Watch Out: What Car Key Immobiliser Repair Is Taking Over And What Can We Do About It

· 6 min read
Watch Out: What Car Key Immobiliser Repair Is Taking Over And What Can We Do About It

Car Immobiliser Repair

In the latter part of the 20th century automakers began using car immobilisers because hot-wiring was becoming more popular with thieves. The immobiliser blocks the engine of your car from starting in the event that the chip inside your key fob is damaged or does not match.

It is crucial to repair your car key immobiliser immediately if it starts to fail or is damaged. Here are a few most frequent reasons for the immobiliser on your car not working:

Dead Batteries

Key fob issues are usually caused by batteries that are dead. A battery can go bad through long-term use or exposure to harsh environmental conditions, or simply aging. If a battery is damaged in its function, it will not transmit the signal required by the immobiliser, and operate the key fob. This can prevent your vehicle from starting and may require a professional to repair the immobiliser system.

In the majority of cases, a simple replacement will bring back an old one. A good quality coin-style battery is available at a local hardware store or at some general retailers for between $5-10. Once you've purchased a brand new battery, take the old one from the fob and then carefully open the case. You'll find an opening or notch on the seam separating the bottom and top halves. Push the end of the screwdriver, either flathead or coin, into the slot and then work around the edges to open the fob. Then, insert the new battery and then snap the two halves of the fob shut. After that, you can recycle your old battery at a collection center close to you.

If the new battery does not solve the issue it could be an issue with the RFID system in the key fob itself. In most vehicles that feature ignition that is push-button, the fob is required to be positioned close to the ignition barrel to confirm its presence. If the RFID in your key fob isn't able to communicate with the vehicle, you'll have to have the key made for your vehicle or take it to the dealership to have an immobiliser repaired.

If changing the battery does not solve the issue it's worth taking the key fob apart and looking for any buttons that seem to be not in the right place or are damaged. Since your key fob likely is frequently tossed around as you use it and it's not common for certain buttons to become displaced or stuck over time.

Faulty transponder key

A transponder key that is defective could have severe consequences. In contrast to traditional keys made of metal, that mechanically engage the ignition, a transponder key is equipped with an electronic microchip that transmits an unique code to the immobilizer system, which confirms its identity before being able to start the engine. This provides an additional layer of security, decreasing the chance of thefts and other vehicle-related crimes. But, like other electronic device transponder keys are subject to a myriad of issues, including those related to the chip's functionality.

Transponder chips can be delicate and even a minor physical damage will affect their ability to work. It is crucial to examine your transponder keys for signs of wear, since these could be the reason for a malfunctioning immobiliser.

The microchip in the internal circuit of a transponder is also sensitive to moisture and other environmental conditions.  key repair near me  could affect the ability of a key to communicate with an immobilizer system. Therefore, it is important to keep the key fob as far away from water as you can.

It's also important to remember that a transponder key has been specifically programmed for a specific vehicle, and modifying any part that is sensitive can lead to compatibility issues that can affect the functionality of the key. As a result, it's recommended to avoid any type of modification to a car key, in the absence of the appropriate knowledge and tools to do it safely and efficiently.


A professional locksmith can assist you if your key requires to be repaired or replaced. They can duplicate your key or design a new one from scratch and will be able to program it to match your specific vehicle's immobilizer, making sure that it works as intended. This isn't like copying a car key made of metal. It requires special tools to ensure the software is programmed correctly with the proper information.

Faulty Receiver or Antenna

The transponder chip in the car key sends a signal that is recognised by the ECU to verify that it is the correct key that can start the vehicle. If it's not then the immobiliser will prevent the engine from starting. This is to stop thieves from accessing your vehicle's engine using stolen or cloned keys.

If the signal fails to get to the ECU because of a problem with the receiver or antenna the car won't begin. A professional auto locksmith is capable of helping you solve this issue.

This can be down to a variety of causes which include an antenna that isn't compatible or an electrical interference issue. Radio frequency interference can be caused by heavy electrical equipment lighting systems computers, digital devices, cable television systems and transmitters. The coaxial antenna cable may be damaged or disconnected. This could occur when pets roam around the house or when the cable is twisted or pinched during installation.

The receiver might be too far away from the antenna. Connect the receiver to a different antenna and check. If the error message is still present, you might need to install a better antenna or reroute the coaxial cable.

Antennas aren't bad, but can be bent, pinched, or come loose from their connectors, which can cause the RF level of the signal to drop. You should also check whether there is any equipment between the antenna and the receiver, like a surge protector or splitter, since this can affect the signal strength.

If the EEPROM programming method is employed to program a new car key, it will require extracting specific components from your car (security components) and reading the "password" and stored data from them. This requires a great deal of expertise, since there is a possibility that the data may be corrupted. A professional auto locksmith has a deep understanding of the circuit board and can minimise this risk by reading the data directly from the module using a special tool.

Faulty Electronics

Many modern cars have security systems that prevent them from starting the engine if they don't have the remote or key to the car. These systems make use of transponder chips, RFID (Radio-Frequency Identification) technology or immobiliser control units to authenticate the keys or fob once it's placed in the ignition. It can be an effective way to reduce the crime in vehicles however, it can also be a disaster.

If the security light on your dashboard is solid, that means the car immobiliser isn't receiving the signal from the fob or key. This can be caused by a variety of things, including a battery that is depleted on the keyfob, or physical damage on the key. If you're experiencing this problem follow the instructions provided by the manufacturer to reset the system, or consult a professional for help.

When you insert your transponder into your key, the chip sends an alert to the immobiliser system of the car. This code is then compared against the codes stored on the computer. If the codes are the identical, the engine will be turned on and the immobiliser shuts off. If the immobiliser doesn't detect the signal, it will prevent the engine from turning and may leave you stuck in a secluded place.

There are a myriad of issues that could cause your car's immobiliser to stop working correctly, but the majority of them are relatively easy and affordable to fix. A dead or dying keyfob battery is the most common cause, and can be identified quickly by an easy diagnostic test. If this does not solve the issue, it may be that there are other issues with the electrical system of your vehicle that are affecting the immobiliser's function. If this is the situation, a professional must examine your car's wiring and look for signs of damage or loose connections that could be affecting the performance of your vehicle.

An immobiliser for your car key is an essential security feature that can help protect your vehicle from unauthorized access. They are generally safe, but they can occasionally go wrong and need to be replaced or repaired. If you are aware of the most common causes of these issues and knowing what signs to look for, you can be prepared for the occasional incident.