CAT

The ECM detects the following conditions: •The engine coolant temperature is greater than 106 °C (223 °F) for the C-10 or C-12.•The engine coolant temperature is greater than 111 °C (232 °F) for the 3406E.•The engine has been running for at least 30 seconds. Probable Causes: 1) Low coolant level2) Improper antifreeze (Wrong mix/type)3) Air in the cooling system4) Fan clutch failure/malfunction5) Coolant temperature sensor/harness6) Radiator failure7) Radiator filler cap failure8) Charge air cooler failure9) Fan, fan belt, or fan shroud failure10) Restriction in air inlet or exhaust system11) Water temperature regulator12) Water pump failure13) High outside temperature or high...

The ECM detects the following conditions: •The engine coolant temperature is greater than 103 °C (217 °F) for the C-10 or C-12.•The engine coolant temperature is greater than 108 °C (226 °F) for the 3406E.•The engine has been running at least 30 seconds. This is a warning code only, not an actual diagnostic code. A diagnostic code will be set if the issue is serious.

The ECM detects the following conditions: •The coolant level is low for more than ten seconds. Probable Causes: 1) Coolant level2) Coolant level sensor/harness

The Engine Control Module (ECM) detects the following conditions: •The coolant level is very low for more than 30 seconds.•The “Coolant Level Sensor” parameter is programmed to “Yes”. Probable Causes: 1) Coolant level2) Coolant level sensor/harness

The Engine Control Module (ECM) detects the following conditions: •The coolant level sensor indicates that the coolant level is low.•The “Coolant Level Sensor” is programmed to “4 Pin” or “2-wire Float Sensor”.•The engine has less than six hours of total operating time. Note: This diagnostic code will only occur in the first six hours of engine operation Probable Causes: 1) Coolant level low2) Coolant level sensor/harness