What causes a SPN 3489 code?

SPN 3489 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 3489 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3489 active.

How do I fix SPN 3489?

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 3489

Aftertreatment #1 Exhaust Gas Pressure 1 High

What it means

The Engine Control Module (ECM) has detected that the exhaust gas pressure upstream of the Diesel Particulate Filter (DPF) is above the maximum acceptable threshold.