ADAPTER AS 1035522 - Caterpillar

Use this procedure in order to troubleshoot low coolant level. Also, use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Event Codes
CDL Code and Description Conditions which Generate this Code System Response
E057(2) Low Engine Coolant Level Derate The engine coolant level has fallen below the coolant level sensor for the specified delay time. Engine power is derated. The code is logged.
E059(1) Low Engine Coolant Level Warning The engine coolant level has fallen below the coolant level sensor for the specified delay time. The code is logged. Probable Causes
Low coolant level and/or coolant leakage
Coolant level sensorRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps Values Results
1. Low Coolant Level and/or Coolant Leakage
A. Inspect the coolant level
Coolant level
Result: The engine coolant level is OK.
Proceed to Test Step 2.
Result: The engine coolant level is not OK.
Troubleshoot the cause of the incorrect coolant level.
1. Check for the correct mixture of antifreeze and water. Refer to Operation and Maintenance Manual.
2. Check the cooling system for leaks. Repair any leaks immediately.
3. Check for air in the cooling system. Refer to Systems Operation/Tesing and Adjusting for the correct procedure.
2. Coolant Level Sensor
A. If an electrical problem with the coolant level sensor is suspected, refer to Troubleshooting, "Coolant Level - Test" for information that is related to troubleshooting an electrical problem with the coolant level sensor.
Coolant level sensor
Result: The coolant level sensor is not operating properly.
Replace the coolant level sensor. If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).