The front passenger door does not unlock with either the key or the keyless remote. All other doors unlock. If driver's side door is open and I hit the unlock button on driver's side door, the locks start to lock and unlock about 3 times. Do I need to reprogram my keyless remote or is this a more serious issue that needs to be handled by mechanic?
Check the passenger door lock actuator. It is stuck in the locked position and when button is hit to unlock, the doors would lock again because the passenger door switch is sending the signal to lock the doors.