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P1801 Nissan Code - Variable Intake Air System Control Solenoid Valve 2

Quick Answer

The P1801 Nissan diagnostic trouble code refers to an issue with the Variable Intake Air System Control Solenoid Valve 2. Common causes include Faulty solenoid valve, Wiring or electrical connection issues, Vacuum leaks. 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
P1801 Nissan indicates Variable Intake Air System Control Solenoid Valve 2.
Common causes
Common causes include Faulty solenoid valve, Wiring or electrical connection issues, Vacuum leaks.
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 05, 2024
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Code P1801 Nissan Description

The P1801 Nissan diagnostic trouble code refers to an issue with the Variable Intake Air System Control Solenoid Valve 2. This valve is responsible for controlling the flow of air into the engine, allowing for optimal performance and fuel efficiency. When this solenoid valve malfunctions, it can lead to a variety of issues that may impact the vehicle's overall performance.

OBDII Code P1801 Nissan - Variable Intake Air System Control Solenoid Valve 2
P1801 Nissan Code - Variable Intake Air System Control Solenoid Valve 2

Common Causes of P1801 Nissan

  1. Faulty solenoid valve
  2. Wiring or electrical connection issues
  3. Vacuum leaks
  4. Clogged or dirty intake air system
  5. Engine computer (ECU) malfunction

Symptoms of P1801 Nissan

  1. Engine misfires
  2. Reduced fuel efficiency
  3. Rough idling
  4. Engine stalling
  5. Decreased acceleration

How to Fix P1801 Nissan

  1. Begin by conducting a thorough inspection of the Variable Intake Air System Control Solenoid Valve 2 and its surrounding components.
  2. Test the solenoid valve to determine if it is functioning properly.
  3. Replace the solenoid valve if it is found to be faulty.
  4. Check and repair any damaged wiring or electrical connections.
  5. Clean or replace any clogged or dirty components in the intake air system.

Cost to Fix P1801 Nissan

The cost of repairing the Variable Intake Air System Control Solenoid Valve 2 can vary depending on the specific make and model of the vehicle, as well as the labor rates in your area. On average, the repair cost for this issue can range from $150 to $400, including parts and labor. It's important to consult with a professional mechanic to get an accurate estimate based on your individual circumstances.

When is the Code Detected?

The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator. An excessively low or high voltage signal is sent to ECM through the valve

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Information for Specific Nissan Models

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.

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