20 Irrefutable Myths About Car Key Immobiliser Repair: Busted

· 6 min read
20 Irrefutable Myths About Car Key Immobiliser Repair: Busted

Car Immobiliser Repair

In the late 20th century, automakers began to use immobilisers for cars because hot-wiring was becoming more popular with thieves. The immobiliser blocks your car's engine from starting in the event that the chip inside the key fob is damaged or doesn't match.

This means that it is crucial to get your car's immobiliser repaired promptly if it's malfunctioning or damaged. Here are a few common causes for your car's immobiliser not working:

Dead Batteries

A dead battery is one of the most common causes of key fob problems. Batteries can fail due to prolonged usage or exposure to harsh environmental conditions or simply ageing. When a battery fails, it can no longer transmit the signal required by the immobiliser to operate the key fob. This could stop the vehicle from starting, resulting in the requirement for a professional technician to complete an repair to the immobiliser system.

Most times an easy replacement is all you need to revive an old battery and get it back to working. You can buy a high quality coin-styled batteries at your local hardware store, or even from some general retailers for around $5-10. Once you've purchased a new battery, remove the old one from the fob, and carefully open the case. Look for a slot or notch along the edge that separates the top and bottom halves of the fob. Push the tip of an flathead screwdriver or coin into the slot, and then move it around the edges. Then, you can insert the new battery and snap the two halves of the fob closed. Once you've finished your work, you can reuse the old battery at a nearby battery collection site.

If the new battery doesn't fix the problem, it may be an issue with the RFID system in the key fob itself. In most vehicles with push-button ignition, the fob is required to be positioned close to the barrel of ignition to confirm its presence. If the RFID inside the key fob cannot communicate with the vehicle, you will be required to have a replacement key made or go to a dealer to fix the immobiliser.

If changing the battery does not solve the issue, it may be worth taking the key fob apart and examining the buttons that seem off-center or damaged. It's normal for buttons to become dislocated over time, since your key fob is likely to be jostled around a lot.

Key for the Transponder that isn't working

A transponder key that's not working could have severe consequences. Transponder keys differ from conventional keys made of metal, which engage the ignition mechanically. They are equipped with an electronic microchip which sends a unique number to the immobilizer system of the vehicle to verify its identity. This adds an additional layer of security that reduces the possibility of theft and other forms of vehicular crime. However, as with any other electronic device, transponder keys are susceptible to a range of issues, including those related to the functionality of the chip.

Transponder chips are delicate and even a small physical damage will affect their capacity to function. This is the reason it's essential to regularly inspect your transponder key for indications of wear and tear as any such damage can be the direct cause of a malfunctioning car immobiliser.

The microchip in the internal circuit of transponders are also sensitive to humidity and other environmental conditions. This can interfere with the ability of the key to communicate with an immobilizer system. It is therefore essential to keep the key fob and the keychain as far away from water as possible.

It's also important to note that a transponder is specifically programmed to a specific vehicle, and changing any sensitive parts can lead to compatibility issues that can affect its functionality. As a result, it's best to avoid any form modification to a car key as long as you have the expertise and tools to do it safely and efficiently.

If you're in the unfortunate position of having an old key that is in need of repair or replacement, a professional locksmith will be able to help you out. They can duplicate your key or design a brand new one, and program it to match the immobilizer mechanism of your vehicle, ensuring that it works correctly. This isn't as straightforward as copying a standard car key made of metal. it requires the use of specialized tools to ensure that all of the correct information is entered into the software.

A faulty Receiver or Antenna

The transponder chip on your car key transmits an electrical signal to the ECU that allows it to verify whether the key is the correct one to start the car. The immobiliser prevents the engine from starting if it's not the correct key. This is a way to prevent thieves from using stolen or cloned keys to gain access to your vehicle's motor.

If the signal isn't accepted by the ECU because of a problem with the antenna or the receiver the car won't start. A professional auto locksmith is able to help you resolve this problem.


This could be due to a number of reasons which include an antenna that isn't compatible or electrical interference issue. Radio frequency interference could be caused by heavy electrical equipment, lighting systems computers, computers, digital devices cable television systems, and transmitters. It's also possible that a coaxial antenna cable is damaged or disconnected. This could happen when pets run around the house or the cable is bent or damaged during installation.

Another reason that the antenna may not be working is that the receiver may be too far from the antenna. You can test this by connecting the receiver to another antenna. If the error message persists, you might need to replace the antenna or redirect the coaxial cable.

Antennas aren't good, but they could be twisted, pinched or loose from their connectors, which can cause the RF level of the signal to decrease. Examine if there's anything between the receiver and antenna such as a surge protector, splitter, or splitter that could impact the signal strength.

If you use the EEPROM method to program the car key, you will have to remove specific modules (security components) from your vehicle and read the "password" from them. This requires a great deal of knowledge, as there is a chance that the data may be damaged. A professional auto locksmith has a comprehensive knowledge of the circuit board and can reduce the risk by reading data directly from the module with an instrument that is specifically designed for this purpose.

Faulty Electronics

A lot of modern cars are equipped with security systems that block the engine from starting if the car fob or key isn't in the car. These systems make use of RFID (Radio Frequency Identification) or immobiliser controls to authenticate a key or fob that is put into the ignition. It's an effective way to reduce car crime, but it can also go wrong.

If the security light on your dashboard is solid, it indicates that the car immobiliser isn't receiving the signal from the key or fob. This could be due to a variety of things, including an insufficient battery on the keyfob, or physical damage on the key. If you are experiencing this problem follow the instructions provided by the manufacturer to reset the system or seek help from a professional.

When you put the transponder chip inside your key, it transmits a code to the immobiliser system in your car that is then compared to codes that are stored in the computer. If the codes match the engine will begin and the immobiliser will shut off. If the immobiliser is unable to detect the signal it will not turn over and you could be left stuck.

There are a variety of issues that can cause the car's immobiliser to stop functioning correctly, but the majority of them are relatively easy and affordable to fix. The most common cause is a dying or dead key fob battery which can be identified by a quick diagnostic test. If this does not solve the problem, it could be due to other issues with the electrical system in your vehicle that are impacting the functioning of the immobiliser. If this is the case, a professional should look over the wiring of your car and look for signs of damage or loose connections that may be impacting the performance of your vehicle.

A car key immobiliser is a way to secure your vehicle from unauthorized access.  automotive key repair  are generally safe, but they can occasionally go wrong and need to be replaced or repaired. You can prepare for the odd glitch by knowing the most common symptoms and causes.