P0496
Evaporative emission system flow during non-purge condition
The ECU has detected EVAP vapour flow when purge should not be occurring.
What this code means
The ECU has detected EVAP vapour flow when purge should not be occurring.
Possible causes
- Purge valve stuck open
- Faulty purge control circuit
- EVAP pressure sensor issue
- Hose routing problem
Common symptoms
- Check engine light
- Hard starting after refuelling
- Rough idle in some vehicles
Checks to make
- Check purge valve for leakage when commanded closed
- Inspect EVAP hoses
- Review tank-pressure data if available
Safety
- Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.
Model notes
The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.