Fault Codes/Cummins/689Cummins689UnclassifiedGeneralWhat This Code MeansEngine speed erratic; Engine shutdownPossible Causes•Fault condition in the engine crankshaft sensor circuitRelated Cummins Fault Codes911912426913425914418915379916286917Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 689 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 689GET THE ANSWERFree account required — we'll bring your question with you.