Code Definition

U2143 — Lost Communication With Steering Angle Sensor

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

About U2143

U2143 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.

When U2143 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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 U2143 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

Modules on the high speed CAN bus rely on steering angle data to support electronic stability control, traction control, and variable effort power steering. DTC U2143 is set when a receiving module stops receiving valid CAN messages from the steering angle sensor within a calibrated time window while the rest of the network is still communicating. The fault usually means the steering angle sensor has gone offline due to loss of power or ground, a break or short in its CAN circuit, or an internal failure of the sensor module. When this code is active the driver typically sees the stability cont...

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