Fault Codes/Cummins/81Cummins81UnclassifiedGeneralWhat This Code MeansGenset shutdownPossible Causes•Optional customer selectionRelated Cummins Fault Codes82837710276103751067411561135Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 81 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 81GET THE ANSWERFree account required — we'll bring your question with you.