What causes a SPN 474 code?

SPN 474 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 474 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 474 active.

How do I fix SPN 474?

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 474

J1939 SPN 474 — Fuel/Air parameter

What it means

Remote Starter Solenoid Control or Starter Interlock circuit fault. The ECM has detected an electrical issue (short to ground, short to battery, or open circuit) on the line that controls the starter motor relay.