OBD Guide
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P0459

EVAP System Purge Control Valve A Circuit High

P0459 is an OBD-II diagnostic trouble code meaning: EVAP System Purge Control Valve A Circuit High. Common causes: open circuit in the evap purge valve control circuit wiring, shorting the control wire to power. Estimated repair cost: $6–39.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–39 (est.)

Symptoms

  • Check Engine light is on
  • The smell of fuel near the car
  • EVAP System Purge Test Failure
  • Slight enrichment of the fuel mixture (if the valve is stuck open)
  • Unstable idle under some conditions
  • Increased fuel consumption in the long term

Causes

  • Open circuit in the EVAP purge valve control circuit wiring
  • Shorting the control wire to power
  • Internal open in purge valve solenoid
  • Damaged or oxidized valve connector
  • Malfunction of the EVAP system power relay (on some cars)
  • Damage to the ECU control circuit (rare)

How to Fix

  1. Find EVAP purge valve A using the car's wiring diagram
  2. Inspect the valve connector and wiring for damage.
  3. Check the resistance of the valve solenoid (normal 15–30 ohms; infinity - open)
  4. Check the control circuit from the computer to the valve for an open circuit and short to power
  5. Apply 12V voltage directly to the valve - it should click and open
  6. Replace the purge valve if the solenoid is broken internally
  7. Eliminate wiring damage due to external causes
  8. Reset code and perform EVAP test

Related codes

P0440P0441P0443P0444P0445P0446P0447P0448P0453P0455

Error P0459 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0459 code mean?

P0459 is an OBD-II diagnostic trouble code that indicates: EVAP System Purge Control Valve A Circuit High

What causes a P0459 error code?

The most common causes of P0459 include: Open circuit in the EVAP purge valve control circuit wiring; Shorting the control wire to power; Internal open in purge valve solenoid; Damaged or oxidized valve connector.

How do I fix a P0459 diagnostic trouble code?

To fix P0459: Find EVAP purge valve A using the car's wiring diagram. Inspect the valve connector and wiring for damage.. Check the resistance of the valve solenoid (normal 15–30 ohms; infinity - open). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0459?

Do not drive — repair immediately

How much does it cost to fix P0459?

The estimated repair cost for P0459 is $6–39. Actual cost depends on your vehicle, location, and labor rates.

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