What causes a SPN 1862 code?

SPN 1862 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 1862 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1862 active.

How do I fix SPN 1862?

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 1862

SPN 1862 - Aftertreatment Diesel Particulate Filter Regeneration Inhibit Due to Low DPF Temperature

What it means

The engine control module has detected that the Diesel Particulate Filter (DPF) temperature is too low to initiate or maintain a regeneration process.