Fault Codes/Cummins/E089CumminsE089UnclassifiedGeneralWhat This Code MeansEquipment shutdownPossible Causes•Low coolant levelRelated Cummins Fault CodesE125E153DS8 (RED)FAIL-TO-SYNCHRONIZE WARNINGDS7 (RED)H268DS6 (YELLOW)H389D041H669CRANK FAILH706Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for E089 on your specific Cummins unit — cited to the OEM manual, not a forum guess.TRY IT FREE