Hi John
We had the same thing, on our '16 Yeti. I ran an obd check and got 'rear door lock implausible signal' and 'rear door lock leak to earth'
Ours would make clunks if you tried to get it to lock, its only locked once or twice in the last month (lots of parking it close to walls / lampposts / pillars has been necessary) and so my 1st port of call was the lock / latch unit.
I ordered a replacement from a breaker and set about removing the door card, some pulling, some torx screws / bolts (You have to use a surprising amount of force in places, there's a vid on YT which I thought was excessively violent. Turns out it isn't)
Once the card was off disconnect the tweeter cable, and I opened / cut the foam panel by the lock, removed the cable and the torx screw by it, then it was a case of removing the 2 triple square headed set screws from the lock itself, (check you've a tool whick fits these before you start, a TORX won't cut it) removing the mechanical cable connections and then swapping the unit over. You can test the new unit by connecting it to power, closing the latch with a screwdriver and locking / unlocking on the remote.
Refitting, as the Haynes manual says, is there reverse of removal, take photos if you're nervous.