Fault Codes/Rehlko/I/OMODULECOMMSLOSTRehlkoI/OMODULECOMMSLOSTUnclassifiedGeneralWhat This Code MeansI/OModuleCommsLostPossible Causes•Communication to an installed I/O module has been lostSuggested Actions1Check I/O module connections (See Section 2.5.6)Related Rehlko Fault CodesI/OMODULECOMMUNICATIONSLOSTI/OMODULELOSTCOMMI/O MODULE NOT FOUNDI/OMODULENOTFOUNDI/O MODULE LOST COMMI/OMODULENOTINSTALLEDI/O MODULE COMMUNICATIONS LOSTINPHASE MONITOR (IPM) SYNCHINGHWTINTERN ERROR SHUTDWNHIGH ENGINE TEMPERATUREIPM SYNCHING (IN-PHASE MONITOR SYNCHING)Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for I/OMODULECOMMSLOST on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about I/OMODULECOMMSLOSTGET THE ANSWERFree account required — we'll bring your question with you.