What causes a SPN 3279 code?

SPN 3279 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 3279 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3279 active.

How do I fix SPN 3279?

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 3279

SPN 3279 Engine Particle Trap Regeneration Force Low

What it means

Indicates that the Diesel Particulate Filter (DPF) regeneration process has been inhibited or forced to stop due to insufficient temperature or flow requirements.