What causes a SPN 298 code?

SPN 298 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 298 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 298 active.

How do I fix SPN 298?

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 298

J1939 SPN 298 — Fuel/Air parameter

What it means

SPN 298 relates to the Brake Switch signal. It indicates a rationality fault where the ECM detects inconsistent signals between the brake pedal switch and other vehicle parameters (like throttle position or cruise control status).