What does code U04B2 mean?

Q: What does code U04B2 mean?

Invalid Data Received From Particulate Matter Sensor B. U04B2 is a communication fault where the engine control module (ECM) or another onboard computer has lost valid data from the particulate matter (PM) sensor, specifically sensor B. The computer detects missing, corrupted, or implausible messages from that sensor over the vehicle's communication network, so it cannot trust the soot readings used for diesel particulate filter (DPF) management.

DTC codes / U04xx · Invalid data received from a module / U04B2

U04B2Invalid Data Received From Particulate Matter Sensor B

U04B2 is a communication fault where the engine control module (ECM) or another onboard computer has lost valid data from the particulate matter (PM) sensor, specifically sensor B. The computer detects missing, corrupted, or implausible messages from that sensor over the vehicle's communication network, so it cannot trust the soot readings used for diesel particulate filter (DPF) management.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.