Fault Codes/Cummins/H706CumminsH706UnclassifiedGeneralWhat This Code MeansEquipment shutdownPossible Causes•Low coolant levelRelated Cummins Fault CodesL028OFFH669OVER SPEEDH389RED − FLASHINGH268SERVICE DUEFAIL-TO-SYNCHRONIZE WARNINGE153E125E089Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for H706 on your specific Cummins unit — cited to the OEM manual, not a forum guess.TRY IT FREE