Log into WIS/ASRA or consult a dealer. Several TSBs (e.g., P-07.19-70 or LI07.10-P-072849) address U11A600 with a simple PCM software update. Always check your VIN for applicable updates before replacing hardware.
What makes the Mercedes-Benz U11A600 a compelling subject is its anonymity. There are no YouTube videos titled “AMAZING U11A600 UPGRADE!” There are no aftermarket performance variants. It is purely functional. Yet, without it, a $70,000 luxury sedan would ride like a 1980s taxi or shift gears with the brutality of a novice stick-shift driver.
This component embodies the German Ingenieurwissenschaft (engineering science) approach: design every part not for flash, but for a specific, calculable duty cycle. The U11A600 is over-engineered—its plastic is glass-fiber reinforced where it doesn’t need to be; its coil is encapsulated in a way that seems excessive. But that over-engineering is what allows a Mercedes to feel "tight" at 150,000 miles. The U11A600 is a silent contract between Mercedes-Benz and the owner: We will make this tiny piece of electronics and metal so robust that you will forget it exists.
To understand the severity of U11A600, you first need to understand how Mercedes-Benz structures its Diagnostic Trouble Codes (DTCs).
In simpler terms: Your Mercedes-Benz has dozens of computers (ECU, TCU, SAM, ESP, AAC). The gateway is the internet router. Code U11A600 means the router has stopped receiving regular "heartbeat" signals from one of its connected devices, or the data received is corrupted.
The Mercedes-Benz U11A600 code is a warning sign that your engine’s air management system is compromised. While it sounds intimidating, the diagnostic path is straightforward: check live data, test for boost leaks, inspect the sensor, and update the ECU software.
For most owners, replacing the intake manifold pressure sensor and clearing the code resolves the issue permanently. However, if you have a 2012–2017 M276 or M278 engine, always start with a dealer software update—it has saved countless owners from unnecessary sensor replacements.
If you are not comfortable with DIY diagnostics, take your Mercedes to an independent German car specialist. Show them this article. A competent technician with a Mercedes scanner will have U11A600 diagnosed in 20 minutes and your car back on the road, running smoothly, before lunch.
Remember: The “600” means the fault is current. The longer you wait, the higher the risk of collateral damage. Address U11A600 today, and your Mercedes will reward you with the silky boost and responsive throttle you expect from the Three-Pointed Star. mercedes-benz u11a600
Need help finding the right pressure sensor for your Mercedes VIN? Use the OEM part number lookup in the comments or visit your local Mercedes parts counter with the last 8 digits of your VIN.
The code U11A600 is a specific diagnostic trouble code (DTC) often encountered in modern Mercedes-Benz vehicles, particularly those built on the MFA2 platform (such as the A-Class W177, CLA C118, and GLB X247).
Below is an article detailing the nature of this code, why it appears, and how to handle it.
Understanding Mercedes-Benz Fault Code U11A600: A Guide for Owners and Technicians
If you have recently scanned your Mercedes-Benz using a XENTRY diagnostic tool and found the fault code U11A600, you might be concerned about the safety of your steering or radar systems. However, this particular code is unique in the world of automotive diagnostics because it is often classified as a "phantom" or "mistake" code by the manufacturer. What Does the U11A600 Code Mean? The official diagnostic text for U11A600 is:
"Communication with the 'radar sensor system' control unit has a malfunction."
This code is typically stored in the N68 - Electrical Power Steering (ES) 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
This code is most prevalent in newer Mercedes-Benz compact models equipped with specific safety packages (such as SA code 243 for Lane Keeping Assist): A-Class (W177) CLA (C118) GLA (H247) GLB (X247) The Manufacturer’s Verdict: "Shown by Mistake" Log into WIS/ASRA or consult a dealer
According to official Mercedes-Benz technical service bulletins (e.g., LI46.35-P-069432), fault code U11A600 is frequently a false positive triggered by the XENTRY Diagnostics software itself. Key Takeaways from Mercedes-Benz Technical Guidance:
Ignore the Code: If there are no active dashboard warning lights (like a steering wheel icon or "Radar Sensors Dirty") and the vehicle is driving normally, the code can be safely ignored.
No Functional Restriction: The steering functions and safety systems typically continue to operate without any actual restrictions, even when this code is present in the "stored" memory.
Software Bug: The code is often the result of a communication timing error in the diagnostic software rather than a hardware failure in the radar sensors or steering rack. When Should You Be Concerned?
While U11A600 is often a "ghost" code, you should seek professional service if it is accompanied by other symptoms:
Dashboard Messages: If you see "Active Brake Assist Inoperative" or "Blind Spot Assist Inoperative" on your instrument cluster.
Physical Symptoms: If the steering feels unusually heavy or if the adaptive cruise control refuses to engage.
Sensor Obstruction: Radar sensors (located behind the Mercedes star in the grille or behind the bumpers) can malfunction if they are covered in heavy mud, ice, or thick road grime. Summary for Technicians In simpler terms: Your Mercedes-Benz has dozens of
When performing a short test and finding U11A600 in the N68 control unit, check for related "Current" (Active) faults. If U11A600 is only "Stored" and there are no actual customer complaints regarding steering or radar performance, Mercedes-Benz recommends clearing the code and proceeding without replacing any hardware. Fault code U11A600 stored steering control unit - nhtsa
Due to the discrepancy in standard nomenclature, the following classification has been established:
Technical Context: During the mid-2000s to early 2010s, Mercedes-Benz utilized Siemens VDO as a primary supplier for interior electronics. Components manufactured by Siemens VDO often bore part numbers starting with "U11..." printed directly on the circuit board or the manufacturer's label. The Mercedes OE number would be printed on a separate sticker adhered to the unit.
Hypothetical Match: Components matching the U11A... series are frequently found inside:
Recommendation: To verify the exact Mercedes OE number, the physical label on the unit must be inspected. Look for a 10-digit number beginning with A (e.g., A204... or A211...).
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.
You do not need a dealership-level scan tool, but you do need a professional-grade Mercedes scanner (like XENTRY, iCarsoft MB V2.0, Autel MaxiSys, or ThinkDiag). Generic OBD2 readers will show only P0106 (Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance).