What causes a SPN 317 code?

SPN 317 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 317 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 317 active.

How do I fix SPN 317?

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 317

J1939 SPN 317 — Fuel/Air parameter

What it means

SPN 317 refers to a 'Fuel/Air' parameter error on the J1939 data link. It indicates that the system is receiving invalid or missing data regarding the fuel-to-air ratio or composition, which is critical for emissions and combustion control.