Code Definition

U0433 — Invalid Data Received from Front Distance Range Sensor

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

About U0433

U0433 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 U0433 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and 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 U0433 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 receiving control module, commonly the ADAS or driver assistance module, the ABS and stability module, or the PCM, monitors the data sent over the CAN network by the front distance range sensor. This sensor, usually a radar unit behind the front grille or bumper, measures the distance and closing speed to vehicles ahead for adaptive cruise control, forward collision warning, and autonomous emergency braking. DTC U0433 sets when the receiving module finds the sensor data present but implausible, corrupted, or outside the expected range for current conditions. This is a data validity or plau...

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