BMW P0459 Code:Evaporative Emission Purge Solenoid Control Circuit High Voltage
As a car owner, it can be frustrating to see a check engine light pop up on your dashboard. One of the most common reasons for this is a diagnostic trouble code (DTC) related to the evaporative emission control system. In BMW vehicles, the P0459 code is one such DTC that can cause concern for drivers. In this article, we will explore the meaning, causes, symptoms, and fixes for the BMW P0459 code, providing you with the information you need to diagnose and resolve the issue. So, let’s dive in and find solutions to get your BMW back on the road.
What Does BMW P0459 Code Mean?
The BMW P0459 code is a diagnostic trouble code (DTC) that indicates a problem with the evaporative emission control system. Specifically, it refers to the evaporative emission purge solenoid control circuit having high voltage. This means that the engine control module (ECM) has detected an abnormal voltage reading from the purge solenoid circuit, which is responsible for controlling the flow of fuel vapors from the fuel tank to the engine. When this code appears, it can cause the check engine light to illuminate and may result in decreased fuel efficiency and performance. It is important to address this issue promptly to prevent further damage to the vehicle and ensure it is running efficiently.
Signs and Symptoms of BMW P0459 Code
When the BMW P0459 code appears, it indicates a problem with the evaporative emission control system. This system is responsible for controlling the release of fuel vapors into the atmosphere. If there is an issue with this system, it can cause several symptoms that can affect the performance of your BMW. Here are some of the signs and symptoms of the BMW P0459 code:
- Check Engine Light: The most common symptom of the P0459 code is the illumination of the check engine light on the dashboard. This light indicates that there is a problem with the vehicle’s emissions system.
- Reduced Fuel Efficiency: If the evaporative emission control system is not working correctly, it can cause a reduction in fuel efficiency. This is because the fuel vapors are not being properly controlled, leading to wastage of fuel.
- Strong Fuel Odor: Another symptom of the P0459 code is a strong fuel odor coming from the vehicle. This is because the fuel vapors are not being properly contained, leading to a strong smell of gasoline.
- Difficulty Starting the Engine: If the evaporative emission control system is not working correctly, it can cause difficulty starting the engine. This is because the fuel vapors are not being properly controlled, leading to a flooded engine.
- Failed Emissions Test: If the P0459 code is not resolved, it can cause the vehicle to fail an emissions test. This can lead to fines and penalties, as well as the inability to register the vehicle.
If you notice any of these symptoms in your BMW, it is essential to have the vehicle inspected by a qualified mechanic. They can diagnose the problem and provide the necessary repairs to resolve the P0459 code issue. Ignoring the symptoms can lead to further damage to the vehicle and increased repair costs.
Possible Causes of BMW P0459 Code
The BMW P0459 code is related to the evaporative emission control system, which is responsible for reducing the amount of harmful gases released into the atmosphere. When this code appears, it means that there is a problem with the purge solenoid control circuit, which is responsible for controlling the flow of fuel vapors from the fuel tank to the engine. Here are some of the possible causes of the BMW P0459 code:
- Faulty purge solenoid valve: The purge solenoid valve is responsible for controlling the flow of fuel vapors from the fuel tank to the engine. If this valve is faulty, it can cause the P0459 code to appear.
- Wiring issues: The wiring that connects the purge solenoid valve to the engine control module (ECM) can become damaged or corroded over time, which can cause the P0459 code to appear.
- ECM issues: The ECM is responsible for controlling the purge solenoid valve. If there is a problem with the ECM, it can cause the P0459 code to appear.
- Leaking fuel cap: A leaking fuel cap can cause the fuel vapors to escape from the fuel tank, which can trigger the P0459 code.
- Cracked or damaged fuel lines: If the fuel lines that connect the fuel tank to the engine are cracked or damaged, it can cause the fuel vapors to escape, which can trigger the P0459 code.
- Fuel tank issues: If there is a problem with the fuel tank, such as a leak or a damaged vent, it can cause the P0459 code to appear.
In conclusion, the BMW P0459 code can be caused by a variety of issues related to the evaporative emission control system. It is important to have the issue diagnosed and repaired as soon as possible to prevent further damage to the vehicle and to reduce harmful emissions.
