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Engine-Codes – GMC – P1490 GMC

P1490 GMC Code - EVAP Purge Pump Voltage Sensor Performance

Quick Answer

The P1490 GMC code indicates a problem with the EVAP purge pump voltage sensor performance. Common causes include Faulty Purge Pump Voltage Sensor: The most common cause of the P1490 code is a malfunctioning purge pump voltage sensor, Wiring Issues: Damaged or corroded wiring connected to the sensor can also trigger this code, EVAP System Leak: A leak in the EVAP system can affect the sensor's readings and lead to this code. 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 GMC indicates EVAP Purge Pump Voltage Sensor Performance.
Common causes
Common causes include Faulty Purge Pump Voltage Sensor: The most common cause of the P1490 code is a malfunctioning purge pump voltage sensor, Wiring Issues: Damaged or corroded wiring connected to the sensor can also trigger this code, EVAP System Leak: A leak in the EVAP system can affect the sensor's readings and lead to this code.
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 08, 2024
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Code P1490 GMC Description

The P1490 GMC code indicates a problem with the EVAP purge pump voltage sensor performance. The EVAP system is responsible for capturing and storing fuel vapors to prevent them from being released into the atmosphere. The purge pump voltage sensor is a crucial component of this system as it monitors the voltage levels to ensure proper functioning.

OBDII Code P1490 GMC - EVAP Purge Pump Voltage Sensor Performance
P1490 GMC Code - EVAP Purge Pump Voltage Sensor Performance

Common Causes of P1490 GMC

  1. Faulty Purge Pump Voltage Sensor: The most common cause of the P1490 code is a malfunctioning purge pump voltage sensor.
  2. Wiring Issues: Damaged or corroded wiring connected to the sensor can also trigger this code.
  3. EVAP System Leak: A leak in the EVAP system can affect the sensor's readings and lead to this code.
  4. Purge Pump Failure: A failing purge pump can cause voltage fluctuations that trigger the P1490 code.

Symptoms of P1490 GMC

  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 EVAP system can lead to decreased fuel efficiency as the engine may not be burning fuel vapors efficiently.
  3. Rough Idle: The engine may experience rough idling or stalling due to improper fuel vapor management.
  4. Increased Emissions: The vehicle may fail emissions tests or emit higher levels of pollutants due to a malfunctioning EVAP system.

How to Fix P1490 GMC

  1. Diagnose the Issue: Use an OBD-II scanner to confirm the P1490 code and identify the specific component causing the problem.
  2. Inspect Wiring: Check the wiring connected to the purge pump voltage sensor for any damage or corrosion. Repair or replace as needed.
  3. Test Purge Pump: Test the purge pump and voltage sensor to ensure they are functioning correctly. Replace any faulty components.
  4. Clear Codes: Once the issue is resolved, clear the diagnostic codes to reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure the repair was successful and the code does not reappear.

Cost to Fix P1490 GMC

The cost of repairing a P1490 code can vary depending on the specific cause of the issue. In general, the parts required for this repair, such as a new purge pump voltage sensor or wiring, can range from $50 to $200. Labor costs at an auto repair shop can add an additional $100 to $200 to the total bill. Overall, the total repair cost for this issue is typically between $150 and $400, but this can vary based on the location, vehicle make and model, and the severity of the problem. It's recommended to consult with a qualified mechanic for a more accurate estimate based on your specific situation.

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Information for Specific GMC 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.

Frequently Asked Questions about P1490 GMC Code

1. What does the OBDII code P1490 mean for a GMC vehicle?

P1490 indicates an issue with the EVAP purge pump voltage sensor performance, suggesting a problem with the sensor or its related circuitry.

2. What are the common symptoms of code P1490 on a GMC?

Symptoms may include the Check Engine Light turning on, increased fuel odor, poor fuel efficiency, and difficulty passing emissions tests.

3. What causes the P1490 code on a GMC?

Common causes include a faulty EVAP purge pump voltage sensor, damaged wiring or connectors, or a malfunctioning EVAP purge pump.

4. Can I drive my GMC with the P1490 code?

While the vehicle may still be drivable, it’s recommended to address the issue promptly to prevent further damage and ensure compliance with emissions standards.

5. How is code P1490 diagnosed?

A mechanic will typically use a scan tool to read the code, inspect the EVAP system components, and test the voltage sensor and related wiring for faults.

6. How do I fix the P1490 code on my GMC?

Repairs may involve replacing the EVAP purge pump voltage sensor, repairing damaged wiring or connectors, or replacing the EVAP purge pump if it's faulty.

7. How much does it cost to fix the P1490 code on a GMC?

Repair costs vary depending on the issue but typically range from $150 to $500, including parts and labor.

8. Can a loose gas cap cause the P1490 code?

No, a loose gas cap usually triggers other EVAP-related codes. P1490 specifically relates to the purge pump voltage sensor performance.

9. Will clearing the P1490 code fix the problem?

Clearing the code may temporarily turn off the Check Engine Light, but the underlying issue must be repaired to prevent the code from returning.

10. What tools are needed to troubleshoot the P1490 code?

Diagnosing this code typically requires an OBDII scan tool, a multimeter for voltage testing, and access to the vehicle’s wiring diagrams.

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