P0459 2017 GMC Sierra Code - Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage
Quick Answer
The P0459 code on a 2017 GMC Sierra indicates a problem with the evaporative emission purge solenoid valve control circuit, specifically that the voltage in the circuit is too high. Common causes include Faulty Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve, Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code, Corrosion: Corrosion or damage to the electrical connections can lead to high voltage in the circuit. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0459 2017 GMC Sierra indicates Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve, Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code, Corrosion: Corrosion or damage to the electrical connections can lead to high voltage in the circuit.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
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Code P0459 2017 GMC Sierra Description
The P0459 code on a 2017 GMC Sierra indicates a problem with the evaporative emission purge solenoid valve control circuit, specifically that the voltage in the circuit is too high. The evaporative emission system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The purge solenoid valve controls the flow of these vapors into the engine for combustion.
Common Causes of P0459 2017 GMC Sierra
- Faulty Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve.
- Wiring Issues: Problems with the wiring or connectors in the control circuit can also trigger this code.
- Corrosion: Corrosion or damage to the electrical connections can lead to high voltage in the circuit.
- PCM Malfunction: A malfunctioning powertrain control module (PCM) can also cause the voltage in the circuit to be too high.
Symptoms of P0459 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with the P0459 code is the illumination of the check engine light on the dashboard.
- Rough Idle: A rough or unstable idle may occur due to improper fuel vapor flow into the engine.
- Decreased Fuel Efficiency: The vehicle may experience decreased fuel efficiency as a result of the evaporative emission system not functioning optimally.
- Failed Emissions Test: If the issue is not resolved, the vehicle may fail an emissions test due to increased emissions.
How to Fix P0459 2017 GMC Sierra
- Diagnose the Issue: Use a scan tool to read the code and perform a thorough inspection of the evaporative emission system to identify the root cause of the high voltage.
- Test the Purge Solenoid Valve: Test the purge solenoid valve to determine if it is functioning properly. Replace it if necessary.
- Check Wiring and Connections: Inspect the wiring and connectors in the control circuit for any damage or corrosion. Repair or replace as needed.
- Clear the Code: After making the necessary repairs, clear the code from the vehicle's memory using a scan tool.
- Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P0459 2017 GMC Sierra
The typical repair costs for addressing a P0459 code on a 2017 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also impact the overall repair costs.
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Frequently Asked Questions about P0459 2017 GMC Sierra Code
What does the OBDII code P0459 mean for a 2017 GMC Sierra?
P0459 indicates a "Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage," meaning the purge solenoid is receiving an excessively high voltage signal.
What are the common symptoms of code P0459 in a GMC Sierra?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, difficulty starting, or a noticeable gasoline odor.
What causes code P0459 to appear in a GMC Sierra?
Typical causes include a faulty purge solenoid valve, damaged wiring or connectors in the circuit, or an issue with the powertrain control module (PCM).
Can driving with code P0459 damage my 2017 GMC Sierra?
Driving with code P0459 typically won't cause immediate damage, but it can lead to reduced fuel efficiency and may affect emissions.
How do I diagnose the P0459 code on my GMC Sierra?
Inspect the purge solenoid valve, wiring, and connectors for damage or corrosion. Use a multimeter to check voltage and continuity in the circuit.
What tools do I need to fix code P0459 on a GMC Sierra?
You may need a multimeter, OBDII scanner, basic hand tools, and repair manuals to diagnose and fix the issue.
How do I fix code P0459 on a 2017 GMC Sierra?
Start by replacing the purge solenoid valve if faulty, repairing damaged wiring, cleaning corroded connectors, or updating/reprogramming the PCM if needed.
Is the P0459 code covered under warranty for a GMC Sierra?
Evaporative emission-related repairs may be covered under the vehicle’s emissions warranty, depending on mileage and age.
How much does it cost to repair P0459 on a GMC Sierra?
Repair costs vary but generally range from $100 to $300, depending on whether the purge solenoid valve or wiring needs replacement.
Can I clear code P0459 without fixing the issue?
Clearing the code without addressing the problem may temporarily turn off the check engine light, but the code will likely return as the underlying issue persists.
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