Fault Codes/Rehlko/LO CRANK VLTRehlkoLO CRANK VLTUnclassifiedElectricalWhat This Code MeansLow cranking voltage; Battery voltage falls below 8 VDC for more than 6 seconds while starter is engagedPossible Causes•Low battery voltageSuggested Actions1Charge or replace the batteryRelated Rehlko Fault CodesOUOVERTEMP FAULTLBREACTIVE POWER LOWHBREAL POWER HIGHFS (1A-T)REAL POWER LOWFREQUENCY LOWREPLACE CLOCK BATTERYFREQUENCY HIGHRY CRLO WARNING WBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for LO CRANK VLT on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE