My 2021 Denali 6.2 4 x 4 (13,500 miles)was in the shop for 4 weeks earlier in the year waiting on a fuel pump module. Now it is the shop again for a minimum of 10 days because the cylinder deactivation systlem failed. It is getting new lifters and a head gasket which interesting enough is on back order. I am getting fed up with it. If it did not have an expensive package aboard to allow it to be towed behind my motor home I woud dump it. Has anyone else had this problem?