What causes a SPN 369 code?

SPN 369 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 369 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 369 active.

How do I fix SPN 369?

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 369

J1939 SPN 369 — Fuel/Air parameter

What it means

The engine control module (ECM) has detected that the fuel/air ratio is outside of the calibrated parameters, indicating an imbalance in the combustion mixture.