Cooling fan stuck on full speed '23 3.0

[superdashdad]

Anyone have issues with the fan being stuck on full speed with a newer 3.0 Duramax?   It was -5 so I plugged the truck in for a couple of hours, figured I would be nice to it and give it a warmer start.  I started it after unplugging and the engine cooling fan(s) ran full speed for a 3 hour drive to the ski mountains when the temp hovered around 0 degrees out.  The next day it was back to normal.  I found a tsb from '20 or '21 that said there is an update coming but the truck is a '23.  No codes were stored and no check engine light so probably no use taking it in to the dealer.

[jashaw]

My 2020 2.7 did the same when it was very cold out also. Not doing it anymore though. 

[Dpach]

There is a bulletin out on this. GM is working on an over the air update. GM is recommending not to plug in unless temps are below 0 F.

[superdashdad]

Thanks Dpach.  I'm sure they had a whole bunch of people with the same problem after the cold weather this past weekend.