What causes P1299 on a Ford?

Low coolant level from a leak in hoses, radiator or water pump Failed thermostat stuck closed Inoperative cooling fan or fan clutch Failed water pump or slipping drive belt Faulty CHT sensor falsely reporting over-temperature

How do I fix P1299 on a Ford?

Stop driving and let the engine cool — fail-safe mode alternately disables cylinders to limit damage Check coolant level and pressure test the system for leaks Verify thermostat operation and cooling fan engagement Inspect the water pump and belt condition Diagnose the CHT sensor only after confirming the cooling system is healthy

P1299 Cylinder Head Over-Temperature Protection Active

Q: What does P1299 mean on a Ford?

P1299 — Cylinder Head Over-Temperature Protection Active. Applies to F-150, Super Duty, Mustang, Explorer with fail-safe cooling strategy.

Category: Powertrain - Fuel/Air Metering
Severity: Severe
Applies to: F-150, Super Duty, Mustang, Explorer with fail-safe cooling strategy

What does P1299 mean on a Ford?

P1299 — Cylinder Head Over-Temperature Protection Active. This Ford-enhanced code applies to F-150, Super Duty, Mustang, Explorer with fail-safe cooling strategy.

Common causes of P1299

Low coolant level from a leak in hoses, radiator or water pump
Failed thermostat stuck closed
Inoperative cooling fan or fan clutch
Failed water pump or slipping drive belt
Faulty CHT sensor falsely reporting over-temperature

How to fix P1299

Stop driving and let the engine cool — fail-safe mode alternately disables cylinders to limit damage
Check coolant level and pressure test the system for leaks
Verify thermostat operation and cooling fan engagement
Inspect the water pump and belt condition
Diagnose the CHT sensor only after confirming the cooling system is healthy