Fault Codes/Cummins/FAIL-TO-SYNCHRONIZE WARNINGCumminsFAIL-TO-SYNCHRONIZE WARNINGUnclassifiedGeneralWhat This Code MeansFail-to-synchronize warning is activated; Synchronizing ceases (if lockout is enabled)Possible Causes•Permissive conditions are not met in the time specifiedRelated Cummins Fault CodesH268H389E153H669E125H706E089L028DS8 (RED)OFFDS7 (RED)OVER SPEEDBrowse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for FAIL-TO-SYNCHRONIZE WARNING on your specific Cummins unit — cited to the OEM manual, not a forum guess.TRY IT FREE