What causes a SPN 814 code?

SPN 814 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 814 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 814 active.

How do I fix SPN 814?

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 814

J1939 SPN 814 — Engine Management parameter

What it means

SPN 814 indicates a failure or abnormality in Engine Management parameters transmitted via the J1939 data link. This often signifies a mismatch in software configuration or a communication timeout.