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OBD-II · Engine and powertrain (P)

P0441

EVAP system incorrect purge flow

What it means

The ECU sees more or less fuel vapour flow from the charcoal canister into the engine than expected when it opens the purge valve.

Symptoms

  • engine warning light
  • rough idle or hard starting just after refuelling (purge valve stuck open)
  • fuel smell

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01purge valve stuck open or closed
02cracked, disconnected or blocked purge hose
03saturated or blocked charcoal canister
04wiring fault to the purge valve

What to check, step by step

  1. 01Inspect the purge hoses from the canister to the intake for cracks and disconnection
  2. 02With the engine off, test the purge valve with a hand vacuum pump at the specified ports and vacuum; follow the OEM powered/unpowered leakage criteria rather than blowing through it.
  3. 03Activate the valve with a scan tool and listen for clicking; watch fuel trims change
  4. 04Check the canister for fuel contamination (from overfilling) and blockage