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How to Fix a Key Fob That isn't Working

If your key fob isn't functioning There are a few simple steps that can fix it. The first step is to make sure that it's not your backup remote.

If your backup remote can lock and unlock the doors of your vehicle, it is likely that the primary remote is not working. The most frequent causes of key malfunctions for Emergency car key repair remotes are issues with the circuitry or battery.

Battery

It is not uncommon to find a battery on the key fob for cars to get worn out. It is fairly easy to replace batteries, but it is crucial to ensure you use the right type that you can refer to your owner's manual, or contact 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 toxic chemicals that could damage the remote. If replacing the battery does not fix the problem there could be other issues requiring professional attention. For instance, if the buttons seem to be stuck or damaged it could be necessary to take the remote apart and rebuild its components. You can also try reprogramming your vehicle to recognize the new key fob.

Buttons

Due to repeated use, key fobs may wear out and become dirty. This is not uncommon however it can cause buttons to stop functioning or require a difficult press to get them to work. This can be frustrating especially when you're away from your home and you need to turn on your car. Even broken or damaged buttons can be fixed with a bit of time and tools you already have at home.

First, check that the batteries are up correctly and that the indentation on the back of the button is filled. Open the remote carefully and examine the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, like missing conductive paint. Then, using a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint, and block the button from firing when you press it.

Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back to their original position will restore the button's functionality if this is the situation. You can use the same method to restore functionality to any other loose connection inside the fob.

Finally, if any of the buttons made of rubber on the front of the key fob stop working or require a very long press to function it is likely that the graphite disks on the back of the button are deteriorating and require replacement. You can do this by rubbing a pen across the disks. This will bring the button back to life.

If all of this doesn't help, or if the button does not respond to a hard press, then it may be the case that the circuit board is damaged. This can be fixed by a quick clean and replacing the solder, but it is recommended to have an additional fob in case this method fails for you.

Circuitry

Whether or not the key fob buttons are working the circuit board in the remote could be dirty. A thorough examination is usually enough to fix this issue. The most common causes of dirty circuit boards are water and damaged cases. A broken case allows water and other debris to enter and short circuit the electronics. Water can also eat away at pins and small connectors on the board, referred to as via's.

If you're handy enough to open up your key fob and aren't afraid of a little mess, we can de-solder the buttons and solder new ones in their place. It's also worth examining the battery terminal connections. They can become extremely dirty and if they're loose, the buttons might not work or even stick in their down position. Soldering the terminals back into place is usually enough to restore a non-working fob to working.

Non-remote key repairs transponder chips

The non-remote chips that are sealed are more durable than their remote fobs, but they are susceptible to breaking in the event of a hole being drilled 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 can be attributed to an exploded fuse.

If you're not comfortable opening the key fob, remove the circuitboard and utilize a multimeter to determine if the diode is operating properly. If you're unsure about doing this, head to your local hardware store or Oreilly's and they usually have an RF frequency tester that will let you know if the key fob is sending a signal.

Programming

Key fobs endure a lot of abuse and aren't impervious to damage. They can lose their pairing with the receiver in your vehicle because of shocks or a low battery, requiring changing the program. A professional auto locksmith or a main dealer will be able to reprogram your key fob to get it working again. In the rarer case that resetting or repairing your key fob fails it could be the time to replace it completely.