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Engine-Codes – Infiniti – P1490 Infiniti

P1490 Infiniti Code - Vacuum Cut Valve Bypass Valve

Quick Answer

The P1490 code in Infiniti vehicles refers to an issue with the Vacuum Cut Valve Bypass Valve. Common causes include Faulty Vacuum Cut Valve Bypass Valve: The most common cause of the P1490 code is a malfunctioning or failed Vacuum Cut Valve Bypass Valve, Vacuum Leaks: Any leaks in the vacuum system can disrupt the flow of vapor and trigger the P1490 code, Wiring Issues: Electrical problems such as damaged wiring or connectors can also cause this code to appear. 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
P1490 Infiniti indicates Vacuum Cut Valve Bypass Valve.
Common causes
Common causes include Faulty Vacuum Cut Valve Bypass Valve: The most common cause of the P1490 code is a malfunctioning or failed Vacuum Cut Valve Bypass Valve, Vacuum Leaks: Any leaks in the vacuum system can disrupt the flow of vapor and trigger the P1490 code, Wiring Issues: Electrical problems such as damaged wiring or connectors can also cause this code to appear.
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 10, 2024
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Code P1490 Infiniti Description

The P1490 code in Infiniti vehicles refers to an issue with the Vacuum Cut Valve Bypass Valve. This valve is an essential component of the vehicle's evaporative emissions system, which is responsible for capturing and storing fuel vapors to prevent them from being released into the atmosphere. The Vacuum Cut Valve Bypass Valve controls the flow of vapors within the system, helping to maintain proper pressure levels.

OBDII Code P1490 Infiniti - Vacuum Cut Valve Bypass Valve
P1490 Infiniti Code - Vacuum Cut Valve Bypass Valve

Common Causes of P1490 Infiniti

  1. Faulty Vacuum Cut Valve Bypass Valve: The most common cause of the P1490 code is a malfunctioning or failed Vacuum Cut Valve Bypass Valve.
  2. Vacuum Leaks: Any leaks in the vacuum system can disrupt the flow of vapor and trigger the P1490 code.
  3. Wiring Issues: Electrical problems such as damaged wiring or connectors can also cause this code to appear.
  4. Clogged or Blocked Valve: Accumulated debris or buildup within the valve can restrict airflow and trigger the code.
  5. Evaporative Emission System Malfunction: Issues with other components of the evaporative emission system can also lead to the P1490 code.

Symptoms of P1490 Infiniti

  1. Check Engine Light: The most common symptom associated with the P1490 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning Vacuum Cut Valve Bypass Valve can lead to increased fuel consumption and reduced fuel efficiency.
  3. Rough Idling: The engine may experience rough idling or hesitation when the valve is not functioning correctly.
  4. Failed Emissions Test: If the issue is severe, it may cause the vehicle to fail emissions tests due to increased emissions.

How to Fix P1490 Infiniti

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific code and pinpoint the exact cause of the problem.
  2. Inspect Vacuum Cut Valve Bypass Valve: Check the valve for any signs of damage, clogs, or leaks. Replace the valve if necessary.
  3. Check for Vacuum Leaks: Inspect the vacuum system for any leaks and repair or replace any damaged components.
  4. Test Wiring and Connectors: Ensure that all wiring and connectors related to the Vacuum Cut Valve Bypass Valve are in good condition.
  5. Clear Codes and Test Drive: Clear the diagnostic codes, reset the check engine light, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P1490 Infiniti

The cost of repairing the Vacuum Cut Valve Bypass Valve can vary depending on the make and model of the vehicle, the location of the repair shop, and the extent of the damage. On average, the parts for this repair can range from $50 to $200, while the labor costs can be between $100 and $300. Overall, the total repair cost for addressing the P1490 code in an Infiniti vehicle can range from $150 to $500. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the issue.

When is the Code Detected?

An improper voltage signal is sent to ECM through vacuum cut valve bypass valve.

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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.

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