What this code means

The PCM has activated engine protection mode due to excessive coolant temperature. The PCM may reduce power output, disable cylinders, or limit RPM to prevent engine damage from overheating. This is a serious code that requires immediate attention.

Symptoms

• Reduced Engine Power message
• Engine overheating
• Temperature gauge in red zone
• Loss of power
• Engine may shut down
• A/C system disabled

Common causes

• Low coolant level
• Failed water pump
• Stuck closed thermostat
• Blocked radiator
• Faulty coolant temperature sensor
• Head gasket failure
• Cooling fan failure
• Collapsed radiator hose

Diagnostic steps

1. Check coolant level immediately
2. Inspect for coolant leaks
3. Test thermostat operation
4. Check water pump for flow
5. Test cooling fans
6. Inspect radiator for blockage
7. Pressure test cooling system
8. Check head gasket (combustion gas test)

Repair notes

Do not continue driving. Check coolant level and look for leaks immediately. Continued overheating will cause severe engine damage including head gasket failure and warped heads.

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