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Citroen C3 Key Fob Troubleshooting Citroen key fobs may malfunction due to a variety of reasons. The most common reasons are worn buttons and poor contact with the battery, water damage, and receiver module problems. Make sure the batteries are 12 volts. If the key fob does not unlock your car, you could be experiencing deprogramming. This happens when certain button sequences send an instruction to the onboard computer to remove the key from its list of access. Dead coin battery If your Citroen C3's key fob has stopped working The first thing you need to look for is if the battery is dead. The batteries contained in the fobs are small, round coins that can be easily changed in a matter of seconds. They are available at home improvement stores, and some auto parts stores. Make sure you purchase the correct model. The majority of fobs require CR2025 or CR2032 However, it is recommended to check the owner's manual to find out the specific type of battery your vehicle requires. Before you replace the battery, remove the button pad and rub it with cotton swabs and alcohol. They will remove the corrosion, and clean the contacts, which are typically gold-colored. After the contacts have been cleaned it is time to insert the new battery. Be careful not to mix the two kinds because they differ in their voltages and diameters. Next, you will need to check the voltage of the battery. You can get a precise reading using a multimeter, which is calibrated to the battery's voltage range. If the battery's current value is in the middle or above the threshold, it should be replaced. You may also try to start your car using an extra key, but this might not work in all cases. If the issue continues, visit a CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN dealer can retrieve the code for your vehicle's immobiliser system and order an alternative battery. Water damage If the key fob is submerged it can lose its signal. If this happens, it's a good idea to pull it out of the puddle, pool or washing machine as fast as possible. After this then use a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it may be time to get an additional one. Signal interference is a common cause of Citroen remote control not working. It can happen when there is an electrical field near the car or other transmitters using the same frequency. The key fob will begin to work again once you leave the area of interference. Finally, G28 can be inoperable due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or an indefective electronic chip. It will need to be reset if this happens. This can be done either by a trained mechanic or a Citroen dealer. If the issue is severe it may be necessary to replace the device. It's a simple and inexpensive fix, but it's crucial to act fast. If you put off fixing the problem, the worse it gets. If the problem isn't addressed, it can be dangerous for the passengers and yourself. Receiver Module Issue If your key fob is not functioning it could be because the receiver module might have developed a fault. This could be due to various factors, including water damage. It can happen when you drop your keys or wash them. You can attempt to fix the issue by taking off and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will keep the chip from corrosion. You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery to the car and repeat the process. If this doesn't resolve the issue, visit a dealership to get it replaced. Another reason why your key could stop working is due to interference. It could be caused due to other transmitters that operate on the same frequency as your key fob or by objects within your vehicle. If you're not able to fix the problem, you can go to a dealer to get your key fob reprogrammed. 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 is not right, the receiver will not recognize the car key and display a message telling you “key not recognized”. This can be a gruelling problem, especially when you're trying to start your car. Dead 12 volt battery If your key fob stops working after an upgrade to a battery the device could be damaged. This is especially true when the key fob has been dropped or stepped on, but it also can occur after service on your car that requires the removal and reinstallation of the panels. Wires become exposed when panels are removed. If your fob has been damaged, it might require replacement completely. Another possibility is that the fob may be receiving interference from other devices or locations. This could make RF signals weaker and hinder the car from recognizing the remote. You can reset the on-board computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will remove any remaining electrical charge and allow the system to restart over. It is essential to confirm the size and type of the battery before replacing it. The circuit board inside the fob's circuit board could be damaged when the battery you replace is too large or has an incompatible voltage. Before installing a new battery, you should clean the chip of the fob to remove any harmful substances. The correct type of battery can ensure that the key fob is sealed and shielded from moisture. After the key fob has been installed, it should work normally. In most instances, you will be able to use the second key to start your car if it shows a message saying “key not recognized.” It may be necessary to press the button a few times before it responds.