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P1299

Cylinder Head Overtemperature Protection Active

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By
KBB Service Advisor
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Reviewed by
Gary Hardesty

What Is the P1299 Code?

Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help

This error code indicates that there’s an issue with the heat in your engine. It may be defined as “Cylinder Head Overtemperature Protection Active,” as “Cylinder Head Temperature Sensor Detected Engine Overheating Condition,” or as a similar phrase. All of these phrases indicate that there’s an issue with the engine’s heat detection, showing that the temperature is too high.

More About the P1299 Code

One of the reasons that it’s important to check for the definition of the code is because this code may have different meanings depending on your manufacturer. Citroen, Ford, Land Rover, Lincoln, Mazda, Mercury, and Peugeot all indicate this code as a temperature concern. However, there are other definitions, which you may see as well:

  • Chrysler, Dodge, Eagle, Jeep, Plymouth, Ram: Manifold absolute pressure (MAP) sensor/throttle position (TP) sensor
  • Honda, Isuzu: Throttle position (TP) motor – forced engine shut down mode
  • Acura: Electronic Throttle Control Forced Engine Shut Down Mode
  • Audi: Fuel metering solenoid – circuit malfunction
  • Volkswagen: Fuel metering solenoid – circuit malfunction

Make sure you know why your engine is throwing the P1299 code before trying to fix it.

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What Are the Symptoms of a P1299 Code?

It’s very common to see no symptoms beyond simply a check engine light. If you do notice symptoms, then they may be very slight, such as the engine taking a long time to start, general engine performance issues, and a lower fuel efficiency. However, as the problem continues, especially if the temperature gets hotter, you might notice the vehicle entering limp mode or even the engine shutting down in extreme cases.

What Are Some Causes of a P1299 Code?

There are many reasons that you might experience code P1299; it doesn’t happen due to any specific cause but instead just because the temperature is very high. The list of causes of engine overheating is extremely extensive, so you might have this problem due to lack of engine coolant, insufficient airflow over and through your radiator, defective thermostats or cylinder head temperature sensors, issues with wiring and connectors, open circuits, water pump problems, or even exceeding your towing or load carrying capacity.

How Serious Is the P1299 Code?

Typically, this code will indicate a very serious problem that you should get fixed as soon as possible because the problem could eventually extend into something where your engine is actively sustaining damage. Even if the problem doesn’t get that bad, low levels of overheating over a long period of time can still negatively impact your car’s health.

Can I Still Drive with a P1299 Code?

Although the issue with the P1299 code is that the engine is too hot, the actual level of overheating will depend on the car. If the sensors read as extremely hot, the engine may shut down altogether, and you may not be able to start the engine again until you get it looked at. This is why it’s a good idea to get your car to an expert as soon as you start noticing these problems.

How Easy Is It to Diagnose a P1299 Code?

There are many, many reasons why you might be experiencing engine overheating. That means trying to figure out the problem yourself can be very difficult. If it’s something very simple, such as a lack of engine coolant or something stuck in the engine, then you might be able to do it yourself, even as a beginner. However, if it’s any more complex than this, it’s a good idea to get to an expert instead.

How Difficult Is It to Inspect a P1299 Code?

The inspection process can be very difficult for a P1299 code simply because of all the reasons that this issue can arise. Although it can be very simple if the problem is more apparent, a more difficult-to-discover problem can have an equally difficult inspection process. If you’re in any way uncertain about whether or not you can fix the problem, you should instead talk to an expert to learn more about what’s going on and how they can fix it.

Need Additional Help with Your P1299 Code?

This code can negatively impact your car’s health over just a short period of time. If you’re experiencing this code or you’re seeing any of the symptoms associated with it, then it’s best to bring your car in to an expert, especially if you’re unable to fix it with any of the simple fixes like refilling your car’s coolant.

If you want to find repair shops near you, then Kelley has a list available. This can make it easier to find a local expert to help you fix the problem.

If you want to learn more about diagnostic codes, especially if your engine is throwing more than just this code, then you can use the OBD-II database from KBB to learn more in general.

P1299 Q&A

Common Error Codes

P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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