Fault Codes/Generac/UNDERSPEEDGeneracUNDERSPEEDUnclassifiedSpeedWhat This Code MeansUnit will not start in AUTO with utility lossSuggested Actions1Check LEDs/Screen for alarms2Contact servicing dealerRelated Generac Fault CodesSTOPPED-ALARM RPM SENSE LOSSSTOPPED- ALARM RPM SENSOR LOSSRPM SENSOR LOSSR-200BPROBLEM 14OVERSPEED LEDOVERSPEEDOVERCRANK LEDNO CRANK SIGNALNO CAM SIGNALMIL CODEIGNITION MODULE FAULT INDICATORBrowse all Generac fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for UNDERSPEED on your specific Generac unit — cited to the OEM manual, not a forum guess.Your question about UNDERSPEEDGET THE ANSWERFree account required — we'll bring your question with you.