P04DF

EVAP System Purge Control Valve A Performance/Stuck Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$22–89 (est.)

Symptoms

Unstable idle
Increased fuel consumption
Smell of gasoline in the cabin
Dips during acceleration

Causes

Purge valve stuck open
Open or short circuit in valve control circuit
Wiring harness damage
Mechanical valve wear
ECU software error

How to Fix

Carry out a visual inspection of the valve and its connections
Check the integrity of the wiring harness and contacts
Test valve resistance and operation
Clean or replace faulty valve
Reset the error code and take a test drive

Related codes

P0440 P0441 P0456