Fault Codes/Discovery Energy, LLC (Rehlko)/P0172Discovery Energy, LLC (Rehlko)P0172WarningGeneralWhat This Code MeansP0172Possible Causes•Problem with fuel delivery or fuel feedback control.Suggested Actions1Check for other DTC codes or misfires.2Check for exhaust restrictions.3Check fuel system for restrictions.4Confirm fuel quality and fuel pressure.5Check fuel pressure regulator.Related Discovery Energy, LLC (Rehlko) Fault CodesP0335P0508P0171P0509P0121P0563P0118P0603P0117P0604P0116P0605Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for P0172 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about P0172GET THE ANSWERFree account required — we'll bring your question with you.