What does code U0656 mean?

DTC codes / U06xx · Network communication / U0656

U0656Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor

U0656 is a network communication fault indicating that a control module has lost contact with the turbocharger or supercharger boost control 'A' position sensor over the vehicle's Controller Area Network (CAN) bus. The computer has detected that expected messages from this sensor have stopped arriving, so it cannot verify the actual position of the boost control actuator.

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.