What causes a SPN 293 code?

SPN 293 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 293 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 293 active.

How do I fix SPN 293?

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 293

J1939 SPN 293 — Fuel/Air parameter

What it means

SPN 293 typically refers to the Fan Drive Speed or Fan Speed Signal. It indicates that the Engine Control Module (ECM) is receiving an erratic, high, or low signal from the engine cooling fan speed sensor.