Code Definition

U2012 — Communication Bus Error (Non SCP)

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

About U2012

U2012 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.

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 U2012 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

This DTC is set when a module detects a general fault condition on a communication bus that does not use the Standard Corporate Protocol, or SCP, typically a CAN, LIN, or MOST network. Rather than pointing at one missing module, it flags a bus level problem such as signal distortion, bus contention, electrical faults, or invalid bus states that prevent reliable transmission or reception. The condition may be caused by wiring faults, termination problems, or a single module disturbing the whole bus. Because the fault affects the shared network, the driver may see multiple warning lights and sev...

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