What causes a SPN 3268 code?

SPN 3268 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 3268 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3268 active.

How do I fix SPN 3268?

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 3268

SPN 3268 - Aftertreatment 1 SCR Intake Gas Pressure

What it means

This fault code monitors the pressure of exhaust gases entering the Selective Catalytic Reduction (SCR) system to ensure proper flow and dosing conditions.