DTC codes / U02xx · Lost communication with a control module / U025B
U025B is a generic network communication code indicating that a primary control module has lost contact with a specific special-purpose control module, designated as Module C, over the vehicle's controller area network bus. The detecting module has stopped receiving the periodic status messages it expects from that module, so it flags the missing communication and may set other modules into a default or limited operating strategy.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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