Code Definition

U0072 — Vehicle communication bus E negative shorted to bus E positive

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About U0072

U0072 is a generic (obd-ii standard) network communication diagnostic trouble code. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

When U0072 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U0072 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC U0072 is a network communication code set when a control module detects that the Bus E negative and Bus E positive circuits are shorted together. Bus E is usually a dedicated LIN or secondary CAN network that relies on a voltage difference between its two lines to carry data. When the two lines are bridged, the differential signal collapses toward a single voltage and valid messages can no longer be transmitted, causing partial or total communication loss on that network. The driver may see multiple warning lights, inoperative convenience or safety features, and the scan tool may report se...

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