My keyless entry remote was working and all of a

First check the fuses and relays .Clean the door contacts to body .

does your unlock button work in car? If it does, do you have another keyless entry key fob? If so does it work? If you just replaced the battery you can try removing battery and cleaning contacts within remote. I know some of the nissan altimas had the same issue and the only solution was a new key fob. Good Luck

You will need to contact your local Ford dealer for a quote because prices may vary from region to region and dealer to dealer.

The keyless entry may be the control or thee module may have gone bad,the digtal display is a coomon problem the board goes bad and some connections on the display board are bad you will need to replace the cluster to solve this problem.

Check your owners manual there maybe a proceedure to reset the feature.

Also try disconnecting and reconnecting the battery.

dealer reflash

There is a technical service bulletin out on this probelm on 2004/2005 F150.
ISSUE: Some 2004-2005 F-150 vehicles built through 2/7/2005, may exhibit an inoperative keyless entry keypad. This may be due to the vehicle security module (VSM) not being configured to accept keyless entry keypad input.

The fix is to reprogam the vehicle security module with as-built data. So it would have to go to the dealer to do this.
The tsb number is 05-5-5.

the remote takes 2 pushes of the unlock button to unlock all doors.

Lock all the doors from the inside (with all the doors closed), unlock your driver's door by manually lifting the lock, then press it back down after you are out - this will prevent the alarm from sounding when you use the key to unlock the door.