NHTSA Complaint #11563046 — 2023 MERCEDES-BENZ SPRINTER 2500

At 3,000 miles, my 2023 Van (purchased new) developed significant reduction in power and acceleration. The transmission also shifts incorrectly (too late, resulting in higher then normal RPM's) and then abruptly downshifts upon stopping. When going uphill, the van obtains a max speed of about 35-40MPH, forcing me to travel on the local Interstates on the shoulder with my hazards flashing so other vehicles know to pass me. Van was left at Mercedes Dealership for 1 month. Van was not repaired, no plan or remedy was communicated. Van has only been inspected by the dealership where it was purchased. A check engine light came on about 1 week after van lost power.