P0459 Cadillac Code - Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage
Quick Answer
The P0459 Cadillac code indicates a problem with the evaporative emission purge solenoid valve control circuit, specifically that the voltage is too high. Common causes include Faulty evaporative emission purge solenoid valve, Wiring or electrical issues in the control circuit, Corrosion or poor connection 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 Cadillac indicates Evaporative Emission Purge Solenoid Valve Control Circuit High Voltage.
- Common causes
- Common causes include Faulty evaporative emission purge solenoid valve, Wiring or electrical issues in the control circuit, Corrosion or poor connection 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 Cadillac Description
The P0459 Cadillac code indicates a problem with the evaporative emission purge solenoid valve control circuit, specifically that the voltage is too high. The evaporative emission system is designed to prevent fuel vapors from escaping into the atmosphere, and the purge solenoid valve controls the flow of vapors from the charcoal canister to the engine intake for combustion. When the voltage in the control circuit is too high, it can lead to issues with the proper functioning of the valve, potentially causing fuel vapors to escape, decreasing fuel efficiency, and triggering the Check Engine light.
Common Causes of P0459 Cadillac
- Faulty evaporative emission purge solenoid valve
- Wiring or electrical issues in the control circuit
- Corrosion or poor connection in the circuit
- PCM (powertrain control module) failure
- Fuel system leaks
Symptoms of P0459 Cadillac
- Check Engine light illuminated
- Decreased fuel efficiency
- Rough idling or stalling
- Strong fuel odor
- Failed emissions test
How to Fix P0459 Cadillac
- Diagnose the specific cause of the high voltage in the control circuit using a scan tool.
- Inspect the wiring and connections for any damage or corrosion, repairing or replacing as necessary.
- Test the evaporative emission purge solenoid valve for proper functioning and replace if faulty.
- Clear the diagnostic code and reset the Check Engine light.
- Perform a test drive to ensure the issue has been resolved and that the Check Engine light does not reappear.
Cost to Fix P0459 Cadillac
The typical repair cost for addressing a P0459 Cadillac code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to factor in the diagnosis time and labor rates at your local auto repair shop, as these can vary and impact the overall cost of the repair. It's recommended to consult with a professional technician to get an accurate estimate for your specific vehicle.
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