P1299: Cylinder Head Overtemperature Protection Active (Ford)
Severity: high
What it means: On Ford vehicles, the engine computer has switched on its overheat protection mode because the cylinder head got too hot. It may shut off fuel to some cylinders to cool the engine.
Safe to drive? No. The engine is protecting itself from overheating. Pull over safely, shut it off, and let it cool before checking anything.
Common symptoms
- Sudden loss of power
- Temperature gauge high
- Engine running rough
- Check-engine light
Likely causes, ranked
- Low coolant or a coolant leakDIY
- Thermostat, water pump or cooling fan problemShop
- Coolant leaking into a cylinder (some engines)Shop
- Faulty cylinder head temperature sensorShop
Vehicle-specific notes
- 2015–2020 Lincoln MKZ: Ford bulletin 19-2346 lists P0217, P1285 and P1299 alongside misfire codes for coolant leaking into the cylinders on certain 2017–2019 MKZ 2.0L EcoBoost engines. Read the full answer · Source
What it means: On Ford vehicles, the engine computer has switched on its overheat protection mode because the cylinder head got too hot. It may shut off fuel to some cylinders to cool the engine.
Severity: High. Safe to drive? No. The engine is protecting itself from overheating. Pull over safely, shut it off, and let it cool before checking anything.
DIY or shop?
Checking coolant once cool is DIY. The cause of overheating needs a shop diagnosis.
Before you replace parts
- Stop and let the engine cool before opening the coolant cap.
- Check the coolant level and look for leaks, a stuck thermostat, or cooling fans that don't run.
- Read all stored codes. Misfire codes together with overheating codes can point to coolant leaking into a cylinder.
- Check your VIN for recalls, service bulletins and extended coverage.
Safety / mechanic note
Verify with a mechanic. Overheat protection mode is a warning to stop before engine damage happens. A code points to a circuit or system, not always a specific part.