What causes a SPN 997 code?

SPN 997 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 997 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 997 active.

How do I fix SPN 997?

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 997

J1939 SPN 997 — Engine Management parameter

What it means

This code indicates a configuration error where the Engine Management system detects that one or more parameters do not match the vehicle's hardware or the data being broadcast by other electronic control units.