Fixes for BMW P0459 Code
The P0459 code in BMW vehicles is related to the evaporative emission control system, which is responsible for reducing harmful emissions from the vehicle. If you have encountered this code, it is important to address it promptly to avoid further damage to your car. Here are some possible fixes for the P0459 code:
1. Check the Purge Solenoid Valve
The purge solenoid valve is responsible for controlling the flow of fuel vapors from the fuel tank to the engine. If it is malfunctioning, it can cause the P0459 code to appear. Check the valve for any signs of damage or wear and replace it if necessary.
2. Inspect the Wiring and Connectors
Faulty wiring or connectors can also cause the P0459 code to appear. Check the wiring and connectors for any signs of damage or corrosion and repair or replace them as needed.
3. Replace the Charcoal Canister
The charcoal canister is an important component of the evaporative emission control system. If it is damaged or clogged, it can cause the P0459 code to appear. Replace the canister if necessary.
4. Check the Fuel Cap
A loose or damaged fuel cap can also cause the P0459 code to appear. Check the fuel cap for any signs of damage or wear and replace it if necessary.
5. Reset the Engine Control Module (ECM)
Sometimes, the P0459 code can be triggered by a temporary glitch in the ECM. Resetting the ECM can sometimes resolve the issue. However, if the code reappears, it is important to address the underlying issue.
In conclusion, the P0459 code in BMW vehicles can be caused by a variety of issues related to the evaporative emission control system. It is important to address the issue promptly to avoid further damage to your car. The fixes for the code include checking the purge solenoid valve, inspecting the wiring and connectors, replacing the charcoal canister, checking the fuel cap, and resetting the ECM. If you are unsure about how to address the issue, it is recommended to seek the help of a qualified mechanic.
How Much Will It Take to Fix BMW P0459 Code?
If you are facing the BMW P0459 code issue, you might be wondering how much it will cost to fix it. The cost of fixing the P0459 code can vary depending on the severity of the problem and the type of repair required.
The first step to fixing the P0459 code is to diagnose the problem accurately. This can be done by taking your BMW to a certified mechanic or repair shop that specializes in BMW vehicles. They will use specialized diagnostic tools to identify the root cause of the issue.
Once the problem is identified, the cost of fixing the P0459 code will depend on the type of repair required. In some cases, it may be a simple fix, such as replacing a faulty purge solenoid valve or repairing a damaged wiring harness. However, in more severe cases, it may require replacing the entire evaporative emission control system, which can be expensive.
Overall, the cost of fixing the BMW P0459 code can range from a few hundred dollars to over a thousand dollars, depending on the severity of the problem and the type of repair required. It is always recommended to get a quote from a certified mechanic or repair shop before proceeding with any repairs.
Possible Causes and Fixes of Code P0459
| Possible Cause | Fix | Cost to Fix |
|---|---|---|
| Faulty Evaporative Emission Purge Solenoid | Replace the solenoid | $100-$300 |
| Wiring Issues | Repair or replace damaged wiring | $100-$500 |
| Faulty PCM | Replace the PCM | $500-$1000 |
| Loose or Damaged Gas Cap | Tighten or replace the gas cap | $10-$50 |
| Leaking Fuel Tank or Fuel Lines | Repair or replace the fuel tank or lines | $500-$1000 |
Preventing BMW P0459 Code: Tips and Tricks
The BMW P0459 code is a common issue that many BMW owners face. It is related to the evaporative emission control system and can cause various problems if not addressed promptly. However, there are several preventive measures that you can take to avoid this code from appearing in your BMW. Here are some tips and tricks to help you prevent the BMW P0459 code:
1. Regular Maintenance: Regular maintenance is crucial to keep your BMW in good condition. It is recommended to follow the manufacturer’s maintenance schedule and get your car serviced regularly. This will help you identify any potential issues before they become major problems.
2. Check Fuel Cap: The fuel cap is an essential component of the evaporative emission control system. A loose or damaged fuel cap can cause the BMW P0459 code to appear. Therefore, it is essential to check the fuel cap regularly and ensure that it is tight and in good condition.
3. Avoid Overfilling: Overfilling the fuel tank can cause the evaporative emission control system to malfunction. Therefore, it is recommended to avoid overfilling the fuel tank and stop filling the tank once the nozzle clicks off.
4. Use High-Quality Fuel: Using low-quality fuel can cause various problems, including the BMW P0459 code. Therefore, it is recommended to use high-quality fuel that meets the manufacturer’s specifications.
5. Drive Sensibly: Aggressive driving can cause various problems, including the BMW P0459 code. Therefore, it is recommended to drive sensibly and avoid sudden acceleration or braking.
