Fault Codes/Cummins/O/VOLTSCumminsO/VOLTSUnclassifiedGeneralWhat This Code MeansLED lights in O/VOLTS conditionRelated Cummins Fault CodesOFFOVER SPEEDO/EXCPUT CONFIGURATION ERRORL028RED − FLASHINGH706SERVICE DUEH669UFROH389H268Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for O/VOLTS on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about O/VOLTSGET THE ANSWERFree account required — we'll bring your question with you.