P1299
Cylinder Head Overtemperature Protection Active
Critical· Stop drivingIntermediatePowertrainManufacturer: Ford
What it means
On Ford engines the cylinder head temperature has got so high that the ECU has started cutting fuel to cylinders to cool the engine down. The engine is overheating.
Is it safe to drive?
Stop as soon as it is safe and let the engine cool. Continuing can severely damage the engine.
Symptoms
- Temperature gauge high
- Loss of power
- Engine running on fewer cylinders
Probable causes
Most likely first
- 1Low coolant
- 2Cooling fan failure
- 3Stuck thermostat
- 4Failed water pump
- 5Faulty cylinder head temperature sensor
How to diagnose it
Work through these in order before buying parts
- 1Let the engine cool, then check the coolant level.
- 2Check fan operation.
- 3Pressure-test the cooling system.
- 4Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Repair the cooling system fault
- Replace the head temperature sensor if faulty
This information is general guidance for the listed makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.