What does code U0602 mean?

DTC codes / U06xx · Network communication / U0602

U0602Lost Communication With Particulate Filter Pressure Sensor B

U0602 means the engine control module (ECM) has lost the communication signal from the particulate filter pressure sensor B, which is used to monitor exhaust backpressure across the diesel particulate filter (DPF). The ECM detects this when the sensor's data bus message stops arriving or becomes invalid for a set period, so it cannot calculate filter loading or trigger a regeneration.

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.