The Mercedes-Benz fault code specifically refers to a "Communication with the 'radar sensor system' control unit has a malfunction". While seeing a "malfunction" code on a diagnostic scanner like XENTRY can be alarming, this particular code often has a unique and surprisingly simple resolution. What is Fault Code U11A600?
– Cruise control will refuse to engage.
The U11A600 code is often associated with issues such as:
: The error can be triggered by a faulty sensor, damaged wiring, a blown fuse, or even temporary obstructions like heavy mud or ice blocking the sensor's "view". mercedes-benz u11a600
: Primarily affects Model 247 (B-Class/GLB) equipped with SA code 243 (Active Lane Keeping Assist).
Remove the radar sensor from the rear bumper (or front, depending on which system is reporting the error). Inspect for water damage or corrosion on the pins.
Weakened electrical connections due to rust or corrosion can interrupt the CAN bus communication signal. The Mercedes-Benz fault code specifically refers to a
Specifically, this code appears when the primary detects that it cannot reliably communicate with one or more radar sensor modules. The radar sensors are critical for the functionality of several safety and convenience features.
: Dirt, mud, or ice covering the radar sensors located behind the bumpers.
Using a multimeter, measure resistance between signal ground and signal output. A healthy sensor should show varying resistance (2–10 kOhms) as you apply vacuum/boost with a hand pump. No change = dead sensor. – Cruise control will refuse to engage
Before initiating hardware teardowns, technicians must cross-reference official documentation. According to the official National Highway Traffic Safety Administration (NHTSA) database, Mercedes-Benz issued technical service bulletin specifically covering this code.
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