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Corroded engine-to-chassis ground straps create electrical noise that mimics a bus fault.
Mercedes-Benz electronics are highly sensitive. A failing 12V battery can cause "U" (Communication) codes across multiple modules. Professional Repair Expectations mercedes-benz u11a600
Understanding Mercedes-Benz Fault Code U11A600: A Guide for Owners and Technicians mercedes-benz u11a600
If corrosion is found at the sensor connector or a broken wire halfway through the harness, expect 1–2 hours of electrical diagnosis plus repinning or section replacement. mercedes-benz u11a600
: In many cases, the manufacturer suggests the code can be ignored as it does not restrict steering functions or system safety.