What causes a SPN 6454 code?

SPN 6454 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 6454 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 6454 active.

How do I fix SPN 6454?

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 6454

Cummins fault code 6454

What it means

Aftertreatment Backup Fuel Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level. This indicates the backup fuel pressure sensor for the aftertreatment system is reading lower than the expected threshold.