Mercedes-benz U11a600 _hot_ -

The Mercedes-Benz fault code translates to "Communication with control unit 'Radar sensorics' has a malfunction"

. This code typically appears when there is an interruption in the data flow between the radar sensors (used for safety systems) and other control modules, such as the steering or drivetrain units. National Highway Traffic Safety Administration (.gov) Quick Verdict: Can You Ignore It?

In many cases, yes. Mercedes-Benz issued a technical bulletin (LI46.35-P-069432) stating that for certain models like the B-Class (W247) B250e (2014-2017) , this code can be shown by mistake

in XENTRY Diagnostics. If your steering and safety systems are functioning normally and you only see this code during a scan, it can often be safely ignored as a software glitch. National Highway Traffic Safety Administration (.gov) 1. Potential Symptoms

If the code is legitimate (not a software ghost), you may notice: Warning Messages:

"Collision Prevention Assist Plus Inoperative" or "Active Lane Keeping Assist Inoperative" on the dashboard. Disabled Safety Features: mercedes-benz u11a600

Adaptive cruise control (DISTRONIC), blind spot monitoring, or emergency braking may stop working. Red Triangle:

The brake assist warning light (red triangle) might illuminate if the system cannot gauge the distance to the car ahead. Automotive Tech Info 2. Common Causes

If you are experiencing actual performance issues, the breakdown is usually:

“Collision prevention assist plus inoperative” warning in Mercedes

Title: Preliminary Technical Assessment: Mercedes-Benz Component U11A600 Intercooler end tanks (plastic welds fail) Throttle body

Date: October 26, 2023 Prepared For: Technical Procurement / Vehicle Maintenance Division Subject: Analysis of OEM Component U11A600

Step 2: Perform a Boost Leak Test

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

The Form and Function

Physically, the U11A600 is deceptively simple. Housed in a high-temperature, chemical-resistant thermoplastic, it measures no more than a few inches in length. One end features a two-pin electrical connector sealed with a Viton gasket; the other end is a precision-machined hydraulic spool or a plunger. Inside, a copper-wound coil surrounds a ferromagnetic core.

When the engine control unit detects a rough road surface or a hard cornering maneuver, it sends a pulse-width modulated signal to the U11A600. The coil energizes, creating a magnetic field that moves the plunger a fraction of a millimeter. This movement opens or closes a tiny hydraulic bleed orifice, which in turn adjusts the oil pressure in the shock absorber’s bypass circuit—or, in a transmission application, changes the clamping force of a clutch pack. The result is seamless: a suspension that instantly softens over a pothole or a gear change that occurs with imperceptible smoothness. The U11A600’s job is to be felt only by its absence; when it fails, the vehicle’s character degrades abruptly, producing harsh shifts or a bouncy, uncontrolled ride.

Frequently Asked Questions (FAQ)

Q: Is U11A600 the same as P0106? Not exactly. P0106 is the generic OBD2 code for manifold pressure plausibility. U11A600 is Mercedes-specific and often provides more detail (e.g., which sensor B28/7 is at fault). The Form and Function Physically, the U11A600 is

Q: Will disconnecting the battery reset U11A600? Temporarily, yes. But the code will return once the ECU runs its monitoring cycle (usually a few drive cycles). Disconnecting the battery is not a fix.

Q: How much does a dealer charge to fix U11A600? Diagnosis alone: $180–$250. Replacement of one sensor: $350–$550 total. If a boost leak is found, $800–$1,500. For ECU software: $200–$400.

Q: Can a bad MAP sensor cause U11A600 on an AMG? Absolutely. On the M177 (C63/E63), U11A600 is often linked to the bank 1 manifold pressure sensor. AMG engines have two sensors (one per bank). You must identify which bank logged the fault.

Q: I replaced the sensor and the code came back after 50 miles. Why? 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.

Q: Is U11A600 the same as U11A6?

A: No. U11A600 is the extended code. U11A6 (without the zeros) typically refers to a different bus fault. Always use the full 9-character code.

Step 4: Compare Sensor Resistance

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.