CARWATCH
U0100 Error on Mercedes-Benz
What it means and how to fix it
🚨 Fault Description (U0100)
The DTC code U0100 in a Mercedes-Benz vehicle is a sign that the onboard computer has registered the following anomaly:
"Lost Communication With ECM/PCM 'A'"
Although this is a standardized OBD2 code, the symptoms and the location of the faulty sensor can vary depending on the exact model of your Mercedes-Benz (year, engine type, etc).
Other frequent faults detected in Mercedes-Benz:
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To clear the engine light and read the U0100 code from your phone, you need an OBD2 adapter compatible with the Mercedes-Benz ECU.
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