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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it easy to open doors and start your car. There are a myriad of reasons the fob could stop working. G28 could be due to a dead coin-battery and water damage, as well as receiver modules issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It must be professionally programmed (click here to search for local locksmiths for your vehicle). This remote includes lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason that the 500 key fob won't work is the battery is dead. Modern key fobs only have only a limited range of operation and must be within just a few inches of the vehicle to work. If you are far from your vehicle when you press the key fob button, the car will not respond, and will display a “Key Fob Not Detected” message in the instrument cluster. If this happens, replace the battery of your coin cell (Part number CR2032) with a brand new one from a reputable brand such as Panasonic, Duracell, or Energizer. They are typically available at your local hardware store or on the internet. After you've changed the battery on the coin cell It is possible to test it by standing close to your Fiat 500 and pressing the buttons. The car should blink its parking lights, and the key fob should operate the lock and unlock buttons. If your key fob still isn't working even after replacing the battery, there may be water damage that hinders it from interacting with the module in your vehicle. Water damage can occur through a variety of methods, including simply splashing or submerging your key fob in saltwater at the beach. If you suspect your fob was exposed to water, put it in a dry rice bag to draw the moisture back out. If this isn't working, you'll require your fob to be reprogrammed either by an auto locksmith or dealer. Water Damage Water damage can occur when you immerse the fob in the ocean or wash it in a washer. Saltwater can cause the circuit board to become shorted and eventually cease to function. In the event that you let your fob get wet, it's not an option but if you accidentally drop it into an empty cup of water, or do not remember to remove it from your pants pocket prior to running the washing machine and you don't have a chance, don't give in. First remove the battery from the fob. Before replacing the battery clean the electronic chip using isopropyl or a similar product. Test the fob next to see if it is working. If the key does not work, it might need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If your key is a bit older and has not been programmed for your car, you will need to replace it completely. This is a simple procedure that can be completed by a professional automotive locksmith. The locksmith will need the key cut to match the car's ignition. The locksmith will also have to reprogram the fob into the car's system. This is a cheap and fast process that can be completed in the same day. Receiver Module Issues Your 500 key fob might stop working because it is out of range. The remote typically has an operating range of 30 feet or less and if it's far from your vehicle, it won't respond to your commands. This can be easily fixed by moving closer to your vehicle until it starts responding. If you've replaced your coin battery (commonly called”button” or “button” or “watch”) and your fob still won't work it could be due to an internal circuit board issue. Reprogramming the fob usually resolves this issue. You can find the procedure for the majority of vehicles on YouTube or in the owner's manual. You may have to replace the metal retaining clips that hold the coin battery. If they lose tension it can prevent your coin battery from sitting properly, causing your remote to malfunction. In rare instances, the fob can become out of alignment with your vehicle because of hardware or software issues. This could be a huge problem, but you can usually fix it by visiting an auto locksmith to reprogram your fob for you. In certain instances they may have to install the software again in your body control module, too. Interference Interference can also cause the key fob not to receive or transmit a signal. This could happen when the keyfob's location is in close proximity to a radio transmitter, like a cellphone or radar detector. The key fob could not work because of a weak connection to the buttons or water damage, or damage to the internal chips. If the key fob has suddenly stopped working, suddenly and you've tried everything you can at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, you might have a defective receiver module on your 500. The receiver module, which is located under the dashboard, receives radio frequency signals from your key fob. It converts the signals into electronic commands which are then interpreted by the vehicle. Luckily, there is an easy method to reset all of the onboard systems in your 500, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Then, reconnect the battery. This will remove any remaining electricity and then restart the car's computers, which could help get your key fob working again. If the issue continues, you should consult a certified technician. They will be able to determine the root of your issue.