What causes a SPN 1444 code?

SPN 1444 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 1444 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1444 active.

How do I fix SPN 1444?

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.

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J1939 SPN

SPN 1444

SCR Reagent Dosing Rate (Bank 2) Error

What it means

The amount of DEF being injected into the second exhaust bank does not match the commanded rate.

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