331 is an traction encoder problem, make sure the encoder is tight via the set screw. Is it the old square encoder or new round style encoder? Also 814 i believe is associated to a battery code, check and make sure the battery is in good condition as well as topped off with water. A failing battery can cause traction and lift problems with any Access module trucks. Report back with you findings please.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.