Fault Codes/Cummins/426Cummins426UnclassifiedGeneralWhat This Code MeansShutdown; Data link errorPossible Causes•Datalink failure•No communications between the PCC control and the engine control module•The engine controller has sensed a fault condition and is broadcasting the fault messageSuggested Actions1Consult the engine service manualRelated Cummins Fault Codes689911425912418913379914286915285916Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 426 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 426GET THE ANSWERFree account required — we'll bring your question with you.