What causes a U0674 code?

U0674 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a U0674 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0674 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

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OBD-II

U0674

Network/CAN bus communication code U0674

What it means

Communication lost with Particulate Matter (PM) Sensor Control Module. The soot sensor is not communicating.

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