BMW P0599 Code:Thermostat Heater Control Circuit High
As a car owner, it’s essential to be aware of the different fault codes that may appear on your vehicle’s dashboard. One of the most common codes that BMW drivers encounter is the P0599 code. This code indicates a problem with the thermostat heater control circuit, which can cause various issues with your car’s performance. In this article, we’ll discuss the meaning, causes, symptoms, and fixes for the BMW P0599 code. Whether you’re a DIY enthusiast or seeking professional help, this guide will provide you with the necessary information to diagnose and repair your vehicle.
What Does BMW P0599 Code Mean?
The BMW P0599 code refers to a fault in the thermostat heater control circuit, indicating that the circuit is reading a high voltage. This code is commonly found in BMW vehicles and can cause issues with the engine’s performance and fuel efficiency. The thermostat heater control circuit is responsible for regulating the engine’s temperature, ensuring that it stays within the optimal range. When the circuit is reading a high voltage, it can cause the engine to overheat or run too hot, leading to potential damage. It is important to diagnose and fix this issue promptly to avoid further damage to the vehicle.
Signs and Symptoms of BMW P0599 Code
The P0599 fault code in BMW vehicles is related to the thermostat heater control circuit. When this code appears, it indicates that there is a problem with the thermostat heater control circuit, which can cause several symptoms. Here are some of the signs and symptoms of the BMW P0599 code:
- Check Engine Light: The most common symptom of the P0599 code is the illumination of the check engine light on the dashboard. This light indicates that there is a problem with the engine or emissions system.
- Engine Overheating: Another symptom of the P0599 code is engine overheating. This happens when the thermostat heater control circuit fails to regulate the engine’s temperature, causing it to overheat.
- Poor Fuel Economy: A faulty thermostat heater control circuit can also cause poor fuel economy. This happens because the engine is not running at its optimal temperature, which can lead to increased fuel consumption.
- Engine Stalling: In some cases, the P0599 code can cause the engine to stall or shut off completely. This happens when the engine overheats or when the thermostat heater control circuit fails to regulate the engine’s temperature.
- Reduced Engine Performance: A faulty thermostat heater control circuit can also cause reduced engine performance. This happens because the engine is not running at its optimal temperature, which can lead to decreased power and acceleration.
If you experience any of these symptoms, it is important to have your BMW vehicle diagnosed and repaired by a qualified mechanic. Ignoring the P0599 code can lead to further damage to your engine and other components, which can be costly to repair.
Possible Causes of BMW P0599 Code
The P0599 fault code in BMW vehicles indicates a problem with the thermostat heater control circuit. This code is triggered when the engine control module (ECM) detects a high voltage in the circuit. Here are some of the possible causes of the P0599 code:
- Faulty thermostat: A malfunctioning thermostat can cause the engine to overheat or not reach the optimal operating temperature. This can trigger the P0599 code.
- Short circuit or open circuit: A short circuit or open circuit in the thermostat heater control circuit can cause the ECM to detect a high voltage and trigger the P0599 code.
- Failed thermostat heater: The thermostat heater is responsible for regulating the temperature of the engine coolant. If it fails, it can cause the engine to overheat or not reach the optimal operating temperature, triggering the P0599 code.
- Wiring issues: Damaged or corroded wiring in the thermostat heater control circuit can cause the ECM to detect a high voltage and trigger the P0599 code.
- Failed ECM: In rare cases, a failed ECM can cause the P0599 code to appear.
It is important to note that the P0599 code can also be triggered by other issues, such as a faulty engine coolant temperature sensor or a malfunctioning water pump. Therefore, it is recommended to have a professional mechanic diagnose the issue to determine the exact cause of the code. Once the cause is identified, the mechanic can perform the necessary repairs to fix the issue and clear the code.
Fixes for BMW P0599 Code
The P0599 fault code in BMW vehicles indicates a problem with the thermostat heater control circuit. Here are some possible fixes for this issue:
- Replace the thermostat: A faulty thermostat can cause the heater control circuit to malfunction. Replacing the thermostat may solve the problem.
