What causes a SPN 294 code?

SPN 294 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 294 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 294 active.

How do I fix SPN 294?

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 294

J1939 SPN 294 — Fuel/Air parameter

What it means

SPN 294 refers to a fault in the Fuel/Air Control system, typically indicating an implausible signal or out-of-range data from the intake manifold pressure or air-fuel ratio monitoring system.