2022 GMC Sierra 3500HD ... 110 miles on it (had it for two weeks). Noticed after I towed trailer from RV dealership (~5mi) to home, disconnected, let truck sit overnight, next morning Service 4wd light + Service ESC + Parking brake setting every time I shift into park. Freaked out, did forum search and didn't turn up this topic. Next day took RV to storage unit (spent 2 hours trying to squeeze into spot ... 90 degree back with a post on one side and 108" fifth wheel on other side ... getting a new storage unit, but that is a problem for another day). After doing that for two hours I noticed the service 4wd light/service esc + parking brake issue was resolved. Yay! Take truck home, let it sit for two days. Got into it tonight to run to town and service 4wd + Service ESC + Parking Brake issue. Roads have been wet here, but no snow. Took it to dealer and they pulled codes, tons of transfer case communication errors. Will share this topic with them in the hope it helps their techs.
Anyone else here been able to get it fixed long term? What was it?
Summarizing what I have read so far in the thread:
Works
TCM/TCCM (Transfer Case Module) Replacement (One broke again after this)
Transfer Case Range Position Sensor Replacement (1x confirmed?)
Output Shaft Bearing Snap Ring Popped Off -> Replace bearing snap ring
Does Not Work
Range actuator re-learn
Reprogram TCCM
Threatening to get a Ford/Dodge/Tundra
Edit: Looks like there are more reports of this:
https://www.duramaxforum.com/threads/abs-light-e-brake-light-and-service-4wd.960009/