Powertrain, generic · Auxiliary emission controls

P0441 EVAP System Incorrect Purge Flow

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. P0441 means the actual purge flow does not match the target – too little, or flow although the purge valve is closed. CARB requires a fault when no purge flow is detected. Strategies differ widely: Saab's Trionic T7/T8 sets it for flow with the valve closed (tank pressure falling faster than 27.5–40 Pa/s), VW and Audi check purge flow with the leak detection pump, Honda/Acura for a sticking purge valve. GM and Ford do not use P0441 – they report flow with the valve closed as P0496 or P1450 and missing flow as P0455.

Likely causes

Purge valve stuck open or not sealing
Purge valve stuck closed, purge line blocked, kinked or off
Leak detection pump with tolerance fault (VW)
Canister saturated or damaged, turbo purge check valve faulty

Symptoms

  • Check engine light on
  • Rough idle or hard start after refuelling (valve stuck open)
  • Fuel smell
  • Possibly fuel trim codes

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–300
Time0.3–1.5 h

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

What to check first

  1. Test the purge valve
  2. Inspect hoses
  3. Check the canister

Parts involved

evap purge valvepurge linecharcoal canisterengine control module

Related codes

P0496P0497P0443P0455P0440P0458

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov, static.nhtsa.gov.