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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 a few simple steps. First, check to make sure it's not your backup remote. If the backup remote is able to lock and unlock your car doors, then there's a likely issue with the primary remote. Most car remote key failures are caused by circuitry or battery issues. Battery The battery inside a key fob can wear out over time. It is simple to replace the battery. However it is essential that you use the correct type. You can refer to your owner's manual or call the manufacturer to determine the correct type. It is also important to inspect the battery compartment, since batteries that are not working properly can release caustic chemicals that can harm the remote. If replacing the batteries doesn't solve the issue it could be that there are other issues that require attention from a professional. If the buttons are broken or stuck for instance, it may be necessary disassemble the remote and rework each component. You can also try reprogramming the vehicle to recognize the new key fob. Buttons Key fobs can become dirty and worn out from repeated use. This is not atypical however, it can cause buttons to cease working or require a very hard press for them to function. This can be very frustrating especially when you're away from home and have to start your car. Even malfunctioning or worn-out buttons are often fixable with a little time and the 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. Open the remote carefully and look over the circuit board. Look for evidence of rust, or other indications that the buttons have been worn or damaged. For example, conductive paint may be missing. Utilizing a Q-tip dipped in alcohol to gently clean any membrane contacts that have become damaged or where conductive paint is missing. Don't rub too hard as this can damage the conductive paint, and block the button from firing when it is pressed. Check the battery connector terminals carefully for any loose solder connections. If this is the case, simply connecting them back can restore function to the button. You can use the same method to restore functionality to any other loose connection within the fob. If any of the rubber buttons on the front of the keyfob aren't working or require being press extremely hard the graphite disks at the back of the button might have worn out and will require replacement. You can do this by rubbing a pen over the disks. This should bring the button to life. If none of these solutions work, or if you still not be able to get the button respond when pressed hard, it could be that the circuitry is failing. This can sometimes be repaired by a quick clean, and refitting, but it's recommended to have an additional fob on hand in the event that this method does not work for you. Circuitry Whether or not the key fob buttons function the circuit board in the remote could be dirty. A thorough examination is often enough to resolve this problem. The most common causes for dirty circuit boards are water and broken cases. A broken case allows water and other debris to get in and short out the electronic components. Water can also get through pins and vias, which are tiny connectors that are found on the board. If you're handy enough to open your key fob, and you're not afraid of a little mess, we can take off the buttons and solder new ones in their place. It's also worth examining the battery terminal connections. If they're loose, the buttons might not function or get stuck in their down position. Soldering car key repair cost and buttons to their original positions is often enough to restore a non-working fob to working. Non-Remote transponder chips The non-remote chips that are sealed are more durable than their remote fobs, however they are susceptible to breaking when a hole is made into them or when a door handle for a car or lawnmowers plows over them. Most of the time non-remote transponder chips fail, and this could be attributed to an exploded fuse. If you're able to remove a key fob that is sealed and are willing to put up with the mess, you can easily remove the circuit board and check the fuse using a multimeter for proper diode function. If you don't feel comfortable with this, visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits a signal. Programming Key fobs aren't indestructible and can be damaged by a variety of factors. They can break their connection with the receiver inside your vehicle because of shocks or a low battery, which calls for reprogramming. A professional auto locksmith or dealer can reprogram your key fob to get it working again. In the event that resetting and fixing your key fob isn't working it may be time to replace it completely.