What causes a SPN 581 code?

SPN 581 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 581 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 581 active.

How do I fix SPN 581?

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 581

J1939 SPN 581 — Engine Management parameter

What it means

SPN 581 refers to the Engine Management transmission gear data, indicating an issue with how the engine module interprets the current gear selection or shift request signal.