Code Definition

U2003 — Audio Compact Disk / Disk Jockey Unit is Not Responding

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

About U2003

U2003 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 U2003 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 by the Audio Control Module when it cannot establish or maintain communication with the CD or Disk Jockey unit over the infotainment network, which depending on the system may be a MOST fibre optic ring, a LIN bus, or a low speed CAN bus. The CD or Disk Jockey unit is the compact disc player or changer that provides disc audio to the system, and it exchanges handshake and status messages with the head unit. The code sets when those expected signals are not received within a predefined time. The occupant may notice that CD playback is unavailable or the system reports a disc ...

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