Fault Codes/Discovery Energy, LLC (Rehlko)/P0604Discovery Energy, LLC (Rehlko)P0604WarningGeneralWhat This Code MeansP0604Possible Causes•There is a problem with the ECM RAM.Suggested Actions1Clear the DTC code and turn the ECM power off. Wait fifteen minutes and check if the code is regenerated.2Replace the ECM. Refer to the Electronic Control Module (ECM) section.Related Discovery Energy, LLC (Rehlko) Fault CodesP0605P0606P0603P0638P0563P0642P0509P0643P0508P0653P0335P0657Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for P0604 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about P0604GET THE ANSWERFree account required — we'll bring your question with you.