Common Reasons Why Your Car Remote Isn’t Working

Picture this – you have had a full day out and are about to get into your car by using your key fob to your car, only to realise your car key fob stopped working. No matter how many times you shake it or press the buttons, it is not responding. And now, you are stuck.

Having a malfunctioning car remote can be incredibly frustrating, especially when you rely on it for convenient access to your vehicle. Whether your key fob stopped working and it’s refusing to unlock the doors or failing to start the engine, several common issues can cause this issue. In this guide, we’ll explore the most frequent reasons behind a non-functional remote and provide tips on how to troubleshoot and resolve these problems.

Key Fob Battery Issues and Replacement

One of the first things to rule out when you suspect your car key fob not working is to check the battery for a dead or weak key fob battery. If your remote has become unresponsive or requires multiple presses to function, it’s likely time for a battery replacement. Fortunately, replacing the battery is a straightforward process that can often be done at home with minimal tools, allowing you to regain full control of your vehicle’s locking and starting functions.

Tip: If you have a BMW car experiencing car remote issues, explore this guide on changing the battery on a BMW key fob. 

Causes of Car Key Fob Malfunctions

Another main reason for a car key not working can stem from malfunctions that can arise from various factors, including physical damage, water exposure, or electronic interference. Even a small impact can disrupt the internal components, leading to unresponsive buttons or complete failure. Nearby devices emitting radio signals can also interfere with the fob’s frequency, preventing it from communicating effectively with your vehicle.

Damage and Wear

Over time, car key fobs can experience damage and wear due to daily use and exposure to the elements. Scratches, cracks, or broken buttons can hinder their functionality, making it difficult to lock or unlock your vehicle. Accumulated dirt and debris in the fob’s crevices can also interfere with the internal mechanisms, leading to inconsistent performance and potential malfunctions leading to a key fob not working.

Tip: To avoid malfunctions from damage and wear, keep your car remote in good condition by checking and replacing the battery (usually between every three to five years). Also, be sure to avoid exposing it to extreme temperatures and moisture. Store it in a protective case and clean the buttons with a soft cloth.

Reprogramming Needs

Sometimes, a car key fob may require reprogramming if it becomes unresponsive or loses its connection with the vehicle. A car key not working can occur after battery replacements, system updates, or changes to the vehicle’s security settings. Reprogramming can usually be done through a simple process outlined in the vehicle’s owner manual or by a car locksmith professional, ensuring that your fob syncs correctly with your car’s locking and ignition systems.

Radio Interference

Radio interference can significantly affect the performance of your car key fob, preventing it from communicating with your vehicle, and resulting in your car fob not working. This interference may be caused by nearby electronic devices, such as other car remotes, wireless routers, or even mobile phones, which emit signals at similar frequencies. If you notice your key fob is unresponsive in certain locations, relocating away from potential sources of interference may help restore its functionality.

Tip: If you store your phone and key fob together in a pocket or purse or bag, it is recommended to keep them separated. The reason is that the mobile phone can emit radio frequencies that can scramble the code of the key fob. However, while some care owners may never experience this interference, some have reported their key fob battery being drained more quickly after being kept near a phone regularly.

What to Do If Your Car Remote Key Stops Working

A car remote key not working can leave you feeling helpless, but there are simple steps you can take to troubleshoot the problem. Before assuming the worst, it’s important to check a couple of key components that could be causing the issue. A good place to start is always by checking and replacing the battery, along with assessing the condition of the transmitter or receiver, so you can get back on the road with minimal hassle.

Battery Check and Replacement

Performing a battery check and replacement is one of the simplest yet most effective steps to troubleshoot a non-working car remote key.

1. Start by opening the key fob to enter the battery compartment.
2. Carefully note the type and orientation of the existing battery.
3. If the battery is dead or weak, replacing it with a fresh one can often restore the fob’s functionality and get you back into your vehicle with ease.

Tip: If you specifically have a Mercedes, explore this guide on how to change the battery in a Mercedes key fob.

Damaged Transmitters or Receivers

Issues with receivers or transmitters can be a significant reason why your car remote key fails to operate correctly. Physical impacts, water exposure, or general wear and tear can compromise these components, preventing the fob from sending signals to the vehicle. If you suspect damage, inspecting the fob for visible issues and consulting a professional for repairs or replacements may be necessary to restore proper functionality.

Reprogramming and Replacing Your Car Key Fob

If your car key fob becomes unresponsive despite a fresh battery and no visible damage, it may need reprogramming or replacement. Reprogramming the fob can often resolve connectivity issues, allowing it to sync properly with your vehicle’s security system, a process that can usually be done at home using your owner’s manual.

However, if reprogramming doesn’t do the trick, the key fob no longer works or if the fob is beyond repair, replacing it through a dealership or a certified locksmith is the best way to recover full entry to your vehicle.

Tip: Make sure you always have a set of spare car keys in case of unforeseen issues. Keep them in a safe place that you can reach in times of a car key fob failure.

FAQs

Why is my car key fob not working even with new battery?

If your car key fob isn’t working even after replacing the battery, it may be due to issues like damaged transmitters or receivers, which can prevent effective communication with your vehicle. If these steps don’t resolve the issue, consider consulting a professional for further diagnosis and assistance.

How to start your car with a dead key fob?

To start your car with a dead key fob, first, locate the physical key hidden within the fob, which can usually be used to unlock the doors. Once inside, place the key fob against the start/stop button or designated ignition slot, as some vehicles allow for a backup start even without battery power in the fob. If your car requires the fob to be functional for ignition, you may need to jump-start the vehicle or replace the fob’s battery to get it running.

What is the life expectancy of a key fob?

The life expectancy of a key fob typically ranges from three to five years, depending on usage and environmental factors. Frequent use, exposure to extreme temperatures, and physical wear can shorten its lifespan. Regularly checking the battery and the fob’s condition can help you anticipate when it might need replacement.