What causes a SPN 3230 code?

SPN 3230 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 SPN 3230 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3230 active.

How do I fix SPN 3230?

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.

OBDIY

J1939 SPN

SPN 3230

SPN 3230 FMI 2 / 5 / 13 Diesel Particulate Filter Intake Pressure Sensor

What it means

This fault indicates an issue with the Diesel Particulate Filter (DPF) intake pressure sensor circuit, suggesting data is erratic, current is low, or the sensor requires calibration.