P1490 GMC 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 GMC 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.
Code P1490 GMC Description
What are the Possible Causes of the DTC P1490 GMC?
- 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 GMC?
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 GMC 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 GMC code?
Need more information on how to fix the P1490 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1490 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P1490 2019 GMC Sierra — EVAP Purge Pump Voltage Sensor Performance
- P1490 2020 GMC Sierra — EVAP Purge Pump Voltage Sensor Performance
- P1490 2021 GMC Sierra — EVAP Purge Pump Voltage Sensor Performance
- P1490 2022 GMC Sierra — EVAP Purge Pump Voltage Sensor Performance
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.
Discuss the causes and fixes for P1490 GMC OBDII Code
Code P1490 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
