NHTSA Complaint #11549365 — 2020 MERCEDES-BENZ SPRINTER 2500

After starting engine and putting transmission into drive, vehicle does not respond to throttle and will not move forward. If I put the transmission into neutral or park, the engine will respond to throttle input. Vehicle may respond to throttle when in reverse. This is an intermittent problem that seems to occur at higher altitudes than our home base of near sea level. The issue has occurred at 4,000 to 12,000 feet elevations. Sometimes the check engine light has come on during these events, but the check engine light clears by the time returning home. When taking the vehicle to Mercedes Van Service to have it checked, no diagnostics data can be found and they cannot reproduce the issue. This issue has occurred numerous times has has been to the Mercedes Van Service Center 4 or 5 times already for the issue. The last event occurred on 10/10/2023. The vehicle eventually behaves normally after several start attempts but makes it very difficult and potentially hazardous when attempting to leave remote campsites. When issue occurs, you don’t know when it will decide to behave normally or if you’ll need to call for emergency assistance via our Garmin satellite handheld unit because of being in a no cellphone service area.