A cold key fob is an unhappy key fob
Here is an interesting one I haven't run into before with other brands.
My wife went for her morning run this morning with her keys in her pocket, when it was about 20 degrees Fahrenheit out. When she got back to her Pacifica, it would not unlock, either by using the button on the door or by the buttons on the remote (none of the buttons worked). She used the key insert from the fob to unlock the door, which of course set off the alarm. Once she was inside the van, she was able to start the van and drive home, by which time the remote was warm enough to operate. Assuming that the van would warn if the battery in the remote is low on power, she did not see any warning.
Without getting lost in terminology, it seems like the transmitter portion of the fob didn't like the cold, while the ignition interlock did recognize the chip in the fob to start the van? Which system controls the touch auto unlock, or allows the button on the handle to work?
Has anyone else encountered this? It would suck to be stuck out in the cold like this if you didn't know the cause.