Code Definition

U0230 (87) — Lost Communication With Rear Gate Module

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

About U0230

U0230 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 U0230 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 exchange information over the Controller Area Network (CAN). DTC U0230 is logged when one or more modules do not receive the expected CAN messages from the Rear Gate Module within a calibrated time threshold. A failure type byte of 87 reported with the code indicates a missing or invalid message, signifying that the rear gate module has stopped communicating on the network rather than sending bad data. This typically results from loss of power or ground to the rear gate module, a CAN bus circuit fault, or an internal module failure. The rear gate module manages powe...

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