What does code U0654 mean?

DTC codes / U06xx · Network communication / U0654

U0654Lost Communication With Diesel Intake Air Flow A Position Sensor

U0654 is a network communication fault indicating that a control module has lost contact with the diesel intake air flow 'A' position sensor over the vehicle's serial data bus. The module expecting the sensor's signal has stopped receiving valid messages, so it sets this code and may substitute a default value or disable related functions.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.