can let you know if the key fob is transmitting a signal.ProgrammingKey fobs are not indestructible and are susceptible to being damaged by a lot of things. They can break their connection with the receiver in your vehicle because of shocks or a low battery, requiring the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob to get it functioning again. If resetting or fixing your keyfob does not work, you may need to replace it.