2021 2500hd trans problem?

[Daler442]

New to the site, have a 2021 2500hd  with 6.6 gas. Yesterday was turning around in my driveway and heard a bang, then check engine light,  trac light,  reduced engine power,  service parking brake  lights all came on. I can run through the gear shift, but it won't engage any gears. When I have it in r or d if I touch the gas it revs up and speedo keeps going up. Looked at shift linkage and it does move, so I'm guessing a serious internal trans issue?? Anyone else have an issue like this? Thank you , 

Update, just pulled code p215b , output shaft speed correlation 

Edited March 13, 2022 by Daler442

[sheath]

Sounds like a transfer case issue.  May have somehow become engaged in 4wd before or during the turning maneuver.

[Daler442]

It was in 4wd already,  had been for 30 to 40 minutes.  Wasn't horsing it. I let it shift to drive, was taking it easy. Just don't get it

[sheath]

Sounds like it will need to go to the dealer.   I'd discuss the details with your service advisor.  She/He may be able to shed more light on the issue.

[Another JR]

I agree. Sounds like you broke something in the 4wd system rather than the transmission due to making repeated tight turns in 4wd in a high tire traction condition. Unfortunately it’s not really built for that.