Code Definition

U0442 — Invalid Data Received from PCM

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

About U0442

U0442 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 U0442 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

One or more receiving control modules monitor the data the Powertrain Control Module broadcasts over the CAN network, such as engine speed, coolant temperature, vehicle speed, and torque. DTC U0442 sets when a receiving module finds that the PCM messages are arriving but contain invalid, implausible, or out of range values that do not match the expected parameters for the current conditions. This is a data integrity or plausibility fault rather than a complete loss of communication, so the PCM is talking but its information cannot be reliably used by other systems. Causes range from a PCM soft...

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