Code Definition

U0231 (00) — Lost Communication With Rain Sensing Module

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

About U0231

U0231 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 U0231 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 control modules communicate over the Controller Area Network (CAN) to share sensor and status information. DTC U0231 sets when one or more modules do not receive the expected CAN messages from the Rain Sensing Module within a calibrated time period. A failure type byte of 00 indicates a general communication failure with no additional signal qualifier. This occurs when the rain sensing module is offline due to loss of power or ground, a CAN circuit fault, or an internal module failure. The rain sensing module sits at the top of the windshield behind the mirror and signals the wiper system ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts