What does code U04AD mean?

DTC codes / U04xx · Invalid data received from a module / U04AD

U04ADInvalid Data Received From Hybrid/EV Battery Interface Control Module M

U04AD indicates that a control module on the vehicle's network received invalid or missing data from the Hybrid/EV Battery Interface Control Module M, which is the module that manages communication and data reporting for the high-voltage battery pack. The computer detected a loss of valid serial data or a data message that failed internal plausibility checks, not necessarily a complete failure of the battery itself.

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.