Engine-Codes.com
Engine-Codes – Volkswagen – P1905 Volkswagen

P1905 Volkswagen Code - Charge Air Coolant Pump Relay Short To Positive

Quick Answer

The P1905 diagnostic trouble code for Volkswagen vehicles indicates a Charge Air Coolant Pump Relay Short To Positive. Common causes include Faulty charge air coolant pump relay, Wiring or electrical connection issues in the relay circuit, Short circuit in the relay wiring. 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
P1905 Volkswagen indicates Charge Air Coolant Pump Relay Short To Positive.
Common causes
Common causes include Faulty charge air coolant pump relay, Wiring or electrical connection issues in the relay circuit, Short circuit in the relay wiring.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1905 Volkswagen Description

The P1905 diagnostic trouble code for Volkswagen vehicles indicates a Charge Air Coolant Pump Relay Short To Positive. This means that there is a malfunction in the relay responsible for controlling the charge air coolant pump, leading to a short circuit with a positive voltage. The charge air coolant pump plays a crucial role in maintaining optimal operating temperatures for the turbocharged engine by circulating coolant through the charge air cooler. When this relay malfunctions, it can disrupt the cooling process, leading to potential overheating issues and decreased engine performance.

OBDII Code P1905 Volkswagen - Charge Air Coolant Pump Relay Short To Positive
P1905 Volkswagen Code - Charge Air Coolant Pump Relay Short To Positive

Common Causes of P1905 Volkswagen

  1. Faulty charge air coolant pump relay
  2. Wiring or electrical connection issues in the relay circuit
  3. Short circuit in the relay wiring
  4. ECM malfunction or communication error
  5. Faulty charge air coolant pump

Symptoms of P1905 Volkswagen

  1. Check Engine Light illuminated on the dashboard
  2. Reduced engine performance and power
  3. Engine overheating or temperature fluctuations
  4. Limp mode activation
  5. Potential coolant leaks or overheating issues

How to Fix P1905 Volkswagen

  1. Begin by diagnosing the root cause of the issue using a diagnostic scanner to retrieve the specific fault code and pinpoint the faulty component.
  2. Inspect the charge air coolant pump relay, wiring, and connections for any visible damage or corrosion. Replace any damaged components as necessary.
  3. Test the charge air coolant pump relay using a multimeter to ensure it is functioning correctly and providing the appropriate voltage signals.
  4. If the relay is found to be faulty, replace it with a new OEM or high-quality aftermarket part to ensure proper functionality.
  5. Clear the fault code from the ECM memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1905 Volkswagen

The cost of repairing a charge air coolant pump relay short to positive issue can vary depending on the specific vehicle model, the extent of the damage, and the labor rates at the auto repair shop. Typically, the cost of a new charge air coolant pump relay can range from $50 to $150, while the labor cost for diagnosis and repair can range from $100 to $300. Therefore, the total repair cost can be estimated to range from $150 to $450. It is recommended to contact local auto repair shops for accurate pricing information based on your vehicle's specifications.

Need more information about the P1905 Volkswagen code?

Need more information on how to fix the P1905 Volkswagen code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1905 Volkswagen code diagnosed by a professional: Find a repair shop in your area

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 P1905 Volkswagen Code

1. What does the OBDII code P1905 mean on a Volkswagen?

P1905 indicates a "Charge Air Coolant Pump Relay Short To Positive," meaning there’s an electrical issue with the relay or circuit controlling the charge air coolant pump.

2. What are the common symptoms of P1905 in a Volkswagen?

Symptoms include engine overheating, reduced engine performance, possible limp mode, and the Check Engine Light turning on.

3. What causes the P1905 code to appear?

Common causes include a faulty charge air coolant pump relay, damaged wiring or connectors, or a short circuit to the positive voltage.

4. How can I diagnose the P1905 code on my Volkswagen?

Start by checking the charge air coolant pump relay and its wiring for damage, test the relay with a multimeter, and inspect for short circuits or corrosion.

5. Can I drive my Volkswagen with a P1905 code?

Driving with this code is not recommended, as it may lead to engine overheating or reduced engine performance, potentially causing further damage.

6. How do I fix the P1905 code in a Volkswagen?

Repairs may include replacing the charge air coolant pump relay, repairing damaged wiring, or cleaning corroded electrical connectors.

7. How much does it cost to repair a P1905 code on a Volkswagen?

Repair costs can vary but typically range from $100 to $300, depending on whether the issue is with the relay, wiring, or other components.

8. Can a faulty charge air coolant pump cause a P1905 code?

While the code specifically refers to the relay, a malfunctioning charge air coolant pump could indirectly contribute to the issue and should also be inspected.

9. Will clearing the P1905 code fix the problem?

Clearing the code without addressing the underlying issue will not fix the problem; the code will likely return if the fault remains.

10. What tools are needed to troubleshoot the P1905 code?

Tools include an OBDII scanner, a multimeter for testing electrical circuits, and basic hand tools for inspecting and repairing wiring or connectors.

Discuss the causes and fixes for P1905 Volkswagen OBDII Code

Submit a New Comment

Code P1905 Volkswagen comments

No comments found for this page.