2021 MERCEDES-BENZ SPRINTER 2500 Forward Collision Avoidance Warnings Problems

Brakes deployed and distance warning illuminated for a very brief instant at highway speed (70 mph) just when a vehicle traveling faster starts to overtake. Very scary! Luck to not have been hit on the right rear corner.

The ABS front wheel sensor became inoperable after 27K. This disables several onboard systems that assist in vehicle control, including blind spot detection, and collision warning systems. Looking at the sensor - it completely separated at the connector by the wheel hub. The surrounding area showed no signs of unusual trauma or deterioration.

Our Sprinter 2500 is equipped with Mercedes Benz autonomous cruise (Distronic Cruise). It fails repeatedly for unknown reason, and when it does it also disabled related safety features (collision warning, emergency braking) as well as standard cruise control. The manual suggests checking for bugs, snow, or other obstructions on sensors, but they’ve been clear. Forums note that their vans also cut out, theorizing that it happens because there aren’t any vehicles in front of the van for prolonged periods of time and the software thinks there is an error. They also note that Mercedes had not been helpful. The fact 1) it happens for unknown reasons, and 2) it disables essential safety systems is concerning and unacceptable.

Entire brake system (distance warning, active brake assist) malfunctions frequently without conditions that warrant. Brakes and steering impeded and distracts and startles driver. Problem confirmed by dealer without remedy. Dealer states no malfunction in system. Taken vehicle to dealer on four separate occasions. Dealer recalibrated and reset and called tech support at manufacturer and manufacturer said that is the way it is supposed to operate. The problems persist on every trip we take. Warning indicators began within 50 miles of my picking up the vehicle brand new from the dealer. System disables then resets itself at random times during driving. Dealership states they have no codes indicating fault in system.