2014 Sierra service 4wd

Gregb131 · November 24, 2021

Started getting service 4wd message. Dealer was able to squeeze me in quickly, but were unable to clear a code/do a relearn and didn’t have time to go any further. Mechanic mentioned a communication issue.
when I put the truck in neutral and attempt to put the truck in anything other then 2wd I can hear a click then I get a service stabilitrac message.
any insight or anything I can try before it goes back to the dealer. I am quite mechanically inclined.

Gregb131 · November 25, 2021

Anyone ? I’m going to check some grounds tomorrow. Confused as why I’m hearing a click when I take it out of 2hi to go into 4wd and then service stabilitrak comes up. But Then goes away when switched back to 2hi

JimCost2014 · November 25, 2021

22 hours ago, Gregb131 said:

Started getting service 4wd message. Dealer was able to squeeze me in quickly, but were unable to clear a code/do a relearn and didn’t have time to go any further. Mechanic mentioned a communication issue.
when I put the truck in neutral and attempt to put the truck in anything other then 2wd I can hear a click then I get a service stabilitrac message.
any insight or anything I can try before it goes back to the dealer. I am quite mechanically inclined.

Maybe something to do with this TSB:

MC-10113854-9999.pdf

Gregb131 · November 30, 2021

Anyone else have any ideas?

Gregb131 · December 20, 2021

DTC C0321 04: Transfer Case Lock Circuit Open

local garage was able to pull this code up but they weren’t able to clear it.

Anyone? It will be going to the dealer after Christmas. I’d just like to see if I can check anything

Supreme Pizza · December 20, 2021

I would start with checking the electrical connections on the encoder motor. Also make sure the encoder motor is not loose. Might want to check the grounds in that area as well. Maybe reset everything by disconnecting the battery for a while. Maybe double check the owners manual instructions, just in case something is getting overlooked while trying to change the transfer case settings. You could also put all 4 corners of the truck off thew ground, and try it that way, so that the wheels and drive system can move as needed when the gears line up. Uh... Maybe check the t-case fluid? Maybe check for burnt out fuses. Having the engine in neutral, with the RPM's up a bit and the headlights off, might send a little more power to the encoder motor.