What causes a SPN 788 code?

SPN 788 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 788 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 788 active.

How do I fix SPN 788?

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 788

J1939 SPN 788 — Engine Management parameter

What it means

Engine Management Data Error - Indicates that the electronic control module has detected an error or inconsistency in its internal configuration parameters or software tables.