What causes a SPN 1401 code?

SPN 1401 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 1401 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1401 active.

How do I fix SPN 1401?

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

Log in Sign up

J1939 SPN

SPN 1401

Aftertreatment Fuel Pressure Low

What it means

Indicates the fuel pressure at the regeneration injector is below the commanded threshold.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free