What causes a SPN 289 code?

SPN 289 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 289 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 289 active.

How do I fix SPN 289?

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 289

J1939 SPN 289 — Fuel/Air parameter

What it means

SPN 289 typically indicates that the Fuel Pressure or Air/Fuel ratio parameters are outside the expected range, often pointing to an issue with the Fuel Rail Pressure sensor or circuit.