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How to Fix a Key Fob That isn't Working If your key fob isn't working A few easy steps can fix it. The first step is to make sure it's not the backup remote. If the backup can lock and unlock your car doors, then there's a likely issue with the primary remote. The most common causes of key malfunctions for car remotes are battery or circuitry issues. Battery It is not unusual for the battery in the key fob for cars to wear out. It is relatively easy to change out a battery, although it is essential to make s