P1299: How to Diagnose & Fix — Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)
3 vehicles · 2 makes · $1,200-$6,000 repair
How to diagnose and fix P1299: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford Fusion · 2013–2014
Early 1.6L EcoBoost Fusions can suffer a localized lack of coolant circulation that overheats one corner of the cylinder head; the head cracks and pushes oil/coolant onto the hot exhaust, and vehicle fires occurred while driving or after shutdown. Ford recall 12V551 (Ford 12S41) covers 2013 Fusion 1.6L vehicles built February 3 through November 29, 2012, and recall 17V209 (Ford 17S09) covers 2013-2014 Fusion 1.6L GTDI vehicles; the failure mode is distinct from the 1.5L coolant-into-cylinder intrusion issue.
Common Symptoms
- Coolant loss with no obvious external leak
- Engine overheating / temperature warning
- White exhaust smoke or misfire
- Smell of burning oil, smoke from engine bay
- Fire while driving or after shutdown
How to Fix
Under recall dealers inspect for coolant-system leaks and reprogram the PCM and instrument cluster with an updated overheat-detection/limp-home strategy; damaged engines are repaired as needed. Under recall 17V209 (Ford 17S09) dealers also install a coolant level sensor with supporting hardware and software. Owners should never keep driving after a coolant-loss/overheat warning. A cracked head from overheating typically requires head or long-block replacement out of warranty.
Sources for this issue (3)
Lincoln Nautilus · 2019–2020
Some 2.0L EcoBoost Nautilus SUVs may show low coolant, white smoke from the tailpipe, an over-temperature warning, an external coolant leak and/or a check-engine light with stored codes. Ford attributes this to the exhaust gas recirculation (EGR) cooler and/or PCM software settings. Applies to: 2019–2020 Lincoln Nautilus with the 2.0L EcoBoost engine (bulletin 20-2234 also covers the 2019–2020 Ford Edge 2.0L).
How to Fix
Have a dealer confirm the symptoms and codes. Bulletin 20-2234 has vehicles built on or before 9-Jul-2020 get the latest PCM software first, then a cooling-system pressure test and inspection of the EGR cooler for damage or internal leaks; if the EGR cooler leaks, the EGR cooler and EGR outlet tube are replaced. If the cooler does not leak, the technician follows standard workshop-manual diagnosis. Normal warranty rules apply; this is not a recall or a promise of free repair.
Sources for this issue (2)
Ford Edge · 2007–2014
On the 3.5L and 3.7L Duratec V6 the water pump is driven off the timing chain and lives INSIDE the oil-lubricated front timing cover, not bolted to the outside of the block. When the pump's shaft seal and bearing wear out (commonly 90k-130k miles), coolant does not drip onto the driveway - it runs down the weep passage and, once the passage plugs or the seal fully lets go, straight into the crankcase. Owners report the first sign is a slowly dropping coolant reservoir with no visible external leak, then milky residue on the dipstick and oil cap. Coolant-contaminated oil destroys rod and main bearings and scores cylinder walls, which is why so many of these turn into engine replacements rather than pump jobs. A class-action suit was filed against Ford over this design. The labor is brutal because the front cover, timing chains and often the engine's front accessory drive must come off, and many shops quote the job with the engine partially lifted.
Common Symptoms
- Coolant reservoir level drops with no visible external leak
- Milky/tan residue on oil dipstick or under the oil filler cap
- Coolant smell but no puddle under the vehicle
- Overheating or temp gauge climbing after a highway run
- Whining or growl from the front of the engine
- Low oil pressure warning or knocking once bearings are damaged
How to Fix
Treat the internal water pump as a scheduled maintenance item at roughly 90k-100k miles rather than waiting for failure. Check the oil dipstick and fill cap at every fuel stop for milkiness and watch the degas bottle level - a slow drop with no external leak is the tell. If caught before contamination, replace the water pump, front cover gasket, timing chain guides and tensioners while the cover is off. If oil is already milky, the engine needs a full flush and bearing inspection; most contaminated engines are replaced. Use the updated Motorcraft pump, not a budget aftermarket unit.
Sources for this issue (4)
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P1299 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1299 mean?
P1299 stands for "Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)." P1299 is a manufacturer-specific powertrain code, most commonly on Ford, indicating that the Cylinder Head Temperature (CHT) sensor detected an engine overheating condition and the computer has activated a fail-safe cooling strategy to protect the engine. The PCM may reduce power and shut off fuel to some cylinders to limit heat, often putting the vehicle in a limited 'limp' mode. This means the engine is running too hot and continued driving risks serious engine damage, so the vehicle should be stopped and cooled as soon as it is safe.
What are the most common causes of P1299?
The most common causes of P1299 are: Low coolant level or coolant loss/leak, Stuck-closed thermostat, Failed water pump, Cooling fan not operating, Faulty cylinder head temperature (CHT) sensor, Blocked radiator or restricted coolant flow, Head gasket failure or air in the cooling system. The specific cause varies by vehicle.
How much does it cost to fix P1299?
Repair costs for P1299 range from $1,200 to $6,000, depending on the vehicle and root cause.
Which vehicles are affected by P1299?
Au7o has documented P1299 across 3 vehicle models from 2 manufacturers: Ford, Lincoln.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.