Mercedes-benz U11a600 ((free)) ✮

Generic OBD2 scanners often misinterpret U-codes. You need XENTRY, iCarsoft MB II, or Autel MaxiSys. Look for additional U-codes (e.g., U116800, U010000). They tell you which module is missing.

The code is shown completely by mistake when reading out data through the XENTRY Diagnostics tool .

Three possibilities: 1) You have an intermittent boost leak that only appears under heat expansion. 2) The wiring harness has high resistance (pin fitment issue). 3) You need the dealer software update.

Pressurize the intake system to 5–10 PSI and listen for hissing. Pay special attention to: mercedes-benz u11a600

Any help appreciated. Thanks!

According to a Mercedes-Benz Technical Service Bulletin (LI54.71-P-077857), the U11A600 code can also be triggered by a brief interruption in the power supply to the radar sensor (B92/12) or the A108 control unit. This could be caused by a momentary voltage drop, a loose connection, or a failing battery. In fact, a 2021 GLA 250 owner reported that after replacing a faulty 12V starter battery, they were able to resolve some of the multiple error codes the car was displaying. A weak or failing battery is a known cause of numerous seemingly random electronic communication faults in modern vehicles.

: This code is frequently seen on Model 247 (B-Class / GLB) vehicles equipped with the SA code 243 (Active Lane Keeping Assist). Generic OBD2 scanners often misinterpret U-codes

: Often found stored in the Steering Control Unit (N68) or the Drivetrain Control Unit (PTCU) .

Resolving code U11A600 requires a systematic approach. The issue usually falls into one of three categories: software bugs, physical alignment issues, or electrical damage. 1. The XENTRY Software Bug (The "Ghost Code")

Because radar sensors are exposed to elements in the lower front bumper or rear bumper corners, they are highly susceptible to moisture damage. Water can breach the sensor housing seam or sneak into the electrical connector plugs, corroding the data pins and shorting out CAN communication. 3. Battery and Voltage Fluctuations They tell you which module is missing

XENTRY Diagnostics (the proprietary Mercedes factory diagnostic tool) defines U11A600 as: “Communication with the 'radar sensor system' control unit has a malfunction.”

Modern Mercedes-Benz vehicles are incredibly sensitive to voltage. The CAN bus requires a stable 9–15 volts to function. When the auxiliary battery (or main AGM battery) drops below 11.8V during start-up, the gateway module fails to boot properly.