Fault Codes/Discovery Energy, LLC (Rehlko)/D12Discovery Energy, LLC (Rehlko)D12UnclassifiedGeneralWhat This Code MeansDetonation warningRelated Discovery Energy, LLC (Rehlko) Fault CodesD13D15ALRTEMERGENCY STOP3217 5ENGINE STA1695 18GROUND FAULT1270 6J1939CAN SHUTDOWNLOAD SHED KW OVERLOAD SHED UNDER FREQUENCYBrowse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for D12 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about D12GET THE ANSWERFree account required — we'll bring your question with you.