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2025 GMC Sierra Denali Ultimate No Super cruise or OnStar
This is my 8th GMC Sierra. I have a had excellent service out of these trucks until recently. I Bought a brand new 2023 Sierra Ultimate that is used for pleasurer now and my yearly commute to Florid...
After 5 or 6 service appointments for the same issue (started in August 2025 with only a couple hundred miles) the dealership provided this information: It is a known issue. GM does not have a repair or correction as of January 9, 2026. There is a Service Bulletin, Preliminary Information - Technical. PIT6455. If there is a resolution, PIT6455 will become a TSB with instructions for the “fix”.