GUARD GP-RADIATOR 3339986 - Caterpillar

The Electronic Control Module (ECM) has detected a low coolant level. Information on default settings and ranges for this event code can be found in Troubleshooting, "Event Codes".System Response:The event code will be logged.Possible Performance Effect:E552-1 (Warning)NoneE552-2 (Derate)The engine power will be derated.E552-3 (Shutdown)The engine will shut down.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.
After allowing the engine to cool, check the coolant level. Refer to the Operation and Maintenance Manual for the proper procedure. 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" in order to verify that the coolant level sensor is operating correctly.Ensure that any repairs eliminate the problem.STOP