Code Definition

U0466 (20) — Received Invalid Data From Rear HVAC Control Module

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

About U0466

U0466 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 U0466 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 vehicle control modules communicate over the Controller Area Network (CAN) to exchange climate control commands and status information. DTC U0466 sets when one or more modules receive CAN messages from the Rear HVAC Control Module that are invalid or outside expected parameters. A failure type byte of 20 indicates a signal range or performance fault, meaning the information received does not correlate with expected rear climate operating conditions. This is typically caused by internal module faults, an unstable power or ground supply, or CAN integrity issues affecting the rear HVAC module...

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