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G28CarKeys not working are most often the result of the battery being dead. Other causes are water damage and an incorrect replacement of the battery. You should always hire a professional, regardless of the cause of your main malfunction. They will be able to offer the most effective solution to your specific problem. Key to Immobilizer Lock for Lost Ignition If you're unable start your vehicle, the issue might be with the ignition immobilizer system. This is a feature that hinders thieves from starting your car in particular if they don't have the correct key to start the engine. The best way to fix this issue is to examine the battery in your key fob. If it's dead, replace it with another one. This should resolve the issue and allow you to start your car. If your car is older and has an integrated transponder chip in the key. When the key is inserted into ignition, the transponder sends an ID code to the ECU. The computer recognizes the code and activates both the fuel system and the ignition circuit. The engine will then start and the security light will stop flashing. These keys are more complex and feature a more sophisticated engine immobilizer. This system requires the FOB to be in the vehicle for the engine to be started and to remain in the hands of the driver so that the vehicle can continue running. It's expensive to replace your FOB if you lose it, especially for some models. This is why it's important to ensure that your key FOB is secure and in good shape. A lost key can cause costly repairs or even a complete lockout which is why it's essential to keep a spare on hand. Remote Key Not Locking or Unlocking Get a locksmith to assist you if your car's key fob won't not lock or unlock. It could be due to a number factors, including water damage or malfunctioning buttons. Other causes are signal interference and a dead battery of 12 volts. A locksmith will be competent to reprogram the key for your vehicle to ensure that it functions correctly again. Before you call a locksmith and try using your spare key to lock and unlock the car. This will help to rule out an issue with the key fob itself. If the spare key does not work, it is likely that you have a problem in the receiver module of your car. Modern cars are extremely complex and often have many electrical systems that are working at once. If one of them is acting up it could result in seemingly disconnected issues. It is important to determine the root cause of any new issues prior to replacing anything. It is also advisable to find out if there's another issue, for instance an issue with the software or a door lock that is powered that's not working. These issues could be more expensive to repair than a dead battery for the key fob or a lost ignition immobilizer key. If you're having issues, it's best consult a professional get it fixed quickly and affordably. Keyless Entry System Problems Almost all modern cars are equipped with remote keyless entry systems. When you push the fob button to lock or unlock your vehicle, it sends an alert that disables the standard immobiliser mechanism inside the engine control unit (ECU). If this chip is faulty the car will not start. If you are seeing the error “Key not detected” on your vehicle, it is a clear sign that the battery of your key fob has failed. The button cell battery can be replaced with ease inside your key fob and it will allow the key fob to be able to communicate with the vehicle once more. The exposure to water can also harm the key fob's electronic components particularly in saltwater settings like an ocean or swimming pool. The rubber seals on the fob's key should protect the chip from damage. However in the event that the fob is submerged in water, the chip can be damaged and must be replaced. Other problems that can cause the fob to cease functioning include a dead battery, receiver module issues and interference from nearby transmitters or having the key reprogrammed if it's not properly paired. If your key fob is not working as it should, it is recommended that you consult with an auto locksmith expert to determine the reason and repair it. Many people go to their local Fiat dealer when they experience key fob issues, but this can be costly and inconvenient. Instead, contact us at Car Keys Solutions for a fast and affordable solution to your issue. Dead Coin Battery When they have problems with their Fiat key most people will visit their Fiat dealer. However it can be an expensive option. Our team at Car Keys Solutions are able to provide you with an efficient and cost-effective solution that can get you back behind the wheel as fast as possible. Button batteries and lithium coin cells stop working devices long before they are completely depleted So what we think of as a dead battery still has enough charge to hurt the child if it is caught in their ear, nose or throat, or swallowed. Wrap old batteries in a piece of tape before throwing them away. To replace a dead battery, carefully remove the circular coin-cell battery module from its housing and replace it with a new one. Re-insert the battery carefully, then screw the strip of plastic back into its it's place.