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How to Repair a Key Fob It may be time to bring your vehicle to an automotive service if you're unable to get the key fob to function. Before you go to an automotive service it is important to first verify the following things. won't work is a dead battery. Fortunately, most key fobs run on normal 3V button cell batteries that are readily available at all stores. Dead Battery The battery in your key fob is responsible for providing the remote functions that let you unlock your car, open the trunk or tailgate a