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DTC codes / U02xx · Lost communication with a control module / U02BA

U02BALost Communication With Hybrid/EV Electronics Coolant Pump B

U02BA means the module that monitors the hybrid or electric vehicle electronics coolant pump B has stopped receiving expected communication from that pump over the vehicle's communication network. The computer detected a loss of the periodic status messages the pump normally broadcasts, so it cannot confirm the pump is running or reporting correct temperature and speed data.

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.

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