What causes a SPN 739 code?

SPN 739 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 739 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 739 active.

How do I fix SPN 739?

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 739

J1939 SPN 739 — Engine Management parameter

What it means

The J1939 SPN 739 refers to a fault in the communication or processing of Engine Management Parameters. It suggests that the expected data regarding engine configuration or management settings is missing or corrupted on the data bus.