AutoCodes – GMC – P1490 2020 GMC Sierra

P1490 2020 GMC Sierra Code - EVAP Purge Pump Voltage Sensor Performance

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection. 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 2020 GMC Sierra indicates EVAP Purge Pump Voltage Sensor Performance.
Common causes: Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection.
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.

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Code Popularity 315

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1490 2020 GMC Sierra Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, and the Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Voltage and Ignition Voltage are not within 2.0 V of each other for greater than 1 s.

OBDII Code P1490 2020 GMC Sierra - EVAP Purge Pump Voltage Sensor Performance - AutoCodes.com — P1490 2020 GMC Sierra Code - EVAP Purge Pump Voltage Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1490 2020 GMC Sierra?

Faulty Evaporative Emission Purge Pump
Evaporative Emission Purge Pump harness is open or shorted
Evaporative Emission Purge Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1490 2020 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1490 2020 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1490 2020 GMC Sierra code?

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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 P1490 2020 GMC Sierra Code

1. What are the common symptoms of OBDII code P1490 in a 2020 GMC Sierra?

- Common symptoms include the Check Engine light turning on, poor engine performance, and potential fuel economy issues.

2. What does the OBDII code P1490 on a 2020 GMC Sierra indicate?

- OBDII code P1490 indicates a problem with the EVAP Purge Pump Voltage Sensor Performance in the vehicle.

3. What are the possible causes of OBDII code P1490 in a 2020 GMC Sierra?

- Possible causes include a faulty EVAP purge pump, damaged wiring or connectors, a defective purge valve, or issues with the EVAP system's control module.

4. How can I diagnose the issue related to OBDII code P1490 in my 2020 GMC Sierra?

- Diagnosing the problem involves conducting a thorough inspection of the EVAP system components, checking for damaged wiring, testing the purge pump voltage sensor, and scanning for any other related trouble codes.

5. Can I continue driving my 2020 GMC Sierra with OBDII code P1490 present?

- It is recommended to address the issue promptly to prevent potential damage to other components and ensure optimal vehicle performance. However, if the symptoms are not severe, you may be able to drive the vehicle to a repair facility.

6. How can I repair OBDII code P1490 in my 2020 GMC Sierra?

- Repair options may include replacing the faulty EVAP purge pump, repairing damaged wiring or connectors, replacing the purge valve, or addressing any issues with the control module as needed.

7. Are there any DIY tips for addressing OBDII code P1490 in a 2020 GMC Sierra?

- While some basic checks like inspecting for loose connections or damaged wiring can be done by DIY enthusiasts, diagnosing and repairing the specific issue related to this code may require professional expertise and specialized tools.

8. How much does it typically cost to fix OBDII code P1490 in a 2020 GMC Sierra?

- The cost of repair can vary based on the root cause of the issue, the labor rates in your area, and the specific components that need to be replaced. It's advisable to obtain quotes from reputable mechanics or dealerships.

9. Can resetting the Check Engine light resolve OBDII code P1490 in my 2020 GMC Sierra?

- Resetting the Check Engine light may temporarily clear the code, but it will not address the underlying issue causing OBDII code P1490. It's crucial to diagnose and repair the problem to prevent it from recurring.

10. How often does OBDII code P1490 occur in a 2020 GMC Sierra?

- The occurrence of this specific OBDII code can vary depending on the vehicle's usage, maintenance history, and overall condition of the EVAP system. If the code appears, it should be addressed promptly to avoid potential complications.