NHTSA Complaint #11717190 — 2021 GMC YUKON

I own a 2021 GMC Yukon Denali XL with approximately 81,000 miles. On 4 separate occasions, after coming to a complete stop in traffic and then attempting to accelerate, the vehicle violently jerks and shifts itself into park. I am not pressing the brake when this occurs. I must manually shift the vehicle back into drive in order to continue moving. This happens so fast, that I am only able to see a red outlined box that intermittantly flashes on the dashboard but I cannot see what it says before it disappears. The incident feels as though the vehicle has been struck from behind due to the abrupt force. This has occurred more than once and creates a dangerous situation in traffic, particularly when vehicle are behind me. The vehicle has been taken to a GMC dealership, which has serviced the vehicle since 2021. The dealership reports they were unable to duplicate the condition after driving approximately 60 miles and therefore cannot perform a repair. This issue remains unresolved. Given that the vehicle is shifting into park while in motion or during acceleration, I believe presents a significant safety hazard.