What causes a SPN 95 code?

SPN 95 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 95 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 95 active.

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 95

J1939 SPN 95 — Engine parameter

What it means

SPN 95 refers to Fuel Filter Differential Pressure. This monitors the pressure drop across the fuel filter to determine if the filter is restricted or 'plugged.'