What causes a SPN 2998 code?

SPN 2998 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 2998 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2998 active.

How do I fix SPN 2998?

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 2998

J1939 SPN 2998 — Aftertreatment/Emissions parameter

What it means

SPN 2998 indicates an Aftertreatment System Parameter out of range or an invalid data transfer between the engine and the emissions control system. It often refers to a specific state or status message that the controller cannot interpret.