Fault Codes/Power Solutions International/157 4Power Solutions International157 4UnclassifiedCoolingWhat This Code MeansAUX DIG(N) voltage >=5.5 VDC; Coolant Level Stage 2 High Voltage; AUX_DIG(N) DTC activePossible Causes•Intermittent Problem•Faulty sensor•Faulty ECM•Faulty HarnessSuggested Actions1Perform On-Board (OBD) System Check2Measure the input voltage of AUX_DIG(N)3Replace with known good sensor and re-testRelated Power Solutions International Fault Codes18821711610241121352111136015171572520240:3DTC 18 7Browse all Power Solutions International fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 157 4 on your specific Power Solutions International unit — cited to the OEM manual, not a forum guess.TRY IT FREE