What causes a SPN 454 code?

SPN 454 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 454 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 454 active.

How do I fix SPN 454?

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 454

J1939 SPN 454 — Fuel/Air parameter

What it means

SPN 454 indicates an issue with 'Fuel/Air' parameters, specifically relating to fuel delivery pressure or air-to-fuel ratios as measured by the engine control module.