Fault Codes/Rehlko/LO CRANK VLT WRehlkoLO CRANK VLT WUnclassifiedGeneralWhat This Code MeansLow cranking voltage; Battery voltage dropped below 3.5 VDC during engine crankingPossible Causes•Depleted or faulty battery•No exercise has been scheduled on the RDC2 controller.Suggested Actions1Charge the battery2Replace the battery3See Section 2.5 for instructions to set the exerciser.Related Rehlko Fault CodesLOCKED ROTOR SDLOW BATTERY VOLTSLFLOWBATTERYVOLTSLED4LWTHIGH ENGINE TEMPERATUREMAINPWROVERLHIGH BATTERY VOLTAGEMAINPWROVERL SDHETMAINPWROVERL SHUTDOWNBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for LO CRANK VLT W on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE