Fault Codes/Cummins/H268CumminsH268UnclassifiedGeneralWhat This Code MeansEquipment shutdownPossible Causes•Low coolant levelRelated Cummins Fault CodesH389H669FAIL-TO-SYNCHRONIZE WARNINGH706E153L028E125OFFE089OVER SPEEDDS8 (RED)RED − FLASHINGBrowse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for H268 on your specific Cummins unit — cited to the OEM manual, not a forum guess.TRY IT FREE