6. Address Any Issues Promptly: If you notice any issues with your BMW, it is recommended to address them promptly. Ignoring the problem can cause it to become more severe and lead to the BMW P0459 code.
How Serious is the BMW P0459 Code?
The BMW P0459 code is a serious issue that needs to be addressed immediately. This code indicates a problem with the evaporative emission control system, which is responsible for reducing harmful emissions from the vehicle. If left untreated, this issue can lead to increased emissions, reduced fuel efficiency, and even engine damage.
One of the main causes of the P0459 code is a malfunctioning evaporative emission purge solenoid control circuit. This component is responsible for controlling the flow of fuel vapors from the fuel tank to the engine. When the circuit is not functioning properly, it can cause the engine to run poorly and emit more pollutants into the environment.
Some of the symptoms of the P0459 code include a check engine light, rough idling, decreased fuel efficiency, and difficulty starting the engine. If you experience any of these symptoms, it is important to have your vehicle inspected by a qualified mechanic as soon as possible.
To fix the P0459 code, the faulty component must be identified and replaced. This may involve replacing the evaporative emission purge solenoid control circuit, repairing damaged wiring, or replacing the fuel tank pressure sensor. It is important to have this issue resolved promptly to prevent further damage to your vehicle and to reduce harmful emissions.
Can You Still Drive with the BMW P0459 Code?
If your BMW has triggered the P0459 code, it means that there is a problem with the evaporative emission control system. This system is responsible for reducing the amount of harmful gases that are released into the atmosphere. While it is not recommended to drive with a faulty emission control system, you may still be able to drive your BMW with the P0459 code.
However, it is important to note that driving with a faulty emission control system can cause damage to your vehicle and harm the environment. The P0459 code indicates that there is a high voltage in the evaporative emission purge solenoid control circuit, which can cause the solenoid to malfunction. This can lead to increased emissions and reduced fuel efficiency.
If you choose to drive with the P0459 code, it is important to have your BMW inspected and repaired as soon as possible. Ignoring the issue can lead to more serious problems and costly repairs down the line. It is recommended to take your BMW to a certified mechanic who can diagnose and fix the issue.
Conclusion
Dealing with the BMW P0459 code can be frustrating, but understanding its meaning, causes, symptoms, and fixes can help you resolve the issue. The code is related to the evaporative emission control system, and it can be caused by a faulty purge solenoid control circuit or other issues. Symptoms may include a check engine light, rough idle, and poor fuel economy. To fix the problem, you may need to replace the purge solenoid, repair wiring or connectors, or perform other repairs. It’s important to have a qualified BMW mechanic diagnose and repair the issue to ensure your vehicle is running smoothly and efficiently.
FAQ
What is the meaning of BMW P0459 code?
The BMW P0459 code refers to the evaporative emission purge solenoid control circuit high voltage. It means that there is a problem with the control circuit of the purge solenoid valve, which is responsible for controlling the flow of fuel vapors from the fuel tank to the engine.
What are the possible causes of BMW P0459 code?
The possible causes of BMW P0459 code include a faulty purge solenoid valve, damaged wiring or connectors in the purge solenoid circuit, a malfunctioning powertrain control module (PCM), or a leak in the evaporative emission control system.
What are the symptoms of BMW P0459 code?
The symptoms of BMW P0459 code may include the check engine light turning on, decreased fuel efficiency, rough idling, and difficulty starting the engine.
How is BMW P0459 code diagnosed?
Diagnosing BMW P0459 code involves using an OBD-II scanner to retrieve the code and then performing a visual inspection of the purge solenoid valve and its circuit. The mechanic may also conduct a smoke test to detect any leaks in the evaporative emission control system.
Can I still drive my BMW with P0459 code?
It is not recommended to drive your BMW with P0459 code as it can lead to decreased fuel efficiency and potential damage to the engine. It is best to have the issue diagnosed and repaired as soon as possible.
How is BMW P0459 code fixed?
Fixing BMW P0459 code involves replacing the faulty purge solenoid valve, repairing any damaged wiring or connectors in the circuit, or replacing the powertrain control module (PCM) if necessary. The mechanic may also need to repair any leaks in the evaporative emission control system.
Where can I find a BMW repair shop or mechanic to fix P0459 code?
You can find a BMW repair shop or mechanic to fix P0459 code by searching online directories or using search engines. You can also ask for recommendations from friends or family members who own BMW vehicles.
Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.