OBD-II Code · Emissions
P0459
EVAP Purge Control Valve Circuit High
Severity
low
Lowest on our scale. Fix it when convenient.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$100–$300
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Purge valve voltage high.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Likely causes
- Short to powerMost common
- Failed valve
Read the full diagnostic procedureP0459 means the ECM saw the EVAP purge valve control circuit pulled HIGH when it commanded LOW (or stuck high during the off cycle) — the purge solen…
P0459 means the ECM saw the EVAP purge valve control circuit pulled HIGH when it commanded LOW (or stuck high during the off cycle) — the purge solenoid is a PWM-driven valve on the engine side of the EVAP line, and the ECM monitors its driver feedback voltage to confirm the coil is actually toggling.
Cheapest-first ladder on a shop floor
- Unplug the purge solenoid and ohm the coil across pins — a healthy solenoid reads 25-50 ohms typical at room temp (Bosch units run 22-30, Denso run 30-50, Continental run 26-35); open or infinite = burned coil, under 15 ohms = shorted winding.
- Key-on, backprobe the solenoid connector and confirm 12V+ on the supply pin with ignition; the ECM pulls the ground side.
- Command the purge solenoid ON with a bidirectional scan tool and watch current draw — healthy is 0.3-0.7A at 12V; over 1.0A means a shorted coil starting to fail, under 0.2A means a high-resistance connection.
- Inspect the connector pins for water intrusion and the harness for chafe against the intake or A/C lines. Before condemning the purge solenoid, check the purge line itself for breaks/disconnections — Ford EcoBoost purge lines route over the intake and crack from heat soak, and a $5 vacuum hose fix saves a $400 solenoid replacement that won't clear the code.
Vehicle-specific patterns2002-2010 Toyota Camry/Highlander/Sienna with the 1MZ-FE/2GR-FE V6 commonly throws P0459 from purge solenoid wiring chafe where the harness crosses t…
- 2002-2010Toyota Camry/Highlander/Sienna with the 1MZ-FE/2GR-FE V6 commonly throws P0459 from purge solenoid wiring chafe where the harness crosses the rear of the intake manifold — the insulation rubs through on the manifold bracket and shorts to ground intermittently, scope-confirm with a wiggle test.
- 2007-2014GM Vortec V8 trucks/SUVs (Silverado, Tahoe, Suburban) throws P0459 because the canister and purge valve sit near the fuel filler on the frame rail and the connector corrodes from road salt and wheel splash — repin the connector before swapping the solenoid.
- 2004-2010Ford F-150/Mustang 4.6L Triton frequently throws P0459 from cracked purge lines at the intake plenum where the rubber elbow meets the hard plastic line; the crack is hard to see and only opens up under engine heat.
- 2008-2013Hyundai Sonata/Santa Fe with the Theta 2.4L throws P0459 from the purge solenoid sticking electrically after carbon canister overflow.
Estimated repair$80 to $400.
Look up another code
P0459 — frequently asked
What does a P0459 code mean?
Purge valve voltage high.
What causes a P0459 code?
Common causes: Short to power; Failed valve.
What are the symptoms of a P0459 code?
Typical symptoms: Check engine light.
Is it safe to drive with a P0459 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $100-$300.
How do I diagnose a P0459 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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