2023 Mercedes-Benz Sprinter 3500 Vehicle speed control Problems

“Vehicle suddenly lost ability to accelerate. After driving narrow mountain roads with a lot of downshifting and upshifting, vehicle was on a long, gradual downgrade, then approached a long, slight (4%?) upgrade. Vehicle would not maintain speed and began to decelerate. Pushing the accelerator to the floor did nothing. Attempted to manually shift gears, but transmission would not downshift, or upshift. This almost resulted in being rear-ended by a semi. The speed limit was 55 and vehicle had decelerated to ~25 mph by the time I found a place to pull over. …”

“Emergency brake assist, distance sensing and adaptive cruise control randomly and intermittently deactivate while driving. In a recent 8-hour highway trip this deactivation occurred 7 times, sometimes correcting itself with no driver intervention, and other times remaining disabled for hours and hundreds of driving miles. Durning motor off and restarting occasionally reset the issue, but many times it did not. When these systems disable, the van’s speed rapidly decreases and may cause other vehicles to hit the rear of the van, or cause van drivers to panic and/or lose control of the vehicle. …”