Has anyone had this recurring P026C check engine code resolved yet? Have a 2021 GMC Sierra 3500 Dmax as well that was purchased out of state due to no inventory in CA...threw a code on the way home to CA and now it can't be registered in CA due to smog requirement. Spent $80k + on a truck that can't be registered. I have GM case number assigned but getting ahold of anyone at GM is nigh to impossible.