What causes a SPN 885 code?

SPN 885 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 885 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 885 active.

How do I fix SPN 885?

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 885

J1939 SPN 885 — Engine Management parameter

What it means

SPN 885 FMI 2/7/14 - Aftertreatment 1 SCR Catalyst System Out of Calibration. This code indicates the SCR system is not effectively reducing NOx levels as expected.