HomeAll RepliesReply To: 2024 Sierra 6.2L Problems Reply To: 2024 Sierra 6.2L Problems Sponsored November 27, 2023 at 8:33 am #790127 SGarciaParticipant I believe it has something to do with programing of cylinder deactivation and fuel management system. GM should deactivate it completely! It’s harmful to the engine! Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored