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DTC codes / U04xx · Invalid data received from a module / U04AB

U04ABInvalid Data Received From Hybrid/EV Battery Interface Control Module K

U04AB is a communication fault where the vehicle's main control modules report that the hybrid or electric vehicle battery interface control module designated as K is sending invalid or corrupted data over the controller area network (CAN) bus. The computer has detected that the module is present and communicating, but the data it transmits does not match the expected format or values, so the receiving module cannot trust it.

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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