Having the issue with the service message coming up in snow storms (WI) on my 2019 chevy 1500, they did a relearn on the transfer case and it didn't fix the issue. The dealer said they've had replacing the tccm fix it, but the most common issue is snow and ice building up around the sensor housing and once it heats up around the trans and transfer case, the ice melts with debris and trips the sensor. So, they've cleaned and resealed a few housings and that fixed their issues on a few. We'll see if that's what they do for me this time with mine, it's the second appointment I've had and I've made sure to take pictures of each instance of the code going off, so they can't tell me there's nothing wrong.