P0459: Evaporative Emission System Purge Control Valve A Circuit High
What to do
Usually driveable with no symptom. Will fail an emissions test.
What this code means
The purge valve control circuit is reading high — an open circuit, or a control wire that has found a voltage supply. The counterpart of the circuit-low fault, and diagnosed the same way: isolate the valve and re-measure to determine which side of the connector the fault lies on.
Likely causes
Start here
- Open or shorted solenoid winding · easy
- Broken wire in control circuit · moderate
- Corroded or loose connector · easy
Less common
- Signal wire shorted to voltage · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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