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P2064 Audi Code - Reductant/Regeneration Supply Control Circuit High

Quick Answer

The P2064 diagnostic trouble code for Audi indicates a problem with the Reductant/Regeneration Supply Control Circuit being too high. Common causes include Faulty Control Module: A malfunction in the control module responsible for managing the Reductant/Regeneration Supply Control Circuit could trigger this code, Wiring Issues: Damaged or corroded wiring connections related to the reductant system can cause communication errors and trigger the code, Sensor Malfunction: A faulty sensor that monitors the reductant fluid levels or the injection process could lead to this code being set. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2064 Audi indicates Reductant/Regeneration Supply Control Circuit High.
Common causes
Common causes include Faulty Control Module: A malfunction in the control module responsible for managing the Reductant/Regeneration Supply Control Circuit could trigger this code, Wiring Issues: Damaged or corroded wiring connections related to the reductant system can cause communication errors and trigger the code, Sensor Malfunction: A faulty sensor that monitors the reductant fluid levels or the injection process could lead to this code being set.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2064 Audi Description

The P2064 diagnostic trouble code for Audi indicates a problem with the Reductant/Regeneration Supply Control Circuit being too high. This code is related to the vehicle's emissions control system and specifically the system responsible for reducing harmful emissions from the exhaust. The Reductant system uses a special fluid (often called DEF or AdBlue) to neutralize harmful pollutants in the exhaust gas, converting them into less harmful substances.

OBDII Code P2064 Audi - Reductant/Regeneration Supply Control Circuit High
P2064 Audi Code - Reductant/Regeneration Supply Control Circuit High

Common Causes of P2064 Audi

  1. Faulty Control Module: A malfunction in the control module responsible for managing the Reductant/Regeneration Supply Control Circuit could trigger this code.
  2. Wiring Issues: Damaged or corroded wiring connections related to the reductant system can cause communication errors and trigger the code.
  3. Sensor Malfunction: A faulty sensor that monitors the reductant fluid levels or the injection process could lead to this code being set.
  4. Reductant Injector Problem: Issues with the reductant injector, such as clogs or malfunctions, can also trigger this diagnostic trouble code.

Symptoms of P2064 Audi

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine power or performance due to issues with the emissions control system.
  3. Poor Fuel Economy: A malfunction in the Reductant system can also lead to decreased fuel efficiency as the engine may not be running at optimal conditions.
  4. Increased Emissions: If the reductant system is not functioning properly, the vehicle may emit higher levels of harmful pollutants.

How to Fix P2064 Audi

  1. Diagnostic Scan: The first step in addressing this issue is to perform a diagnostic scan to confirm the P2064 code and assess the specific cause of the problem.
  2. Inspect Wiring and Connections: Check the wiring and connections related to the Reductant system for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test Sensors: Test the sensors involved in monitoring the reductant system to ensure they are functioning properly. Replace any faulty sensors.
  4. Check Reductant Injector: Inspect the reductant injector for any clogs or malfunctions. Clean or replace the injector if necessary.
  5. Clear Codes and Test Drive: After completing the repairs, clear the diagnostic trouble codes, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2064 Audi

The cost to repair the Reductant/Regeneration Supply Control Circuit High issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for this repair can range from $100 to $300, while the labor costs can range from $150 to $400. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the problem. It is recommended to consult with a qualified mechanic or dealership to get an accurate estimate for your particular vehicle.

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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 P2064 Audi Code

1. What does OBDII code P2064 mean on an Audi?

P2064 indicates a "Reductant/Regeneration Supply Control Circuit High," meaning the vehicle's system has detected an electrical issue in the circuit controlling the diesel exhaust fluid (DEF) or reductant supply.

2. What are common symptoms of code P2064 in an Audi?

Typical symptoms include the check engine light turning on, reduced engine performance, poor fuel economy, and possible warnings related to the emissions or DEF system.

3. What causes the P2064 code to appear in an Audi?

Common causes include a faulty reductant pump, damaged wiring or connectors in the reductant supply circuit, a malfunctioning control module, or issues with the reductant heating element.

4. Can driving with a P2064 code damage my Audi?

Yes, ignoring this code can lead to more severe emissions system issues, potential engine derating, or failure to meet emissions regulations, especially in diesel vehicles.

5. How do I diagnose the P2064 code in my Audi?

Diagnosis involves inspecting the reductant pump, wiring, and connectors for damage, using a multimeter to check for proper voltage, and testing the reductant control module for functionality.

6. Can a blown fuse cause the P2064 code in an Audi?

Yes, a blown fuse in the reductant supply circuit can cause the P2064 code by interrupting the electrical flow to the system.

7. Is replacing the reductant pump always necessary to fix P2064?

No, replacement is only necessary if the pump is confirmed to be faulty. The issue could also stem from wiring damage, a bad control module, or other electrical problems.

8. How much does it cost to repair a P2064 code on an Audi?

Repair costs vary depending on the problem. Replacing a reductant pump can cost $500–$1,000, while fixing wiring or connectors is usually less expensive.

9. How can I prevent the P2064 code from recurring in my Audi?

Regularly inspect and maintain the DEF system, ensure connectors and wiring are secure and undamaged, and address any emissions-related warnings promptly.

10. Can I clear the P2064 code without fixing the problem?

Clearing the code with a scan tool will reset the check engine light temporarily, but the issue will likely return if the underlying problem isn’t resolved.

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