What causes a SPN 3468 code?

SPN 3468 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 3468 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3468 active.

How do I fix SPN 3468?

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 3468

SPN 3468 Aftertreatment 1 Intake Gas Sensor Power Supply

What it means

This fault indicates an electrical issue with the voltage supply to the SCR intake NOx or temperature sensor, typically resulting in a circuit short or open condition.