Have you tried this:

1. Get in the truck with the doors closed.
2. Hold down the unlock button on the door.
3. Turn the key from on to off 3 times without cranking the motor or until the horn sounds and the locks cycle.
4. After the locks cycle then release the unlock button.
5. Hold the lock AND unlock button down on the remote until the lock cycle, this should not take longer than 30-45 seconds.
6. Once all remotes are programmed turn the key on and the programming mode will end.