In the same boat as everyone here. 2021 GMC Sierra 3.0 with 2000 miles. They are replacing the exciter and I’m expecting it back early next week after being in the shop for OVER 30 days due to parts shortage. I’ll update any new info I get. Thankfully it’s a lease but I was going to buy it out since it’s my perfect truck (just broke). Not feeling good after reading the thread though.