P1299 on Jeep
Cylinder Head Over-Temperature Protection Active (manufacturer-specific, Ford)
P1299 on Jeep vehicles indicates cylinder head over-temperature protection active (manufacturer-specific, ford). Au7o has documented this code across 1 Jeep model — most commonly on Wrangler. 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.
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 Jeep by Model
Jeep Wrangler(1 issue)
- 4xe Engine Sand-Casting Contamination — Loss of Propulsion / Engine Fire (Recall 25V-766 / 78C)2024-2025
NHTSA recall 25V-766 (Jeep campaign 78C) covers approximately 77,927 model-year 2024-2025 Wrangler 4xe (and related Grand Cherokee 4xe) vehicles whose 2.0L engine blocks may not have been properly cleaned of casting sand at the supplier between June 2023 and March 2024. Residual sand can circulate through internal engine components and cause catastrophic engine failure, sudden loss of propulsion, or an engine-compartment fire. By late October 2025 FCA reported awareness of 36 fires, ~50 loss-of-propulsion field reports, 144 warranty claims, and 3 injuries. A definitive repair was still in development at recall launch, with VIN lookups and owner notifications initiated.
Looking for P1299 on a different make?
View P1299 across all makes →Frequently Asked Questions
What does P1299 mean on Jeep?▼
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 Jeep specifically, this code is documented across 1 model.
What causes P1299 on Jeep vehicles?▼
Common causes on Jeep: 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 Jeep?▼
Repair costs vary widely depending on the root cause and specific Jeep model.
Which Jeep models have P1299 documented?▼
Au7o has documented P1299 on 1 Jeep model: Wrangler.