What causes a SPN 274 code?

SPN 274 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 274 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 274 active.

How do I fix SPN 274?

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 274

J1939 SPN 274 — Fuel/Air parameter

What it means

Relates to a generic Intake Air or Fuel parameter communication error over the J1939 data link, often specific to the Intake Air Heater or fuel pressure sensors.