What causes a SPN 370 code?

SPN 370 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 370 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 370 active.

How do I fix SPN 370?

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 370

J1939 SPN 370 — Fuel/Air parameter

What it means

SPN 370 indicates a diagnostic error in the fuel-to-air ratio management, specifically pointing to an unexpected condition in the fuel delivery system timing or quantity delivery relative to engine load.