What causes a SPN 1859 code?

SPN 1859 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 1859 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1859 active.

How do I fix SPN 1859?

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 1859

SPN 1859 - Particle Sensor Element Temperature Monitoring

What it means

This fault indicates that the Particulate Matter (PM) sensor element is failing to reach or maintain its required operating temperature for soot regeneration and measurement.