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Citroen C3 Key Fob Troubleshooting The Citroen c3 keyfob may stop working for various reasons. The most common reasons are worn buttons or poor contact with the battery, water damage and receiver module issues. It is also recommended to check the battery's 12 volts. If your key fob does not unlock your car, you may be experiencing deprogramming. This happens when certain key sequences send a signal to the onboard computer to remove the key from its list of access. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer working, first make sure the battery has died. Fobs utilize small coins-shaped batteries that can be replaced in just a few minutes. They are available at general stores, home improvement stores, and a few auto parts stores. Be sure to purchase the correct model. Fobs typically require CR2025 or CR2032 However, it is recommended to check the owner's manual to determine the type of battery your vehicle requires. Before you replace the battery, remove the button pad and rub it with cotton swabs and alcohol. This will help remove corrosion and clean the contacts which are typically colored gold. After cleaning the contacts it is time to insert the new battery. Be careful not to mix up the two batteries as they differ in voltage, sizes and diameters. Next, you will need to assess the voltage of the battery. A multimeter that is calibrated to the battery's voltage range should give you a reliable reading. If the battery is at an amount that is above or below its threshold, it has to be replaced. You may also be able to start your car with a spare key. However, this may not always work. If the problem continues, visit an CITROEN dealership with your V5 registration as well as personal identity documents. A CITROEN Dealer can obtain the code for the immobiliser on your vehicle and purchase a new battery. Water damage If the key fob is submerged it could lose its signal. If this occurs, it's a good idea to fish it out from the pool, puddle or washing machine as quickly as possible. Once you do, dry out the circuit board in the best way you can with a cotton swab dipped in isopropyl alcohol or electronic cleaner. If it still doesn't work It could be the right time to purchase a new key fob. Signal interference is a different cause of Citroen remote controls not working. This can occur when there is a strong electrical field that is close to the car or from other transmitters on the same frequency. The key fob is expected to begin to work again once you leave the area of interference. Finally, the Citroen C3 key fob might not function due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or a malfunctioning electronic chip. It will need to be replaced when this happens. This can be done by a qualified mechanic or an Citroen dealer. If the issue is severe you may have to replace it. It's an easy and inexpensive fix. But you have to take action quickly. The longer you wait to fix the issue, the worse it gets. If the issue isn't fixed, it can be dangerous for the passengers and yourself. Receiver module issue If your key fob stops working, it might be due to the receiver module having developed an issue. Water damage is one of the numerous reasons. This can happen if drop your keys or wash them. You can fix the problem by taking off the chip and cleaning it with isopropyl, or electronic cleaner. This will keep the chip from becoming corroded. You could also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 seconds. You can then reconnect the battery and repeat the process. If this doesn't fix the issue, visit a dealership to get it replaced. Interference can also cause your key to stop working. It could be caused by other transmitters that utilize the same frequency as your key fob or by objects within your vehicle. If you're not able to fix the problem, you can visit a dealer to have your key fob reset. The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal doesn't match the receiver module will not recognize the key and display a message that says “Key Not Detected. This could be a very frustrating issue, particularly when trying to start your car. Dead 12 volt battery If your key fob stops working after changing the battery, it may be damaged. This is most likely to happen when the key fob been thrown around or stepped on however, it can also occur after a service that requires the removal of panels and the reinstallation. Wires become exposed when panels are removed. If your fob has been damaged, it may require replacement. A fob that receives interference from other devices and locations is a different possibility. This could make RF signals weaker and prevent the car from being able to recognize the remote. If G28 is the case you can reset the on-board computers by disconnecting the battery that is 12 volts for about 15 minutes. This will eliminate any remaining electric current, allowing your system to restart. It is important to check the size and type of the battery before replacing it. If the battery you replace isn't big enough or has a different voltage, it could harm the circuit board in the fob's key. Also, you should clean any corrosive material from the chip inside the fob before installing a new battery. Using the right type of battery will ensure that it is sealed and shielded from moisture. Once the key fob's been reinstalled it should function normally. In the majority of instances, you will be able to use the second key to start your car, even when it displays a message saying “key not found.” It is possible to press the button multiple times before it responds.