What causes a SPN 864 code?

SPN 864 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 864 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 864 active.

How do I fix SPN 864?

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 864

J1939 SPN 864 — Engine Management parameter

What it means

SPN 864 identifies a configuration or communication error specifically related to Engine Management parameters transmitted over the J1939 data link. It often indicates the receiver is getting invalid or unexpected data regarding engine configuration.