Fault Codes/Cummins/2891Cummins2891UnclassifiedGeneralWhat This Code MeansAUX 102 1 Discrete input #1 fault is activePossible Causes•Miswired condition•Open circuit•Short circuitSuggested Actions1Check input 1 and J4-8 (reference input) for an open circuit, short circuit, or a miswired conditionRelated Cummins Fault Codes289328962888294228842943281629442678294526772977Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 2891 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 2891GET THE ANSWERFree account required — we'll bring your question with you.