Code Definition

U0103 — Lost Communication With Electric Gear Shift Module

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

About U0103

U0103 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 U0103 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 Electric Gear Shift Module manages gear selection on a shift by wire transmission and shares its status with the Powertrain Control Module and Body Control Module over the CAN data network. DTC U0103 is a generic network code set when a receiving module stops receiving valid CAN messages from the Electric Gear Shift Module for a calibrated period while the ignition is on and the rest of the network is communicating. The fault usually means the gear shift module has gone offline due to loss of power or ground, a CAN wiring fault, or an internal module failure. When this code is active the d...

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