P0459 Pontiac Code - Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage
Quick Answer
The P0459 diagnostic trouble code (DTC) for Pontiac vehicles indicates a problem with the evaporative emission purge solenoid valve control circuit having a high voltage. Common causes include Faulty Evaporative Emission Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve, Damaged Wiring or Connectors: Broken, corroded, or damaged wiring or connectors in the control circuit can cause high voltage readings, PCM Malfunction: A problem with the powertrain control module can lead to erroneous voltage readings in the evaporative emission system. 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 Pontiac indicates Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Evaporative Emission Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve, Damaged Wiring or Connectors: Broken, corroded, or damaged wiring or connectors in the control circuit can cause high voltage readings, PCM Malfunction: A problem with the powertrain control module can lead to erroneous voltage readings in the evaporative emission system.
- 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 Pontiac Description
The P0459 diagnostic trouble code (DTC) for Pontiac vehicles indicates a problem with the evaporative emission purge solenoid valve control circuit having a high voltage. The evaporative emission system is a crucial component of a vehicle's emissions control system that helps reduce harmful pollutants from being released into the atmosphere. The purge solenoid valve is responsible for controlling the flow of fuel vapor from the charcoal canister to the engine intake manifold for combustion.
Common Causes of P0459 Pontiac
- Faulty Evaporative Emission Purge Solenoid Valve: The most common cause of the P0459 code is a malfunctioning purge solenoid valve.
- Damaged Wiring or Connectors: Broken, corroded, or damaged wiring or connectors in the control circuit can cause high voltage readings.
- PCM Malfunction: A problem with the powertrain control module can lead to erroneous voltage readings in the evaporative emission system.
- Vacuum Leaks: Any leaks in the vacuum lines connected to the evaporative emission system can disrupt the proper operation of the purge solenoid valve.
Symptoms of P0459 Pontiac
- 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 the engine to idle roughly or inconsistently.
- Decreased Fuel Efficiency: A faulty purge solenoid valve can lead to an increase in fuel consumption due to improper fuel vapor flow.
- Strong Fuel Smell: An issue with the evaporative emission system can result in a strong fuel odor inside and outside the vehicle.
How to Fix P0459 Pontiac
- Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the evaporative emission system to identify the root cause of the high voltage in the purge solenoid valve control circuit.
- Test the Purge Solenoid Valve: Check the functionality of the purge solenoid valve by applying voltage and ground to the valve to see if it operates correctly.
- Inspect Wiring and Connectors: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace any faulty components as needed.
- Address Vacuum Leaks: Inspect the vacuum lines connected to the evaporative emission system for leaks or damage. Repair or replace any affected lines to ensure proper operation.
- Clear Codes and Test Drive: Clear the DTC from the PCM memory using the diagnostic scanner and take the vehicle for a test drive to verify that the issue has been resolved.
Cost to Fix P0459 Pontiac
The typical repair costs for addressing the P0459 code on a Pontiac vehicle can range from $100 to $300, depending on the specific cause of the issue and the labor rates at the auto repair shop. It's important to note that the cost of parts and labor can vary based on the location, vehicle make and model, and engine type. Additionally, the diagnosis time and labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. It is recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances.
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