NHTSA Complaint #11520265 — 2022 MERCEDES-BENZ SPRINTER 2500

When parked or stopped at elevation (above 9,000) feet, the throttle doesn’t work. The vehicle just rolls down the hill (if on one) or stays put if on a flat surface. This is dangerous because I could roll into someone, and if alone, I am stranded with a vehicle that doesn’t work. I have contacted Mercedes. The dealership won’t fix it because they won’t drive it to elevation to recreate the problem, and there is no error code. There are multiple other people with this issue online, and the dealer told me they’ve seen the problem multiple times but don’t know how to fix it because no error code pops up.