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DTC codes / U04xx · Invalid data received from a module / U04A1

U04A1Invalid Data Received From Hybrid/EV Battery Interface Control Module A

U04A1 means the vehicle's main computer received invalid or missing data from the hybrid or electric vehicle (EV) battery interface control module, which is the electronic gateway that translates and relays battery pack data to the rest of the car. The computer detected a communication fault where the expected battery status messages were corrupted, out of range, or absent, so it set this code and may limit hybrid or EV operation.

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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