What causes a SPN 954 code?

SPN 954 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 954 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 954 active.

How do I fix SPN 954?

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 954

J1939 SPN 954 — Engine Management parameter

What it means

Aftertreatment Fuel Pressure - This parameter represents the pressure of the fuel delivered to the aftertreatment hydrocarbon (HC) doser (7th injector) used for DPF regeneration.