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DTC codes / U04xx · Invalid data received from a module / U04A3

U04A3Invalid Data Received From Hybrid/EV Battery Interface Control Module C

U04A3 means the vehicle's main computer has lost valid data communication from the Hybrid/EV Battery Interface Control Module C, which is the electronic unit that monitors and reports on the high-voltage battery pack. The computer is not seeing the expected messages or is receiving corrupted data over the communication network, so it cannot trust the battery module's status.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaInvalid data received from a 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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