What causes a SPN 918 code?

SPN 918 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 918 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 918 active.

How do I fix SPN 918?

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 918

J1939 SPN 918 — Engine Management parameter

What it means

SPN 918 indicates an issue with the Engine Management System's Power Take-Off (PTO) Enable Switch circuit. This parameter monitors the requested state of the PTO engagement.