What causes a SPN 3218 code?

SPN 3218 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 3218 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3218 active.

How do I fix SPN 3218?

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 3218

SPN 3218 — Aftertreatment 1 Intake NOx Sensor Heater Preliminary FMI

What it means

Aftertreatment 1 Intake NOx Sensor Heater control circuit fault indicating the heating element is not reaching or maintaining operating temperature.