OBD-II code · Powertrain (generic)
P0459 EVAP System Purge Control Valve A Circuit High
EVAP purge control valve A drive line stuck high — short to B+. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
Is it safe to drive with P0459?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Purge Valve
Related codes
- P0458EVAP System Purge Control Valve A Circuit Low
- P04ADEVAP System Purge Control Valve B Circuit High
- P0456Evaporative Emission System Leak Detected (Very Small Leak)
- P0457Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
- P045AEGR B Control Circuit
- P045BEGR B Control Circuit Range/Performance
- P045CEGR B Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.