Fault Codes/Power Solutions International, Inc./1603Power Solutions International, Inc.1603UnclassifiedElectricalWhat This Code MeansRelay Off High Voltage; VRelay is less than %VBat specified in the calibrationPossible Causes•Faulty power relay fuse•Incorrect battery voltage to and from the power relaySuggested Actions1Perform On-Board (OBD) System Check2Locate VRelay voltage on EDIS RawVolts page with Key ON, Engine On3Check power relay fuse and repair as needed4Check for battery voltage to and from the power relay and repair as needed5Refer to diagnostics for the set fault, repair and retestRelated Power Solutions International, Inc. Fault Codes6987DTC 107160 2DTC 237154DTC 562123DTC 64212211216121613Browse all Power Solutions International, Inc. fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 1603 on your specific Power Solutions International, Inc. unit — cited to the OEM manual, not a forum guess.TRY IT FREE