- Check the wiring: The wiring in the heater control circuit may be damaged or disconnected. Inspect the wiring and repair or replace any damaged or disconnected wires.
- Replace the heater control valve: The heater control valve may be faulty and need to be replaced. This valve controls the flow of coolant to the heater core, which in turn controls the temperature inside the vehicle.
- Check the coolant level: Low coolant levels can cause the heater control circuit to malfunction. Check the coolant level and add more if necessary.
- Replace the engine coolant temperature sensor: The engine coolant temperature sensor may be faulty and need to be replaced. This sensor monitors the temperature of the engine coolant and sends signals to the engine control module.
- Check the engine control module: The engine control module may be malfunctioning and need to be replaced. This module controls various functions in the vehicle, including the heater control circuit.
It is important to note that diagnosing and fixing the P0599 fault code can be complex and may require the expertise of a professional mechanic or repair shop that specializes in BMW vehicles. If you are experiencing this issue, it is recommended to seek expert help to ensure proper diagnosis and repair.
How Much Will It Take to Fix BMW P0599 Code?
The cost of fixing the BMW P0599 code can vary depending on the severity of the issue and the type of repair needed. In general, the cost can range from $100 to $500 or more. The cost can be higher if the problem requires replacing the thermostat or other parts of the engine.
The first step in fixing the P0599 code is to diagnose the issue. This can be done by using a diagnostic tool to read the code and identify the problem. Once the issue is identified, the mechanic can determine the best course of action to fix the problem.
The most common fix for the P0599 code is to replace the thermostat. This can cost anywhere from $50 to $200 depending on the make and model of the vehicle. If the issue is more severe, such as a damaged wiring harness or a faulty control module, the cost can be higher.
In any case, it is important to have the issue fixed as soon as possible to prevent further damage to the engine and ensure the safety of the vehicle. It is recommended to consult with a certified mechanic or repair shop that specializes in BMW vehicles to diagnose and fix the issue.
Possible Causes and Fixes of Code
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Faulty Thermostat | Replace the thermostat | $200-$500 |
| Wiring Issues | Repair or replace damaged wiring | $100-$300 |
| Faulty Engine Coolant Temperature Sensor | Replace the sensor | $100-$300 |
| Faulty Engine Control Module (ECM) | Replace the ECM | $500-$1000 |
Preventing BMW P0599 Code
The BMW P0599 Code is a fault code that indicates a problem with the thermostat heater control circuit. To prevent this code from occurring, there are several preventive measures that you can take. Here are some of the most effective ways to prevent the BMW P0599 Code:
- Regular Maintenance: Regular maintenance is essential to keep your BMW in good condition. Make sure to follow the manufacturer’s recommended maintenance schedule, which includes replacing the thermostat and other components as needed.
- Use High-Quality Parts: When replacing parts in your BMW, make sure to use high-quality parts that are designed for your specific model. Using low-quality or aftermarket parts can cause problems with the thermostat heater control circuit and other systems in your vehicle.
- Check the Wiring: The wiring in your BMW can become damaged or corroded over time, which can cause problems with the thermostat heater control circuit. Make sure to check the wiring regularly and replace any damaged or corroded wires as needed.
- Keep Your Engine Cool: Overheating can cause problems with the thermostat heater control circuit and other systems in your BMW. Make sure to keep your engine cool by checking the coolant level regularly and replacing the coolant as needed.
- Avoid Extreme Temperatures: Extreme temperatures can cause problems with the thermostat heater control circuit and other systems in your BMW. Avoid driving in extreme heat or cold whenever possible.
By following these preventive measures, you can reduce the risk of the BMW P0599 Code occurring in your vehicle. However, if you do experience this code, it is important to have your BMW diagnosed and repaired by a qualified mechanic or repair shop that specializes in BMW vehicles. They can help you identify the root cause of the problem and provide the necessary repairs to get your BMW back on the road.
