What causes a SPN 968 code?

SPN 968 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 968 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 968 active.

How do I fix SPN 968?

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 968

J1939 SPN 968 — Engine Management parameter

What it means

SPN 968 indicates a communication error or data transmission fault regarding Engine Management parameters over the J1939 data link. It often suggests that the ECM is not receiving expected configuration or status messages.