What causes a SPN 740 code?

SPN 740 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 740 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 740 active.

How do I fix SPN 740?

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 740

J1939 SPN 740 — Engine Management parameter

What it means

Engine Management Parameter error. This indicates that one or more engine management settings within the ECM are out of range, missing, or incompatible with the current vehicle configuration.