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P1900 Volkswagen Code - Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground

Quick Answer

The P1900 diagnostic trouble code for Volkswagen vehicles indicates a problem with the Engine Coolant Blower Motor Speed 2 circuit. Common causes include Faulty blower motor: The blower motor itself may be faulty and in need of replacement, Wiring issues: Damaged or corroded wiring connections can lead to an open circuit or short to ground, Blown fuse: A blown fuse in the blower motor circuit can cause the motor to stop working. 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
P1900 Volkswagen indicates Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground.
Common causes
Common causes include Faulty blower motor: The blower motor itself may be faulty and in need of replacement, Wiring issues: Damaged or corroded wiring connections can lead to an open circuit or short to ground, Blown fuse: A blown fuse in the blower motor circuit can cause the motor to stop working.
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 13, 2024
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Code P1900 Volkswagen Description

The P1900 diagnostic trouble code for Volkswagen vehicles indicates a problem with the Engine Coolant Blower Motor Speed 2 circuit. Specifically, it points to an open circuit or a short to ground in the system. The engine coolant blower motor is responsible for helping to regulate the temperature of the engine by cooling down the coolant in the radiator. When this motor is not functioning properly, it can lead to overheating issues, which can cause significant damage to the engine if left unresolved.

OBDII Code P1900 Volkswagen - Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground
P1900 Volkswagen Code - Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground

Common Causes of P1900 Volkswagen

  1. Faulty blower motor: The blower motor itself may be faulty and in need of replacement.
  2. Wiring issues: Damaged or corroded wiring connections can lead to an open circuit or short to ground.
  3. Blown fuse: A blown fuse in the blower motor circuit can cause the motor to stop working.
  4. Faulty relay: A malfunctioning relay that controls the blower motor speed can trigger this diagnostic trouble code.

Symptoms of P1900 Volkswagen

  1. Engine overheating: One of the most common symptoms associated with this code is engine overheating due to the coolant blower motor not functioning properly.
  2. Inoperative blower motor: The blower motor may not turn on at all or may operate at a lower speed than usual.
  3. Check Engine Light: The Check Engine Light may illuminate on the dashboard to indicate a problem with the engine coolant blower motor speed circuit.
  4. Poor HVAC performance: The vehicle's heating, ventilation, and air conditioning (HVAC) system may not work efficiently due to the blower motor issue.

How to Fix P1900 Volkswagen

  1. Diagnose the issue: Use a multimeter to test the blower motor, wiring, fuses, and relays to identify the source of the problem.
  2. Replace the blower motor: If the blower motor is found to be faulty, it will need to be replaced with a new unit.
  3. Repair wiring connections: Repair or replace any damaged or corroded wiring connections in the blower motor circuit.
  4. Replace blown fuse: If a blown fuse is the culprit, replace it with a new fuse of the correct amperage rating.
  5. Replace faulty relay: If the relay is malfunctioning, it should be replaced with a new one to restore proper operation of the blower motor.

Cost to Fix P1900 Volkswagen

The cost of repairing the Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, the cost of replacing a blower motor can range from $150 to $300, while repairing wiring connections or replacing a relay may cost between $50 and $150. Additionally, you may need to budget for diagnostic time, which can range from $80 to $150 per hour at most auto repair shops. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for your specific 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 P1900 Volkswagen Code

1. What does OBDII code P1900 mean on a Volkswagen?

Code P1900 indicates an "Engine Coolant Blower Motor Speed 2 Open Circuit/Short to Ground," meaning there is a problem with the blower motor circuit responsible for cooling the engine.

2. What are the symptoms of P1900 in a Volkswagen?

Common symptoms include the engine overheating, reduced cooling efficiency, the blower motor not functioning at higher speeds, and possibly a lit check engine light.

3. What causes the P1900 code in a Volkswagen?

The main causes include a faulty blower motor, damaged wiring or connectors, a blown fuse, or a malfunctioning blower motor resistor.

4. Can I drive my Volkswagen with a P1900 code?

It’s not recommended, as an inoperative blower motor can lead to engine overheating, which can cause severe damage if not addressed promptly.

5. How do I diagnose a P1900 code on a Volkswagen?

Start by inspecting the blower motor wiring and connectors for damage, test the blower motor itself, check the fuses, and verify the functionality of the blower motor resistor.

6. How do I fix the P1900 code in my Volkswagen?

Repairs may include replacing the blower motor, repairing damaged wiring or connectors, replacing a blown fuse, or replacing the blower motor resistor.

7. Is a faulty blower motor resistor a common cause of P1900?

Yes, a failed blower motor resistor is a common cause, as it regulates the motor's speed and can fail due to wear or overheating.

8. How much does it cost to fix a P1900 code on a Volkswagen?

Costs vary, but replacing a blower motor can range from $150 to $400, while a resistor replacement may cost $50 to $150, excluding labor.

9. Can a short to ground cause the P1900 code?

Yes, a short to ground in the blower motor circuit can trigger this code by disrupting the electrical flow.

10. How can I prevent the P1900 code from reoccurring?

Regular maintenance, including checking electrical connections and ensuring the cooling system components are in good condition, can help prevent this issue.

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