Do I have to reprogram my key fob if I change the battery?
No. You do not need to reset or reprogram your key fob after replacing the cell. Your key fob does not use a battery.
For your remote key fob to work properly, it has to be connected to a receiver in the vehicle. When the battery in the fob is replaced, it can sometimes interfere with the paired connection between key and car, in which case you'll need to reset it.
HOW TO RESET KEY FOB AFTER CHANGING BATTERIES - YouTube
Depending on the age and model of your car, you may be able to program a replacement yourself. The procedure for do-it-yourself key fob programming can vary: Some automakers provide instructions in their owner's manuals. Information can be found in many cases on the internet.
Make sure none of the remote buttons are jammed or stuck. The remote control battery terminals may be dirty. Remove the batteries and clean the remote control terminals with a small solution of alcohol, using a cotton bud or soft cloth, then place the batteries back into the remote control.
We have nearly every make and model car key fob in stock and can program it while you wait.
Dead key fob battery
A bad battery in the key fob is most commonly the reason for a failure to send signals to the keyless entry system. If it is available, use the spare key fob to open the vehicle and start the ignition. If the spare fob is not available, use the provided key embedded in the fob to unlock the door.
Answer: Key fobs are typically programmed by a locksmith. The cost for programming a key fob typically ranges from $85 to $400. Key fobs, otherwise known as a remote fobs, are conventional for most automobiles these days.
To program your keyless-entry remote, press and hold the "LOCK" and "UNLOCK" buttons on the key fob simultaneously until the locks cycle once more. This could take up to 30 seconds, so be patient. Once you hear the locks cycle, your key fob should be programmed to your GM.
To program your keyless-entry remote, press and hold the "LOCK" and "UNLOCK" buttons on the key fob simultaneously until the locks cycle once more. This could take up to 30 seconds, so be patient. Once you hear the locks cycle, your key fob should be programmed to your GM.
How do I reprogram my Chevy key fob?
On your Chevy key fob, press and hold the “Unlock” and “Lock” buttons simultaneously until you hear the door locks engage and disengage again, indicating that you have successfully programmed your key fob. Re-insert the newly programmed key into the ignition in the “On” position to end the programming sequence.
Changing the battery has nothing to do with programming a battery. If the car was flat dead with a battery that lost all of the power because the dome light was on, then when jumped the vehicle will run fine. What may need programmed when the battery is replaced is the key fob.

Simultaneously hold down the “UNLOCK” button and the “PANIC” button and then release them at the same time. Now press the “UNLOCK” and “LOCK” buttons at the same time and then release them at the same time.