Code Definition

U2139 — CAN Bus No Communication With Column Integration Module

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

About U2139

U2139 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for Holden vehicles. 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 U2139 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 Column Integration Module (CIM) sits on the vehicle network and manages steering column functions such as the multifunction stalk switches, turn signals, wipers, horn, and steering angle input, sharing this data with other modules over the CAN bus. DTC U2139 is set when a receiving module stops receiving valid CAN messages from the CIM within a calibrated time window while the rest of the network is still communicating. The fault usually means the CIM has gone offline due to loss of power or ground, a break or short in its CAN circuit, or an internal module failure. The driver may notice i...

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