What causes a SPN 2744 code?

SPN 2744 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 2744 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2744 active.

How do I fix SPN 2744?

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 2744

J1939 SPN 2744 — Aftertreatment/Emissions parameter

What it means

Aftertreatment 1 Intake Gas Temperature 2 - Data Valid But Above Normal Operating Range - Least Severe Level. This code specifically monitors the temperature of the exhaust gases as they enter or flow through the SCR sub-assembly.