What causes a SPN 776 code?

SPN 776 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 776 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 776 active.

How do I fix SPN 776?

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 776

J1939 SPN 776 — Engine Management parameter

What it means

The J1939 SPN 776 indicates a fault within the Engine Management Parameter settings. This usually points to a configuration error or a memory fault within the Electronic Control Module (ECM) related to specific operating parameters.