What causes a SPN 2780 code?

SPN 2780 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 2780 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2780 active.

How do I fix SPN 2780?

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 2780

J1939 SPN 2780 — Aftertreatment/Emissions parameter

What it means

The Engine Control Module (ECM) has detected that the Diesel Particulate Filter (DPF) is no longer effectively trapping particulate matter or its efficiency has dropped below the calibrated threshold.