Apparently this is another issue that GM will stick their head in the sand and hope nobody notices that all of these issues are VERY similar! Just like the poor quality lifters they put in their 6.2, 6.0, and 5.3 but GM wouldn't honor covering the fix when it was a known problem! I spent over $5,000 on my 2015 Sierra 1500 with the 6.2 to put better quality lifters in that GM should have used to build their engines in the first place. Now, I apparently made the same mistake purchasing a brand new 2025 GMC Sierra 2500HD AT4 that has 180 miles on it and I TOO am getting the Service 4WD message and the parking brake auto sets! The weather has been very nice and I have YET to even try to switch out of 2WD. So explain to me GM why this issue is happening! COME ON GM!!! Do better! These issues are UNACCEPTABLE! We do not have the time to constantly bring our vehicles to the dealer because your Quality Control/Quality Assurance, and company standards obviously suck. Good thing Toyota doesn't make a 3/4 ton or GM trucks would be put out of business! I believe a strong civil suit sits just within this thread alone and I'd bet this is just the handful of people who searched the issue out for themselves! A good law firm will have a heyday with this.
