Welcome to forum.

You could try changing battery in fob, then if that doesn't work try to resync.

To synchronize, aim the transmitter eye at the vehicle and briefly
press either the Lock or the Unlock button twice. Within
approximately 30 seconds, insert the key in the ignition
and turn it to the ON/RUN position (just the position no need to start)

I was still having a issue so I unhooked battery, sat 15 min then rehooked car battery, then it worked.

Nothing worse than being 3.5 hours away from home in a hotel parking lot with a car acting up