I’ve written a general post that covers all possibilities.
Safely remove the front grill or lower bumper valence to access the physical radar bracket assembly. mercedes-benz u11a600
In modern Mercedes-Benz vehicles, safety features like Active Distance Assist (DISTRONIC), Active Brake Assist, and Collision Prevention Assist rely heavily on radar sensors mounted behind the front bumper or grill. These sensors continuously stream data over the vehicle’s Controller Area Network (CAN bus) to processing units like the Electronic Stability Program (ESP) or the Electrical Power Steering (N68) control unit. I’ve written a general post that covers all possibilities
Radar signals need to travel unhindered. A layer of thick mud, heavy ice build-up, or dead bugs directly over the sensor emblem can mirror or muffle radar signals. Furthermore, if the front bumper or grill emblem was recently repainted using an incorrect clear coat or a metallic-heavy automotive paint layer, it will block or severely attenuate the radar pulses, registering a module communication failure. 4. Non-Standard Tire Sizes These sensors continuously stream data over the vehicle’s
on your dashboard, like "Assist Systems Inoperative," or is this code just showing up during a Fault code U11A600 stored steering control unit - nhtsa 19 Feb 2019 —
: Moisture can creep past the weather seals of the radar wiring connector. Over time, this creates green corrosion on the electrical pins, shorting out the CAN bus communication lines.
Mercedes-Benz released a technical service bulletin () stating that this code can be shown "by mistake" when using XENTRY Diagnostics.