Code Definition

U0263 (00-28) — Lost Communication with Speech Recognition Module

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

About U0263

U0263 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 U0263 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

The Body Control Module, Audio Control Module, or central gateway monitors CAN communication with the Speech Recognition Module to confirm valid data exchange. The Speech Recognition Module processes spoken commands for functions such as voice dialling, navigation entry, and audio control. DTC U0263 sets when the receiving module does not get the expected messages from the Speech Recognition Module for a calibrated period while the network is active. This indicates a loss of network communication caused by a power, ground, wiring, or internal module fault rather than a functional speech recogn...

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