If you suspect the CHT (Your temp gauge never went up), you should jump to the section dealing with that below. We are going to work off of the assumption that the CHT sensor is working accurately, for the time being. Your Explorer will probably be running rough, or not at all. Most of them are the result of the cylinder head overtemperature protection mode. There are almost always noticeable symptoms related to P1299. The PCM can fully shut your Explorer’s engine down.The transmission will shift at different times, or enter limp mode.The combustion chamber acts as an air pump, and air cools the engine. In V6 and V8 applications, some cylinders are deactivated.The A/C is deactivated to save strain on the engine/cooling system.Here’s what can happen when this feature is activated: This process deactivates some cylinders in the block and cuts fuel to them. It will also activate something called cylinder head overtemperature protection. There will also likely be a warning in your vehicle’s information center. When the resistance decreases enough to indicate that the engine is overheating, P1299 will be stored in your Ford Explorer’s PCM memory and the check engine light will come on. It gets the reading directly from the metal in the head, and not the engine coolant, which allows the PCM to respond to a catastrophic cooling failure within enough time to (hopefully) save the engine from major damage. Your Explorer’s cylinder head temperature sensor (CHT) measures the heat in the cylinder head and increases resistance as the temperature decreases and decreases resistance as the temperature increases. P1299 Definition: Cylinder Head Overtemperature Protection Active Once it does, the temp gauge will be spiked, regardless of what the signal is from the engine coolant sensor (P1299 is determined by a cylinder head temp sensor that takes its reading directly from the metal of the head). It is known to appear BEFORE the temp gauge or warning light alerts you to an overheating condition in your Explorer. It indicates that your Ford Explorer has entered “Cylinder Head Overtemperature Protection”, which is a fail-safe mode designed to keep it from overheating so much that the engine gets damaged. P1299 is a very common Ford-only trouble code.
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