What causes a SPN 585 code?

SPN 585 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 585 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 585 active.

How do I fix SPN 585?

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 585

J1939 SPN 585 — Engine Management parameter

What it means

The Engine Management Parameter code indicates a communication error or data mismatch regarding specific engine control instructions on the J1939 data link.