Fault Codes/Discovery Energy, LLC (Rehlko)/P0638Discovery Energy, LLC (Rehlko)P0638WarningGeneralWhat This Code MeansP0638Possible Causes•Desired and actual throttle positions do not match.Suggested Actions1Troubleshoot the TP sensor leads. Refer to the Throttle Position (TP) Sensor Troubleshooting section.2Replace the throttle body. Refer to the Air - Fuel Mixer, Adapter, and Throttle Body Assembly section.Related Discovery Energy, LLC (Rehlko) Fault CodesP0642P0643P0606P0653P0605P0657P0604P0658P0603P0659P0563P0686Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for P0638 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about P0638GET THE ANSWERFree account required — we'll bring your question with you.