How Serious is the BMW P0599 Code?
The BMW P0599 code is a fault code that indicates a problem with the thermostat heater control circuit. This code is not a critical issue, but it can cause some problems with the vehicle’s performance and fuel efficiency. The thermostat heater control circuit is responsible for regulating the engine’s temperature, and if it is not functioning correctly, it can cause the engine to overheat or run too cold.
Some of the symptoms of the BMW P0599 code include the check engine light coming on, reduced fuel efficiency, and poor engine performance. If left untreated, this code can cause damage to the engine and other components of the vehicle. It is essential to have the issue diagnosed and repaired as soon as possible to prevent further damage and ensure the vehicle’s optimal performance.
The causes of the BMW P0599 code can vary, but some common reasons include a faulty thermostat, damaged wiring, or a malfunctioning thermostat heater control circuit. A qualified mechanic can diagnose the issue and provide the necessary repairs to fix the problem.
In conclusion, while the BMW P0599 code is not a severe issue, it can cause problems with the vehicle’s performance and fuel efficiency. It is crucial to have the issue diagnosed and repaired promptly to prevent further damage and ensure the vehicle’s optimal performance.
Can You Still Drive with the BMW P0599 Code?
If your BMW is showing the P0599 code, it means that there is an issue with the thermostat heater control circuit. While this may not seem like a major problem, it is important to address it as soon as possible to avoid further damage to your vehicle.
Driving with the P0599 code can cause your engine to overheat, which can lead to serious engine damage and even engine failure. Additionally, your vehicle’s performance may be affected, and you may experience reduced fuel efficiency and power.
It is recommended that you do not drive your BMW with the P0599 code and have it diagnosed and repaired by a qualified mechanic as soon as possible. Continuing to drive with the code can cause further damage to your vehicle and result in costly repairs.
If you are unsure about the severity of the issue or need help diagnosing and repairing your BMW, it is best to seek the help of a professional mechanic or repair shop that specializes in BMW vehicles.
Conclusion
If you are experiencing the P0599 fault code in your BMW vehicle, it is important to address the issue promptly to avoid further damage to your engine. The code indicates a problem with the thermostat heater control circuit, which can cause your engine to overheat or run inefficiently. Possible causes of the code include a faulty thermostat, damaged wiring, or a malfunctioning control module. To fix the issue, it is recommended to seek the help of a qualified mechanic or repair shop that specializes in BMW vehicles. They can diagnose the problem and provide the necessary repairs to get your vehicle running smoothly again.
FAQ
What is the BMW P0599 code?
The BMW P0599 code refers to a fault in the thermostat heater control circuit, indicating that the circuit is reading a high voltage signal.
What are the symptoms of the BMW P0599 code?
The symptoms of the BMW P0599 code may include the engine running hotter or cooler than normal, poor fuel economy, and the check engine light turning on.
What are the possible causes of the BMW P0599 code?
The possible causes of the BMW P0599 code may include a faulty thermostat, a malfunctioning thermostat heater control circuit, a damaged engine coolant temperature sensor, or a wiring issue.
How is the BMW P0599 code diagnosed?
The BMW P0599 code can be diagnosed using an OBD-II scanner, which will read the fault code and provide information on the specific circuit or component that is causing the issue.
Can I still drive my BMW with the P0599 code?
It is not recommended to drive your BMW with the P0599 code, as it can cause damage to the engine and reduce fuel efficiency. It is best to have the issue diagnosed and repaired as soon as possible.
How is the BMW P0599 code fixed?
The BMW P0599 code can be fixed by replacing the faulty thermostat, repairing or replacing the thermostat heater control circuit, replacing the engine coolant temperature sensor, or repairing any wiring issues.
Do I need to take my BMW to a specialist mechanic for the P0599 code?
It is recommended to take your BMW to a specialist mechanic or repair shop that has experience working with BMW vehicles, as they will have the knowledge and tools necessary to diagnose and repair the issue correctly.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.