Code Definition

U0126 — Lost Communication with Steering Position Sensor

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

About U0126

U0126 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.

When U0126 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 U0126 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 steering wheel position sensor, also called the steering angle sensor, broadcasts steering angle and turn rate to the ABS, electronic stability control, and electric power steering modules over the Controller Area Network (CAN) bus. DTC U0126 sets when a receiving module stops seeing the expected CAN messages from this sensor for longer than the calibrated time out, so it declares the sensor lost rather than reading a wrong value. This is a communication fault, meaning the problem lies in the sensor power, the sensor itself, or the CAN wiring and connectors between it and the rest of the n...

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