P1299: Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)
4 vehicles · 3 makes · $250-$9,000 repair
Most Reported On
P1299 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2005-2010 Ford Mustang, 2024-2025 Jeep Wrangler (4xe, Sahara 4xe, Rubicon 4xe), and 2019-2020 Lincoln Nautilus (Standard, Select, Reserve), plus 1 other vehicle, with repair costs ranging from $250 to $9,000.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1299, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (4)
FAQ
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 $250 to $9,000, depending on the vehicle and root cause.
Which vehicles are affected by P1299?
Au7o has documented P1299 across 4 vehicle models from 3 manufacturers: Ford, Jeep, Lincoln.
Sources (9)
- ForumCarComplaints - Ford Mustang cooling system complaints (4.0L thermostat housing leak reports)
- RecallPart 573 Safety Recall Report 25V-766 (NHTSA)
- article2021-2025 Jeep Wrangler 4xe Loss of Power Problem | 25V766 — Lemberg Law
- TSB2.0L EcoBoost - Low Coolant/White Smoke/MIL with DTCs - 2019-2020 Edge/Nautilus (TSB 20-2234)
- Forum2019 Nautilus - White Smoke / Coolant Reservoir Empty / Smell inside - Lincoln Forums
- articleNewer Ford, Lincoln Vehicles Plagued by EcoBoost Coolant-Leak Defect, Class Action Says
- RecallFord Recall / Campaign 17S09 (1.6L EcoBoost coolant/overheat)
- articleFord Fusion Coolant Leak Recall: Engines, Lawsuits & What Gets Covered
- articleWhy Does the EcoBoost Engine Keep Catching on Fire?
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.