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How to Repair a Key Fob It could be time to bring your vehicle to an automotive service if you are unable to get the key fob to function. However before you make that decision there are a few things you should examine first. The most obvious reason your key fob isn't functioning is that it has a dead battery. Luckily, most key fobs run on standard 3V button cell batteries that are easily available at the majority of stores. Dead Battery The battery on your key fob is responsible for charging the remote function