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P0459 Audi Code - EVAP System Purge Control Solenoid High

Quick Answer

The P0459 diagnostic trouble code (DTC) for Audi vehicles refers to an issue with the EVAP (Evaporative Emission Control) System Purge Control Solenoid being detected as high. Common causes include Faulty Purge Control Solenoid: The most common cause of the P0459 code is a malfunctioning EVAP system purge control solenoid, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the purge control solenoid can trigger this code, ECM Malfunction: A malfunctioning Engine Control Module (ECM) can also cause the P0459 code to be set. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0459 Audi indicates EVAP System Purge Control Solenoid High.
Common causes
Common causes include Faulty Purge Control Solenoid: The most common cause of the P0459 code is a malfunctioning EVAP system purge control solenoid, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the purge control solenoid can trigger this code, ECM Malfunction: A malfunctioning Engine Control Module (ECM) can also cause the P0459 code to be set.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 19, 2024
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Code P0459 Audi Description

The P0459 diagnostic trouble code (DTC) for Audi vehicles refers to an issue with the EVAP (Evaporative Emission Control) System Purge Control Solenoid being detected as high. The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The purge control solenoid is a crucial component of this system, as it controls the flow of fuel vapors from the charcoal canister to the engine for combustion.

OBDII Code P0459 Audi - EVAP System Purge Control Solenoid High
P0459 Audi Code - EVAP System Purge Control Solenoid High

Common Causes of P0459 Audi

  1. Faulty Purge Control Solenoid: The most common cause of the P0459 code is a malfunctioning EVAP system purge control solenoid.
  2. Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the purge control solenoid can trigger this code.
  3. ECM Malfunction: A malfunctioning Engine Control Module (ECM) can also cause the P0459 code to be set.
  4. Vacuum Leaks: Any leaks in the vacuum lines connected to the EVAP system can disrupt the proper operation of the purge control solenoid.

Symptoms of P0459 Audi

  1. Check Engine Light: The most common symptom associated with the P0459 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Rough Idle: A malfunctioning EVAP system purge control solenoid can cause the engine to idle roughly or inconsistently.
  3. Decreased Fuel Efficiency: Since the EVAP system helps optimize fuel vapor management, a fault in the purge control solenoid can lead to decreased fuel efficiency.
  4. Strong Fuel Odor: A leak in the EVAP system caused by a faulty solenoid can result in a strong fuel odor inside and outside the vehicle.

How to Fix P0459 Audi

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the specific DTC and perform a visual inspection of the EVAP system components.
  2. Test the Purge Control Solenoid: Check the resistance of the purge control solenoid and test its functionality using a multimeter.
  3. Inspect Wiring: Thoroughly inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  4. Replace Purge Control Solenoid: If the solenoid is found to be faulty, replace it with a new OEM or high-quality aftermarket part.
  5. Clear Codes and Test: Clear the DTC using the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0459 Audi

The typical repair costs for addressing a P0459 code in an Audi vehicle can range from $150 to $400, including parts and labor. However, it's important to note that the actual cost can vary based on factors such as the specific model of the Audi, the location of the repair shop, and the rates charged for diagnosis and labor. It's recommended to obtain quotes from multiple reputable auto repair shops to get a more accurate estimate for the repair.

When is the Code Detected?

The Engine Control Module (ECM) has detected a high voltage on the canister purge solenoid with the driver commanded on

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0459 Audi Code

1. What are the common symptoms of OBDII code P0459 in an Audi related to the EVAP system purge control solenoid high?

The common symptoms include the check engine light illuminating on the dashboard, decreased fuel efficiency, rough idling, and potentially a strong smell of fuel.

2. What are the possible causes of OBDII code P0459 in an Audi?

The code P0459 typically indicates a malfunction in the EVAP system purge control solenoid circuit. Possible causes include a faulty purge control solenoid, wiring issues, or a damaged EVAP system.

3. How serious is OBDII code P0459 in an Audi, and can I continue driving the vehicle with this code?

While the code P0459 itself may not cause immediate harm to the vehicle, it is important to address the underlying issue promptly to prevent potential damage to the EVAP system or decreased fuel efficiency. It is generally safe to drive the vehicle to a repair shop for diagnosis and repair.

4. How can I diagnose OBDII code P0459 in my Audi related to the EVAP system purge control solenoid high?

Diagnosing OBDII code P0459 typically involves using an OBDII scanner to read the code, followed by inspecting the purge control solenoid, checking the wiring for any damage, and testing the EVAP system components for proper functioning.

5. What are some repair tips for fixing OBDII code P0459 in an Audi?

Repairing OBDII code P0459 often involves replacing the faulty EVAP system purge control solenoid, repairing any damaged wiring, or addressing issues with the EVAP system components. It is recommended to follow the manufacturer's repair procedures or seek assistance from a professional mechanic.

6. Can I reset OBDII code P0459 in my Audi without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is not recommended to reset the code without addressing the root cause. The check engine light may temporarily turn off, but the issue will likely reoccur, leading to potential long-term problems.

7. How much does it cost to repair OBDII code P0459 in an Audi at a repair shop?

The cost of repairing OBDII code P0459 can vary depending on the specific issue, labor rates, and parts needed. It is advisable to obtain quotes from reputable repair shops to determine the estimated cost of the repair.

8. Are there any preventive maintenance measures I can take to avoid OBDII code P0459 in my Audi?

To prevent OBDII code P0459, it is recommended to regularly inspect the EVAP system components, such as the purge control solenoid, for any signs of wear or damage. Additionally, ensuring proper maintenance of the vehicle can help prevent issues with the EVAP system.

9. Can a DIY enthusiast fix OBDII code P0459 in an Audi, or is it best left to a professional mechanic?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P0459, it is generally recommended to seek assistance from a professional mechanic. The EVAP system is a crucial component of the vehicle, and improper repairs can lead to further issues down the line.

10. How long does it typically take to repair OBDII code P0459 in an Audi?

The repair time for OBDII code P0459 can vary depending on the extent of the issue, availability of parts, and the skill level of the mechanic. In most cases, the repair can be completed within a few hours to a day, but it is advisable to consult with the repair shop for a more accurate estimate.

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