Powertrain, generic · Auxiliary emission controls

P04E0 EVAP System Purge Control Valve A Stuck Closed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Purge valve A is the main EVAP purge valve between charcoal canister and intake manifold (on turbo engines the low-load path); its electrical circuit faults are P0443, P0458 and P0459. No manufacturer document available to us uses this code; the description follows GM's comparable check P0496, Subaru's valve B counterpart P04AE and CARB's purge flow requirement. P04E0 means valve A does not open although it is driven: no vacuum builds up in the tank and the mixture does not react while purging – CARB requires missing purge flow to be detected. The canister is then not purged and saturates, causing fuel smell and early nozzle shut-off.

Likely causes

Purge valve A stuck closed (gummed, charcoal dust, spring or armature)
Purge line kinked or blocked
Canister or vent blocked
Tank pressure sensor faulty

Symptoms

  • Check engine light on
  • Fuel smell
  • Nozzle clicks off early when refuelling

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

evap purge valvepurge linecharcoal canisterengine control module

Related codes

P04DFP0497P0441P0455P04AFP0443

References: saabwisonline.com, static.nhtsa.gov, law.cornell.edu.