What causes a SPN 2725 code?

SPN 2725 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 2725 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2725 active.

How do I fix SPN 2725?

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 2725

J1939 SPN 2725 — Aftertreatment/Emissions parameter

What it means

SPN 2725 indicates a 'NOx Sensor Heater Control' or 'NOx Sensor Error' depending on the FMI, typically signifying that the ECM cannot communicate with or effectively control the heating element of a NOx sensor.