What causes a SPN 3481 code?

SPN 3481 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 3481 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3481 active.

How do I fix SPN 3481?

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 3481

Aftertreatment Hydrocarbon Dosing System Fuel Pressure Low

What it means

The engine control module has detected that the fuel pressure in the aftertreatment fuel injector (7th injector) system is below the commanded threshold.