Beeping while engine off

sounds like a faulty door lock actuator,see if you can tell which door is locking/and unlocking on it's own.

It’s the drivers side. How would I fix this?

Replace the latch assy.

I’m having the same problem with my 2013 Santa Fe.

Your car battery is on it's way out. Circuitry is telling you there is not enough amperage in your battery:-)

I was in a car accident last night and now When I lock my door with the remote the light flash to tell the car is lock but not beep sound to really tell me the car is lock ... can any thing happen after someone hit you on the back passenger side in the back end