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Key fobs are a modern convenience that most of us take for granted – until they stop working. If your key fob is malfunctioning, there are several possible reasons. The most common issue is a dead battery, which is easily fixed by replacing the battery or purchasing a new fob. If you've dropped your fob in water or otherwise damaged it, that could be the culprit. Sometimes, the fob may simply need to be reprogrammed. In rarer cases, the problem may lie with your car's battery or locks. If simple fixes don't work, it's best to consult a professional locksmith or your car dealership for help.

Dead key fob battery

A dead key fob battery is one of the most common reasons your key fob may not be working. The battery in your key fob is usually a coin-shaped lithium battery, which lasts for several years. Over time, the battery gradually loses its charge, and you may notice that the fob's range is reduced or that it takes several attempts to unlock your car doors.

To fix this issue, you can replace the battery. This typically involves removing a few small screws from the fob, opening it up, and replacing the old battery with a new one. The battery type is usually a CR battery, which you can purchase for between £5 and £10 at most shops and garages. When replacing the battery, ensure that you match the positive and negative polarities before closing the fob and screwing it back together.

If your key fob still doesn't work after replacing the battery, there may be other issues with the fob, such as broken buttons or damaged internal components. In this case, you may need to take it to a professional for repair or purchase a new key fob.

It's also worth noting that the problem may lie with your car itself and not the key fob. Your car battery could be dead, or there could be an issue with the locks on your car doors. Using a spare key fob can help determine whether the problem is with the key fob or the vehicle.

Damaged key fob

A damaged key fob can be a frustrating experience, leaving you stressed and stranded. There are several reasons why your car key fob may have stopped working due to damage. Here are some common issues and potential solutions to help you get back on the road:

Battery Issues

The most common issue with key fobs is a dead or dying battery. If your key fob isn't working, the first thing to check is the battery. Temperature changes can cause battery fluctuations, so try replacing the battery with a new one. This is a simple and inexpensive fix, and new batteries can be purchased at most auto parts stores.

Reprogramming

If you've recently changed the battery in your key fob, it may need to be reprogrammed to your vehicle. This is especially true if your car's onboard computer has been reset. Reprogramming can usually be done by a dealership or a locksmith, but some older vehicles may have DIY programming procedures.

Physical Damage

Physical damage to the key fob, such as dropping it or exposing it to water, can also cause it to stop working. If the fob has been damaged, you may need to take it to an authorised service centre or a locksmith to have it repaired or replaced.

Electrical Malfunctions

If your key fob is not working due to electrical malfunctions in your car, the issue may lie with a faulty fuse or the ignition switch. In this case, you will likely need to consult a mechanic or an auto locksmith to diagnose and fix the problem.

Incompatible Aftermarket Key Fobs

If you've purchased an aftermarket key fob, it may not be compatible with your vehicle. This is because the receiver and transponder in your car are programmed to communicate with each other, and the aftermarket key may not have the correct programming. Consult a professional before trying to use an aftermarket key fob to avoid any issues.

Signal Issues

If your key fob is not sending a signal, it could be due to a dead battery or a broken key. Try replacing the battery first. If that doesn't work, use a remote tester to check if a signal is being sent when you press the buttons. If no signal is detected, the key fob may be damaged and need replacement.

Remember to always have a spare key fob, and if you're unsure about the cause of the issue, consult a professional locksmith or mechanic for assistance. They will have the tools and expertise to diagnose and resolve the problem.

Faulty car battery

A car that won't start is a major headache, and a faulty car battery could be the culprit. Here are some detailed instructions on what to do if your key fob is not working due to a faulty car battery:

Check for Human Error:

Before jumping to conclusions, it's important to rule out any possible self-inflicted issues. Are you using the correct key fob? Did you accidentally leave your transmission in Drive or Reverse? Is your fob too cold to function? Try warming it up and then test it again. If you have a second fob, try that one instead and see if it works.

Check the Key Fob Battery:

The most common reason for a key fob to stop working is a dead battery. The transmitter in your fob is powered by a coin-shaped lithium battery, which eventually loses its charge. Check if the fob's range has reduced or if it takes multiple tries to unlock your car. If so, replace the battery with a new one. You can find several instructional videos online by searching for your car's make and model.

