Code Definition

U2015 — Signal Link Fault (Non SCP)

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

About U2015

U2015 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 U2015 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 stored when a control module detects a fault on a communication signal link that operates outside the Standard Corporate Protocol, or SCP, such as a CAN, LIN, or MOST bus. It points to a loss of signal integrity on that link, seen as missing messages, invalid signal levels, or a disruption in the normal flow of messages between modules. The cause can be a wiring or connector fault on the link, electrical noise, or a module that is not driving the line correctly. Depending on which link and modules are affected, the driver may see warning lights, lost features, or default operation ...

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