Fault Codes/Power Solutions International, Inc./891 4Power Solutions International, Inc.891 4UnclassifiedGeneralWhat This Code MeansMalfunction Indicator Lamp (MIL) ON; Closed Loop DisabledPossible Causes•Poor harness connections•Faulty sensorSuggested Actions1Check harness (post-control box harness, sensor side) for poor connections2Run the Closed-Loop test from the Tests page in EDISRelated Power Solutions International, Inc. Fault Codes1111117168611726851173643117760613255631351Browse all Power Solutions International, Inc. fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 891 4 on your specific Power Solutions International, Inc. unit — cited to the OEM manual, not a forum guess.TRY IT FREE