The p0456 code is a generic OBD-II code that indicates a small leak in the evaporative emission control system (EVAP). The EVAP system captures and recirculates fuel vapors from the fuel tank and engine. This code may be caused by a loose or damaged gas cap, a faulty canister purge solenoid, a faulty canister vent solenoid, or a faulty canister.
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1. Check the gas cap to make sure it is on correctly and tight
- Open the hood of the car and locate the gas cap.
- Remove the gas cap.
- Check the gas seal on the cap. If it is damaged, replace the gas cap.
- Reconnect the gas cap to the gas tank.
- Close the hood of the car.
- Start the car and check for leaks.
2. Inspect the EVAP system for leaks
- Verify the proper system operation by checking the air/fuel ratio, engine temperature and fuel pressure.
- Check for any fluid leaks by using a scan tool and checking for leaks at the air intake, air cleaner, fuel rail, and injectors.
- If possible, remove the fuel rail and injectors for inspection.
- Check for any fluid leaks at the coolant reservoir, radiator, and engine.
- If necessary, replace any faulty parts.
3. Check for any loose or damaged hoses or components in the EVAP system
- Remove the front bumper and unscrew the Phillips head screws that hold the front fascia on.
- Remove the front grille.
- Remove the four screws that hold the evaporator duct in place.
- Lift the evaporator duct out of the way.
- Check for any loose or damaged hoses or components. If there are any problems, replace the damaged hoses or components.
4. Have the EVAP system tested for leaks
- Remove the air ducts.
- Inspect the EVAP system for any leaks.
- Replace any leaking parts.
- Reinstall the fuel tank and air ducts.
5. Replace any damaged or leaking parts in the EVAP system
- Remove the EVAP system cover.
- Remove the EVAP system pan.
- Remove the EVAP system hose.
- Remove the EVAP system valve.
- Replace any damaged or leaking parts.
- Reinstall the EVAP system cover, pan, hose, and valve.