What causes a SPN 3484 code?

SPN 3484 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 3484 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3484 active.

How do I fix SPN 3484?

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 3484

SPN 3484 — Aftertreatment 1 Regeneration Inhibit Switch

What it means

Aftertreatment 1 Regeneration Inhibit Switch - Voltage Above Normal, Or Shorted To High Source / Voltage Below Normal, Or Shorted To Low Source.