What does code U04AC mean?

DTC codes / U04xx · Invalid data received from a module / U04AC

U04ACInvalid Data Received From Hybrid/EV Battery Interface Control Module L

This code means the hybrid or electric vehicle battery interface control module is sending data that the rest of the vehicle network considers invalid or corrupted. The computer that set the code detected a message from that module with missing, out-of-range, or contradictory information rather than a complete, trustworthy data frame.

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.