Pretty sure that was added on.
I'm finding results tired to transfer case oil wear but nothing definitive. One YouTube video where the guy changed his TC fluid due to that exact error but never followed up in the comments if the error went away.
It feels like a related symptom error like trying to figure out a random cyl misfire actually from weak CPS.
The error is vague and seems to imply slip in the TC which is why the guy changed the fluid.
Are you like me heavy foot driver?