Code Definition

U0111 — Lost Communication with Battery Energy Control Module A

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

About U0111

U0111 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for Infiniti vehicles. 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 U0111 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

On Infiniti hybrid models, the Engine Control Module (ECM), Hybrid Powertrain Control Module, and Vehicle Dynamic Control (VDC) module communicate with the Battery Energy Control Module (BECM), also called the Lithium Ion Battery Controller, over the CAN network to monitor high voltage battery status, state of charge, temperature, and energy management functions. DTC U0111 is set when a receiving control module does not receive valid CAN messages from Battery Energy Control Module A within the specified time threshold. This indicates a loss of communication that prevents proper hybrid system e...

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