P1299 on Lincoln
Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)
P1299 on Lincoln vehicles indicates cylinder head over-temperature protection active (manufacturer-specific, ford). Au7o has documented this code across 1 Lincoln model — most commonly on Nautilus. 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. Typical repair costs on Lincoln range from $600 to $9,000, depending on the specific model and root cause.
Common Causes of P1299
- •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
P1299 on Lincoln by Model
Lincoln Nautilus(1 issue)
- 2.0L EcoBoost coolant loss / EGR cooler leak — low coolant, white smoke, overheat2019-2020
2019-2020 Nautilus models with the base 2.0L EcoBoost (non-hybrid) suffer unexplained coolant loss, white tailpipe smoke, an overheat warning, and sometimes coolant intrusion into the cylinders. Ford TSB 20-2234 traces the most common cause to a failing exhaust gas recirculation (EGR) cooler that leaks coolant internally; the related design also has a known coolant-intrusion weakness (narrow coolant slit between cylinders compromising the head-gasket seal). Owners report repeated coolant top-offs with no visible external leak, then misfires as coolant fouls the plugs. A June 2025 Ford EcoBoost coolant-intrusion class action covers 1.5L-2.0L engines; the most severe Nautilus cases require engine replacement with the redesigned block.
Looking for P1299 on a different make?
View P1299 across all makes →Frequently Asked Questions
What does P1299 mean on Lincoln?▼
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. On Lincoln specifically, this code is documented across 1 model.
What causes P1299 on Lincoln vehicles?▼
Common causes on Lincoln: Low coolant level or coolant loss/leak, Stuck-closed thermostat, Failed water pump, Cooling fan not operating, Faulty cylinder head temperature (CHT) sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1299 on a Lincoln?▼
Repair costs on Lincoln range from $600 to $9,000, depending on the specific model and root cause.
Which Lincoln models have P1299 documented?▼
Au7o has documented P1299 on 1 Lincoln model: Nautilus.