What causes a SPN 414 code?

SPN 414 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 414 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 414 active.

How do I fix SPN 414?

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 414

J1939 SPN 414 — Fuel/Air parameter

What it means

SPN 414 indicates a 'Boost Pressure / Fuel Flow Out of Range' or a discrepancy in the Fuel/Air ratio parameters, typically related to the relationship between boost pressure and fuel delivery.