AutoCodes – Chevrolet – P1490 2020 Chevrolet Silverado

P1490 2020 Chevrolet Silverado 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 Chevrolet Silverado 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 325

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 Chevrolet Silverado 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 Chevrolet Silverado - EVAP Purge Pump Voltage Sensor Performance - AutoCodes.com — P1490 2020 Chevrolet Silverado Code - EVAP Purge Pump Voltage Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1490 2020 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P1490 2020 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1490 2020 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Silverado Code

1. What does OBDII code P1490 on a 2020 Chevrolet Silverado indicate?

The code P1490 indicates a problem with the EVAP Purge Pump Voltage Sensor Performance in the vehicle's evaporative emission control system.

2. What are the common symptoms of OBDII code P1490 on a 2020 Chevrolet Silverado?

Common symptoms of code P1490 may include rough idling, decreased fuel efficiency, and the illumination of the check engine light on the dashboard.

3. What are some possible causes of OBDII code P1490 on a 2020 Chevrolet Silverado?

Potential causes of code P1490 can include a faulty EVAP purge pump, damaged wiring or connectors in the EVAP system, or a malfunctioning EVAP purge pump voltage sensor.

4. How can I diagnose the issue related to OBDII code P1490 on a 2020 Chevrolet Silverado?

To diagnose the problem, it is recommended to use an OBDII scanner to retrieve the specific trouble code, inspect the EVAP system components for any visible damage, and test the EVAP purge pump voltage sensor for proper functionality.

5. Can I continue driving my 2020 Chevrolet Silverado with OBDII code P1490?

While the vehicle may still be operable with the code P1490 present, it is recommended to address the issue promptly to prevent potential damage to the emissions control system and ensure optimal engine performance.

6. How can I repair OBDII code P1490 on a 2020 Chevrolet Silverado?

Repairing code P1490 may involve replacing the EVAP purge pump, repairing or replacing damaged wiring or connectors, or replacing the EVAP purge pump voltage sensor based on the specific diagnosis of the issue.

7. Is it necessary to reset the OBDII code P1490 after making repairs on a 2020 Chevrolet Silverado?

Yes, it is important to clear the trouble code using an OBDII scanner after completing the repairs related to code P1490 to reset the check engine light and monitor the system for any recurring issues.

8. How much should I expect to pay for repairing OBDII code P1490 on a 2020 Chevrolet Silverado?

The cost of repairing code P1490 can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor charges.

9. Are there any preventive maintenance tips to avoid OBDII code P1490 on a 2020 Chevrolet Silverado?

To prevent code P1490, it is advisable to perform regular inspections of the EVAP system components, maintain proper fuel cap sealing, and address any issues related to the evaporative emission control system promptly.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1490 on a 2020 Chevrolet Silverado?

While some repairs related to code P1490 may be performed by individuals with basic automotive knowledge and tools, it is recommended to consult a professional mechanic for a proper diagnosis and repair to ensure the issue is resolved correctly.