SEAL-O-RING 4587598 - Caterpillar

The Electronic Control Module (ECM) detects a low coolant level. Information on default settings and ranges for this event can be found in Troubleshooting, "Event Codes".System Response:The ECM will log the event.Possible Performance Effect:
There are no performance effects.Troubleshooting
The coolant level is most likely low.
There may be a problem with the coolant level sensor.Test Step 1. Check the Coolant Level
Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Stop the engine.
Allow the engine to cool. Check the coolant level. Refer to the Operation and Maintenance Manual for the proper procedure. Note: The coolant level sensor should be completely immersed in coolant.Note: If the coolant has been changed recently, ensure that the air has been purged from the cooling system. Refer to Systems Operation/Testing and Adjusting, "Cooling System" for additional information.Expected Result:The coolant level is low.Results:
OK - The coolant level is low.Repair: Check the cooling system for leaks. Repair any problems that are found. Refill the cooling system to the proper level.STOP
Not OK - The coolant level is not low.Repair: There may be a problem with the coolant level sensor. Refer to the diagnostic functional test Troubleshooting, "Coolant Level Sensor Circuit - Test" in order to verify that the coolant level sensor is operating correctly.There may be an intermittent problem. Monitor the operation of the engine and repair any problems.Ensure that the repair eliminates the original problem.STOP