How to Fix a Key Fob That isn't Working

If your key fob won't work and you're not sure why, you can fix it with some simple steps. The first step is to be sure that it's not the backup remote.

If your backup remote cannot lock and unlock the doors of your vehicle, it is most likely that the primary remote isn't working. Most problems with car remote keys are caused by circuitry or battery problems.

Battery

The battery in the key fob could be worn out over time. It is easy to replace the battery. However, it is important to select the right kind. You can consult the owner's manual or contact the manufacturer to inquire about the right type. It is also essential to examine the battery compartment as dead batteries can leak caustic chemicals that can harm the remote. If changing the batteries does not solve the problem it could be because there are other issues that require attention from a professional. If the buttons are damaged or stuck for instance it might be necessary to take the remote apart and rework each component. You can also try reprogramming the vehicle to recognize the new key fob.

Buttons

Through repeated use, key fobs could get dirty and worn. This is not atypical however, it can cause buttons to stop functioning or require a difficult press to get them to function. This can be very frustrating particularly if you're out of town and need to start your car. Even broken or damaged buttons can be fixed with a little effort and materials you already have at home.

First, make sure the batteries are properly charged and that the indentation on the back of the button is filled. Then, carefully open up the remote and look at the circuit board. Look for signs of corrosion or other signs that the buttons are worn out or damaged, such as missing paint that is conductive. Use a Q-tip dipped into alcohol to gently clean any membrane contact that is damaged or where conductive painting is missing. Do not rub too vigorously as this can damage the conductive paint, and block the button from firing when it is pressed.

Examine the battery connector's terminals for loose solder connections. Soldering them back in place will restore the button's functionality in the event that this is the case. The same method can be used to restore function to any other loose connections inside the fob.

If any of the rubber buttons at the front of the keyfob isn't working or need to be pressing very hard the graphite disks at the back of the button may have worn out and will require replacement. You can usually do this by rubbing a pencil over the disks. This should bring the button to life.


If none of this is helpful, or if the button does not respond to a hard push It could be the case that the circuit board is damaged. It is possible to fix this issue by cleaning and re-soldering the fob, but you should have an extra in case it does not work.

Circuitry

If the key fob buttons function the circuit board that is inside your remote might be dirty. repair car key fob can be fixed by a thorough inspection. Broken and damaged cases are the most frequent causes of dirty boards. A damaged case allows water and other debris to pass through and short out the electronic components. Water can also damage pins and vias, which are the tiny connectors found on the board.

If you're able to open your key fob and aren't afraid of making a mess, we can take the buttons out of their sockets and put in new ones. It's also worth checking the battery terminal connections. They can become very dirty and if they're loose the buttons might not function or may even remain in their down position. Soldering the terminals and button's back in place is usually all that's needed to return the key fob that is not working to functioning condition.

Non-Remote Transponder Chips

Sealed non-remote transponder chips are more durable than the remote fobs they are contained in, but they can be damaged by a hole that is drilled into them or run over by a lawnmowers blade or door handle for a car. Most of the time non-remote transponder chip failures can be blamed on blowing fuses.

If you're not confident opening the key fob, take the circuit board off and use a multimeter to check that the diode is functioning properly. If you don't feel comfortable with this, you can visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits signals.

Programming

Key fobs aren't indestructible and are susceptible to damage by a variety of factors. They can break their connection with the receiver inside your vehicle because of shocks or a low-battery, which requires the reprogramming. A professional auto locksmith, or the main dealer, can reprogram your keyfob to get it working again. In the rarer case that resetting and fixing your key fob isn't working it may be time to replace it entirely.