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P1906 Volkswagen Code - Charge Air Coolant Pump Relay Open Circuit/Short To Ground

Quick Answer

The P1906 code for Volkswagen indicates a problem with the Charge Air Coolant Pump Relay, specifically an open circuit or a short to ground. Common causes include Faulty charge air coolant pump relay, Wiring issues such as a short to ground or an open circuit, Corrosion or damage to the relay connector. 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
P1906 Volkswagen indicates Charge Air Coolant Pump Relay Open Circuit/Short To Ground.
Common causes
Common causes include Faulty charge air coolant pump relay, Wiring issues such as a short to ground or an open circuit, Corrosion or damage to the relay connector.
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 P1906 Volkswagen Description

The P1906 code for Volkswagen indicates a problem with the Charge Air Coolant Pump Relay, specifically an open circuit or a short to ground. The charge air coolant pump plays a crucial role in the vehicle's turbocharged system, as it helps to cool down the compressed air in the charge air cooler before it enters the engine. When the relay associated with this pump fails to function properly due to an open circuit or a short to ground, it can lead to a disruption in the cooling process, affecting the engine's performance and efficiency.

OBDII Code P1906 Volkswagen - Charge Air Coolant Pump Relay Open Circuit/Short To Ground
P1906 Volkswagen Code - Charge Air Coolant Pump Relay Open Circuit/Short To Ground

Common Causes of P1906 Volkswagen

  1. Faulty charge air coolant pump relay
  2. Wiring issues such as a short to ground or an open circuit
  3. Corrosion or damage to the relay connector
  4. Electrical system malfunctions
  5. Overheating of the charge air coolant pump relay

Symptoms of P1906 Volkswagen

  1. Engine misfires or rough idling
  2. Decreased acceleration and overall performance
  3. Check Engine Light illuminated on the dashboard
  4. Increased fuel consumption
  5. Turbocharger not functioning properly

How to Fix P1906 Volkswagen

  1. Diagnose the issue by using a diagnostic scanner to retrieve the trouble code and inspecting the charge air coolant pump relay and associated components.
  2. Test the relay for proper functionality and check for any wiring or connector issues.
  3. Replace the faulty charge air coolant pump relay if necessary and repair any damaged wiring or connectors.
  4. Clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.
  5. Perform a final inspection to confirm that the charge air coolant pump system is operating correctly.

Cost to Fix P1906 Volkswagen

The typical repair costs for addressing a P1906 code related to the Charge Air Coolant Pump Relay can range from $150 to $400, depending on the extent of the issue and the specific components that need to be replaced. This estimate includes the cost of the new relay, any necessary wiring repairs, and labor charges. As mentioned earlier, the actual cost may vary based on the location, make and model of the vehicle, and the labor rates of the auto repair shop. It's recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate.

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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 P1906 Volkswagen Code

1. What does the OBDII code P1906 mean on a Volkswagen?

P1906 indicates an issue with the charge air coolant pump relay, specifically an open circuit or short to ground, which may affect the operation of the charge air cooling system.

2. What are the common symptoms of code P1906 in a Volkswagen?

Symptoms may include reduced engine performance, increased intake air temperatures, illuminated check engine light, and possible engine overheating in severe cases.

3. What causes the P1906 code to appear on a Volkswagen?

Common causes include a faulty charge air coolant pump relay, damaged wiring or connections, or a failed charge air coolant pump itself.

4. Can I drive my Volkswagen with the P1906 code?

While it may be possible to drive, prolonged operation with this code can lead to decreased performance and potential engine damage due to overheating or detonation.

5. How can I diagnose the P1906 code on my Volkswagen?

Start by inspecting the charge air coolant pump relay, checking for damaged or corroded wiring, and testing the relay with a multimeter. Verify the pump's operation as well.

6. How do I fix the P1906 code on my Volkswagen?

Repairs may include replacing a faulty charge air coolant pump relay, repairing damaged wiring, or replacing the charge air coolant pump if it is not functioning properly.

7. What tools are needed to troubleshoot the P1906 code?

You’ll need an OBDII scanner, a multimeter, and possibly wiring diagrams specific to your Volkswagen model to diagnose and repair the issue.

8. What happens if the P1906 code is ignored?

Ignoring this code can lead to higher intake air temperatures, reduced fuel efficiency, and potential engine damage over time due to inadequate cooling.

9. How much does it cost to repair the P1906 issue in a Volkswagen?

Repair costs can vary depending on the root cause but may range from $50 for a new relay to several hundred dollars if the charge air coolant pump needs replacement.

10. Is the P1906 code specific to Volkswagen vehicles?

While P1906 is a generic OBDII code, its precise meaning and associated systems may differ between manufacturers. For Volkswagen, it pertains to the charge air coolant pump relay.

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