Door Unlock Issues

[andyhaug]

I have my truck setup to unlock all doors when I put it in park, but unlock only the drivers door with the key fob. I have yet to have issues with the fob, but every once in a while it fails to unlock all doors when placing it in park. I think it unlocks the drivers door because I do not have to pull the handle twice, but it does not unlock the other 3 doors. I had it happen today, left the key in the ignition and went to get something out of the back seat on the passenger side only to find the door locked. I have also had it happen when picking someone up, parked and did not turn the truck off but the passenger door was still locked. I have experienced this turning the truck off and taking the keys in the garage. Can't figure it out, has nothing to do with the key being in the ignition. Asked the dealer about it and got the standard cannot duplicate customer concern answer. Anyone have any ideas?