GEAR 8Y6112 - Caterpillar

The Engine Control Module (ECM) detects the following conditions:
The C15 engine coolant temperature is greater than 110 °C (230 °F) for more than 20 seconds.
The C13 engine coolant temperature is greater than 111° C (232° F) for more than 5 seconds.
The engine has been running for at least 30 seconds.System Response:"DIAG" will be displayed next to the status for "Engine Coolant Temperature" on the Caterpillar Electronic Technician (ET). The check engine lamp and the warning lamp will illuminate.Note: If a high coolant temperature lamp is installed, the high coolant temperature lamp will turn on instead of the warning lamp.Customer passwords are required to clear this diagnostic code.Possible Performance Effect:The C15 engine will be derated by 25 percent for each 1 °C (1.8 °F) above 110 °C (230 °F) up to 100 percent.The C13 engine will be derated by 25 percent for each 1 °C (1.8 °F) above 111° C (232° F) up to 100 percent.A 100 percent derate means that the ECM will use a default torque map and vehicle speed will be limited to 72.4 km/h (45 mph).Note: If the "Engine Monitoring" parameter is programmed to "Shutdown", the engine will be shut down once this code has been active for 25 seconds.Note: If the "Engine Monitoring" parameter is programmed to "Warning", the engine power is not affected.Troubleshooting: Test Step 1. Check the Cooling SystemRefer to Testing and Adjusting, "Cooling System - Check".Results:
OK - STOP