Fault Codes/Cummins/5669Cummins5669UnclassifiedGeneralWhat This Code MeansWarning lamp active; Displayed message: ENGINE COMBUSTION FAULTPossible Causes•Intake Manifold Over Pressure•The engine controller has sensed a fault condition and is broadcasting the fault messageSuggested Actions1Consult Engine Service ManualRelated Cummins Fault Codes659891155187100535186AMBER3131BATTERY OUT OF RANGE HIGH OR PRE-HIGH2977CRANK FAIL2964D041Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 5669 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 5669GET THE ANSWERFree account required — we'll bring your question with you.