What causes a SPN 319 code?

SPN 319 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 319 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 319 active.

How do I fix SPN 319?

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 319

J1939 SPN 319 — Fuel/Air parameter

What it means

SPN 319 typically relates to a deviation between the commanded fuel pressure and the actual pressure detected in the fuel rail or air-to-fuel ratio imbalances.