What causes a SPN 694 code?

SPN 694 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 694 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 694 active.

How do I fix SPN 694?

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 694

J1939 SPN 694 — Engine Management parameter

What it means

Engine Management Parameter Mismatch/Error. This indicates that the ECM has detected a parameter setting that is incompatible with the vehicle configuration or is receiving conflicting data over the J1939 network.