P0459 2016 GMC Sierra Code - Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage
Quick Answer
The P0459 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the evaporative emission purge solenoid valve control circuit having high voltage. Common causes include Faulty Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning evaporative emission purge solenoid valve, Wiring Issues: Problems with the wiring harness, such as shorts or open circuits, can also trigger this code, PCM Malfunction: A malfunction in the Powertrain Control Module (PCM) could incorrectly detect high voltage in the solenoid valve 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 2016 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 evaporative emission purge solenoid valve, Wiring Issues: Problems with the wiring harness, such as shorts or open circuits, can also trigger this code, PCM Malfunction: A malfunction in the Powertrain Control Module (PCM) could incorrectly detect high voltage in the solenoid valve 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 2016 GMC Sierra Description
The P0459 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the evaporative emission purge solenoid valve control circuit having high voltage. 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 fuel vapors from the charcoal canister to the engine intake manifold for combustion.
Common Causes of P0459 2016 GMC Sierra
- Faulty Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning evaporative emission purge solenoid valve.
- Wiring Issues: Problems with the wiring harness, such as shorts or open circuits, can also trigger this code.
- PCM Malfunction: A malfunction in the Powertrain Control Module (PCM) could incorrectly detect high voltage in the solenoid valve circuit.
- Vacuum Leaks: Any leaks in the vacuum lines connected to the evaporative emission system can disrupt the proper functioning of the purge solenoid valve.
- Charcoal Canister Issues: A clogged or damaged charcoal canister can affect the flow of fuel vapors in the system, leading to the P0459 code.
Symptoms of P0459 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with the P0459 code is the illumination of the check engine light on the vehicle's dashboard.
- Rough Idle: A malfunctioning evaporative emission purge solenoid valve can cause rough idling or stalling of the engine.
- Decreased Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to improper fuel vapor management.
- Strong Fuel Odor: A strong smell of fuel inside or outside the vehicle could indicate a leak in the evaporative emission system.
- Failed Emissions Test: If the P0459 code is not addressed, it could lead to the vehicle failing an emissions test due to increased emissions.
How to Fix P0459 2016 GMC Sierra
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the evaporative emission system components.
- Check Wiring and Connections: Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
- Test Purge Solenoid Valve: Test the functionality of the evaporative emission purge solenoid valve to determine if it is faulty. Replace the valve if needed.
- Clear DTC and Test Drive: Clear the DTC from the PCM memory and test drive the vehicle to ensure the issue has been resolved.
- Perform Smoke Test: Conduct a smoke test to check for any leaks in the evaporative emission system and repair as needed.
Cost to Fix P0459 2016 GMC Sierra
The typical repair costs for addressing the P0459 code on a 2016 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the cost of diagnosing the problem, replacing the purge solenoid valve if necessary, and any additional repairs or parts required. It's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to get an accurate estimate.
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Frequently Asked Questions about P0459 2016 GMC Sierra Code
1. What does OBDII code P0459 mean on a 2016 GMC Sierra?
Code P0459 indicates that the Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit is experiencing high voltage, suggesting an issue with the valve or its electrical circuit.
2. What are the common symptoms of code P0459 in a 2016 GMC Sierra?
Symptoms may include an illuminated check engine light, reduced fuel efficiency, difficulty fueling, and a faint fuel odor near the vehicle.
3. What causes the P0459 code on a 2016 GMC Sierra?
Common causes include a faulty EVAP purge solenoid valve, damaged wiring or connectors in the purge valve circuit, or a malfunctioning powertrain control module (PCM).
4. Can I drive my 2016 GMC Sierra with a P0459 code?
Yes, but it’s not recommended for extended periods. While the issue is unlikely to cause immediate damage, it can affect fuel efficiency and emissions performance.
5. How do I diagnose the P0459 code on a 2016 GMC Sierra?
Start by checking the EVAP purge solenoid valve for proper operation, inspect the wiring and connectors for damage, and use a multimeter to test the circuit voltage.
6. How do I fix the P0459 code on my 2016 GMC Sierra?
Repairs may include replacing the EVAP purge solenoid valve, repairing or replacing damaged wiring/connectors, or inspecting and updating the PCM if necessary.
7. How much does it cost to fix code P0459 on a 2016 GMC Sierra?
Repair costs vary but typically range from $100 to $300, depending on whether it involves replacing the purge solenoid valve or repairing wiring.
8. What tools are needed to troubleshoot the P0459 code?
You’ll need an OBDII scanner, a multimeter, and basic hand tools to inspect and test the EVAP purge solenoid valve and wiring.
9. Can a loose gas cap cause the P0459 code on a 2016 GMC Sierra?
No, a loose gas cap typically triggers other EVAP-related codes, but it’s still a good idea to check it as part of troubleshooting.
10. Will clearing the P0459 code with a scanner fix the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying problem must be addressed to prevent the code from returning.
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