Fault Codes/Caterpillar/7400Caterpillar7400UnclassifiedStartingWhat This Code MeansEngine shutdown; Engine fails to startPossible Causes•Critical operating temperature level reached•Critical operating pressure level reached•Critical operating coolant level reached•Critical operating speed (rpm) reachedSuggested Actions1Determine the cause of the engine shutdown and make necessary repairs2Reset the particular shutoff before attempting to restart the engineRelated Caterpillar Fault Codes74181453-0401451-04074504471-5107452-0404471-081-T754244627542-554-OC4450-535-LABrowse all Caterpillar fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 7400 on your specific Caterpillar unit — cited to the OEM manual, not a forum guess.TRY IT FREE