What Happens When Key Fob Battery Dies. Answer 1 of 9. Remove key from the key fob.
There is still a way to start the car if you have a start button and a mechanical key slot. If the spare key fob does not start the engine the problem isnt a dead key fob battery or defective fob. Stick the fob in the notch and turn it to the right as if you were starting a car with a regular key.
If the battery completely dies the fob chip will also lose power and become useless unless reprogrammed directly by the automotive manufacturer.
I left it running in case they needed to check mileage etc. If the battery completely dies the fob chip will also lose power and become useless unless reprogrammed directly by. As the fob battery becomes weaker the transmitter loses its range. It happens to thousands of drivers every day.
