The P0459 code is an OBD-II trouble code that indicates a problem within the evaporative emission control (EVAP) system. This code specifically refers to the Purge Control Valve Circuit being high, suggesting that the engine control module (PCM) has detected a flow in the EVAP system when it should not.
What Does the P0459 Code Mean?
The P0459 code means that the PCM has identified an issue with the evaporative emission system’s purge control valve circuit. This is a critical component that helps manage fuel vapors from the fuel tank, ensuring that they are directed into the engine for combustion instead of being released into the atmosphere.
What Causes the P0459 Code?
Several factors can lead to the P0459 code being triggered, including:
- EVAP purge solenoid failure
- Powertrain Control Module (PCM) failure
- Wiring issues that affect the flow of signals to the PCM
What Are the Symptoms of the P0459 Code?
Common symptoms associated with the P0459 code may include:
- Illuminated Check Engine Light
- Poor engine performance
- Increased fuel consumption
- Possible emissions test failure
How Serious Is the P0459 Code?
The severity of the P0459 code is considered moderate. While it may not pose an immediate threat to the vehicle’s safety or functionality, it is advisable to have the issue diagnosed promptly to prevent further complications and ensure optimal vehicle performance.
How to Diagnose the P0459 Code
To diagnose the P0459 code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the P0459 code and check for any additional codes.
- Inspect the EVAP purge solenoid and associated wiring for any visible damage or disconnections.
- Test the purge valve operation to ensure it is functioning correctly.
- Check the PCM for any faults or updates that may be needed.
Common Repairs for the P0459 Code
Repairs for the P0459 code may include:
- Replacing the EVAP purge solenoid
- Repairing or replacing damaged wiring or connectors
- Replacing the PCM if it is found to be faulty
How Much Does It Cost to Fix the P0459 Code?
The cost to fix the P0459 code can vary widely based on the specific repair needed. Generally, you might expect to pay between $100 and $500, depending on parts and labor costs in your area.
Can I Fix the P0459 Code Myself?
If you have automotive repair experience, you may be able to diagnose and fix the P0459 code yourself, particularly if it involves replacing the EVAP purge solenoid or repairing wiring. However, if you’re unsure, it’s always best to consult with a professional mechanic to avoid causing further issues.
