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DTC codes / U03xx · Software and configuration mismatches / U0349
U0349 is a network communication code indicating that a control module on the vehicle's CAN bus has reported a software incompatibility with the hybrid or electric vehicle battery interface control module, often called the Battery Energy Control Module (BECM). The computer detected that the software versions or calibration levels between the reporting module and the battery interface module do not match, preventing proper data exchange.
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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