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DTC codes / U04xx · Invalid data received from a module / U04A8

U04A8Invalid Data Received From Hybrid/EV Battery Interface Control Module H

U04A8 is a communication fault where the vehicle's main control modules have stopped receiving valid data from the Hybrid/EV Battery Interface Control Module H, which is the electronic gateway that translates and relays battery pack data to the rest of the car. The computer detected that messages from this module are either missing, corrupted, or arriving with implausible values, so it has flagged the data link as unreliable.

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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