Fault Codes/Rehlko/BATTERY VOLTAGE LOW WRehlkoBATTERY VOLTAGE LOW WUnclassifiedElectricalWhat This Code MeansEngine starting battery voltage falls below 12.5 VDC for more than 90 seconds when the engine is not runningPossible Causes•Incorrect battery rating or poor battery condition•Faulty battery charger operation•Low battery chargeSuggested Actions1Check the battery rating and condition2Check the battery charger operation3Charge or replace the batteryRelated Rehlko Fault CodesBUSDEADLIVECFGMODELNUMBATTERY VOLTAGE HIGH WCFGSYSVOLTBATTERY HIGHCHECK AC SENS LOSSBATTERY CRLOCONCHECKFAILAGS-10CONNOTDETERMADC-RESCURRENT A HIGHBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for BATTERY VOLTAGE LOW W on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE