What causes a SPN 1860 code?

SPN 1860 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 1860 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1860 active.

How do I fix SPN 1860?

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 1860

SPN 1860 FMI 14 - DPF Delta Pressure Plausibility

What it means

The Engine Control Module (ECM) detects that the Diesel Particulate Filter (DPF) differential pressure sensor reading is not plausible compared to expected engine air flow and exhaust pressure.