What does code U0259 mean?

DTC codes / U02xx · Lost communication with a control module / U0259

U0259Lost Communication With Special Purpose Vehicle Control Module A

U0259 is a generic network communication code indicating that a primary control module has lost contact with a special purpose vehicle control module, designated as module A. The detecting computer has not received the expected periodic status messages from that module over the vehicle's communication bus for a calibrated period, so it sets this code and may illuminate the warning light.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaLost communication with a control module

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.