What causes a SPN 1484 code?

SPN 1484 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 1484 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1484 active.

How do I fix SPN 1484?

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 1484

SPN 1484 Diesel Particulate Filter Regenerating Inhibit Switch

What it means

Indicates that the manual DPF regeneration inhibit switch has been activated or there is a circuit fault preventing the system from performing an active regeneration.