Fault Codes/Power Solutions International/DTC 123Power Solutions InternationalDTC 123UnclassifiedGeneralWhat This Code MeansMIL ON during active fault; Engine ShutdownPossible Causes•TPS1 voltage is greater than 4.8V or less than 0.2V AND TPS2 voltage is greater than 4.8V or less than 0.2V•Simultaneous voltage out-of-range faults for both TPS 1 and TPS2•Throttle Position Sensor (TPS) failureSuggested Actions1Replace the electronic throttle assembly2Troubleshoot according to TPS1 voltage out-of-range following DTC 122 and 123 procedures3Troubleshoot according to TPS2 voltage out-of-range following DTC 222 and 223 proceduresRelated Power Solutions International Fault CodesDTC 127DTC 129DTC 121DTC 148DTC 102 9DTC 234DTC 52DTC 236DTC 51DTC 237DTC 15 74DTC 238Browse all Power Solutions International fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for DTC 123 on your specific Power Solutions International unit — cited to the OEM manual, not a forum guess.TRY IT FREE