Fault Codes/Caterpillar/1371-040Caterpillar1371-040UnclassifiedAir IntakeWhat This Code MeansFreezing; Corrosion of internal parts; Malfunction of the air starting systemPossible Causes•Moisture and sediment in the air starting systemSuggested Actions1Open the drain valve that is on the bottom of the air tank and allow the moisture and sediment to drain.2Close the drain valve.Related Caterpillar Fault Codes1466-543-M&S7452-04013711064-08113951395-0441395-0811361-0401395-0821357-5101396Browse all Caterpillar fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 1371-040 on your specific Caterpillar unit — cited to the OEM manual, not a forum guess.TRY IT FREE