Home » Training » Trailer Glossary » SAE J1939 SAE J1939SAE J1939 is a set of standards that define how ECUs communicate via the CAN bus in heavy-duty vehicles. Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on Reddit (Opens in new window) Reddit Share on Pinterest (Opens in new window) Pinterest Share on LinkedIn (Opens in new window) LinkedIn