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DTC codes / U02xx · Lost communication with a control module / U029F

U029FLost Communication With Evaporative Emission System Leak Detection Control Module

U029F is a generic communication fault indicating that the engine control module (ECM) or powertrain control module (PCM) has lost contact with the evaporative emission system leak detection control module over the controller area network (CAN) bus. The ECM sets this code when it stops receiving the periodic status messages that the leak detection module normally broadcasts, which can happen due to a wiring fault, a failed module, or a network issue.

SystemNetwork
Code typeGeneric (all makes)
SeverityLow
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.

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