Inspect the Fob for Damage:

If replacing the battery doesn't work, carefully open the fob and inspect its internal components for damage. Look for cracks in the circuit board, loose or detached electronic components, loose or out-of-position buttons, and bent or oxidized battery contacts. If you spot any damage, you may need to replace the fob and have it programmed for your car. Contact your mechanic for cost-effective suggestions.

Try the Physical Key:

If your key fob is not working, some fobs have a physical key built into them. Try using this key to open the car door. You can check your owner's manual for instructions on removing the key from the fob and accessing the door locks.

Reprogram the Fob:

Your key fob may need to be reprogrammed, especially if you've recently replaced the car battery or the fob battery. Check your owner's manual for instructions on reprogramming the fob for locking and unlocking your car. For starting the car, you may need assistance from your mechanic or an automotive locksmith due to security features.

Check for Radio Interference:

If you're in an area with strong radio frequencies, such as near a Wi-Fi router or your cellphone, this could be interfering with your key fob's signal. Try moving away from these sources of interference, turning off your Wi-Fi hotspot, and then attempting to start your car again.

Check the Car Battery:

If your key fob is not working due to a faulty car battery, the problem may lie with your vehicle's power source. Use the physical key to open the car door and check if the interior lights come on. If there's no power, your car battery may be dead. Contact your mechanic or roadside assistance for help.

Remember to stay calm and methodically work through these steps if you find yourself in this stressful situation.

Key fob needs reprogramming

If your key fob is not working, it may be time to reprogram it. Reprogramming a key fob is a simple process that can be done at home or by a professional. The exact procedure depends on the make and model of your car, so it is important to refer to your vehicle's owner's manual or seek professional assistance for specific instructions. Here are some general steps to reprogram your key fob:

• Replace the batteries in your key fob if you haven't done so in a while. This can help avoid issues during the reprogramming process.
• Get inside the car and close all the doors.
• Insert the key into the ignition and turn it to the 'On' position without starting the engine. Make sure the ignition is not in radio mode.
• Press the lock button on the key fob and turn the key back to the 'Off' position. Repeat this process at least three times, ending with the key in the 'On' position.
• Listen for a lock sound, indicating that your car has entered programming mode.
• Press the lock button on your key fob again within five seconds to complete the programming.
• If you have additional key fobs to program, press their lock buttons within 10 seconds after hearing the door lock sound.
• Turn off the ignition to terminate the programming procedure.
• Test the key fobs by trying the lock and unlock functions outside the car.

If you are unable to reprogram your key fob successfully, you may need to contact a locksmith, your car dealership, or a local auto repair shop for assistance. They can help you reprogram your key fob or provide other solutions if the issue persists.

Damaged receiver

If your key fob is not working, there could be an issue with the receiver inside your vehicle. The receiver is a device that receives signals from the key fob, allowing you to unlock and start your car. If the receiver is damaged or faulty, it won't be able to pick up the signals from your key fob, resulting in your car not responding as expected.

To determine if the issue lies with the receiver, try the following:

Try the Spare Key Fob or a Different Key

If you have a spare key fob, try using it to see if your car responds. This will help rule out the possibility that the issue is specific to your primary key fob. Additionally, if you have another car with a smart key system, try using that key fob as well. This will help you narrow down whether the issue is with your key fob or the car's receiver.

Check for Obvious Signs of Damage

If possible, carefully open the fob and remove the battery to get a better view of the internal components. Look for any signs of damage, such as cracks in the circuit board, loose or detached electronic components, misaligned or broken buttons, or damaged battery contacts. Even if you don't spot any obvious damage, there could still be an issue with the receiver.

Try Placing the Fob Near the Door Handle

Place the key fob right next to the outside door handle and try to unlock the door. If this doesn't work on either of the front doors, it's likely that the receiver is not functioning properly. Contact your mechanic to diagnose and repair the issue.

Check for Radio Interference

Strong radio frequencies from nearby sources, such as cell phones, Wi-Fi routers, or even your car's Wi-Fi hotspot, can interfere with the signal from your key fob. Try moving away from these devices or turning them off temporarily to see if your key fob works.

Consult a Professional

If none of the above solutions work, it's best to consult a professional mechanic or automotive locksmith. They will have the expertise and equipment to diagnose the issue accurately and suggest the necessary repairs.

Frequently asked questions