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How to Repair a Key Fob If you can't unlock your key fob to start the vehicle, it could be time to take it to an automotive repair shop. Before you visit an automotive service it is important to first verify the following things. The most obvious reason that your key fob isn't functioning is that it has a dead battery. Most key fobs are powered by traditional 3V button cells that are sold in the majority of stores. Dead Battery Your key fob's battery is responsible for powering the remote fun