: According to Mercedes-Benz technical bulletins , this code is frequently logged by mistake in the steering control unit (N68) during XENTRY diagnostics.
If the code is legitimate (not a software ghost), you may notice: Warning Messages:
Check for any cracks or dents in the front bumper that might indicate the sensor has been knocked out of place.
: Locate the radar sensor behind the front grill or bumper. Unplug the harness connector and check for signs of corrosion. If green buildup is found, clean the pins using electronic contact cleaner, apply dielectric grease, and re-seat the plug. If water has penetrated the interior of the sensor housing, the entire radar unit must be replaced and SCN-coded to the vehicle. 📊 Summary of Diagnostic Actions System Status Recommended Action Scanned via XENTRY / No Dash Lights All driver assists work normally. Ignore the code. It is a known software reporting bug. Dash Lights On / Clean Bumper Cruise and Brake assist disabled. mercedes-benz u11a600
: "Communication with the 'radar sensor system' control unit has a malfunction".
This code is typically stored in the control unit. On the surface, it suggests that the steering system is having trouble talking to the vehicle's radar, which is critical for safety features like Active Brake Assist or Distronic Plus adaptive cruise control. Common Affected Models
The U11A600 fault code in your Mercedes-Benz is a specific alert indicating your vehicle's brain (PTCU) has lost contact with its eyes (radar sensors). While the symptoms can be alarming, the issue is often solvable, sometimes as simply as a software update. However, in other cases, it may require component replacement. : According to Mercedes-Benz technical bulletins , this
Modern Mercedes-Benz passenger vehicles rely heavily on an interconnected network of modules that share data over Controller Area Network (CAN) bus lines.
"Adaptive Cruise Control Inoperative," "Active Brake Assist Functions Limited," or "Pre-Safe Functions Limited."
: The front radar is highly sensitive. If the front bumper takes a minor hit (even from parking), or if the sensor bracket bends by more than 3 degrees, the module shuts down communication. Heavy mud, ice, or thick, non-factory metallic paint over the bumper emblem can also block the signal. Unplug the harness connector and check for signs
If steering functions normally and no Advanced Driver Assistance Systems are actively failing on the road, the fault code can be safely ignored , as it does not impose any operational restrictions on the vehicle.
The most common culprit is the Active Brake Assist system's control unit and radar sensor assembly, designated as component . This unit, often supplied by Continental, integrates the radar sensor and its processing logic. An internal electrical failure within the A108 unit itself can cause it to stop communicating or to draw abnormal electrical current, triggering the fault.