Fault Codes/Cummins/247Cummins247UnclassifiedElectricalWhat This Code MeansALTERNATOR RTD OOR warning displayedPossible Causes•Alternator temperature sensor output is out of range (OOR), high or lowRelated Cummins Fault CodesCODE 42CODE 43246CODE 4581OCODE 4881 UCODE 5781 OEMERGENCY STOP71F1Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 247 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 247GET THE ANSWERFree account required — we'll bring your question with you.