Fault Codes/Rehlko/KD27V12RehlkoKD27V12UnclassifiedFuelWhat This Code MeansFuel leak; Supply voltage out of rangePossible Causes•Common rail leakage•Common rail leakage sensorRelated Rehlko Fault CodesNOX FAULTK0691DTCDERATE WARNINGDEF QUALITY ALERT1239 311239 111239 0662 0661 8661 5661 4Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for KD27V12 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE