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To test: Remove hoses from either side of the charcoal canister vent control valve with the key and engine off, unplug it from the vehicle, and remove it from the vehicle. It can get sticky, causing leaks, or the internal solenoid can fail and not operate properly. This valve is normally not powered on and when at rest, with no power source applied, allows air to pass through. Check the charcoal canister vent control valve for proper operation.(Tech Tip- The purge volume control valve is usually under the hood near the airbox or intake manifold.) If you canвЂ™t blow through them, they are sealing properly and are most likely not the cause of this small evap leak. Blow through openings with no power supplied. To test: Remove hoses from either side of the purge volume control valve with the key and engine off. This valve is normally not powered on and when at rest, with no power source applied, does not allow air to pass through. Check the purge volume control valve for proper operation.Inspect the fuel tank and charcoal canister for damage and leaks.

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Check for cracked or disconnected EVAP hoses near or connected to the engine air box.

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Gas caps are relatively inexpensive and are often the fix for code P0456. If your gas cap was not loose and you do not see any indications of failure, try replacing the gas cap anyway and clearing the codes. However, it should be noted that damage to the gas cap or deterioration of its components is not always noticeable. Inspect your gas cap for physical damage or deterioration. If your gas cap is loose, tighten it and clear the code.

Inspect your gas cap to see if it is loose or damaged.

If it is paired with P0441, P0440, and/or P0446, there is most likely a solenoid failure, leaking charcoal canister, or a more complex EVAP leak. If other codes are present regarding fuel pressure or the fuel system, repair and diagnose those first.

Scan your vehicle to verify P0456 is the only code present.

Be sure to check if your vehicle has any technical service bulletins available to save time diagnosing and or misdiagnosing the car. Also, many manufacturers have technical service bulletins regarding EVAP codes. The P0456 small leak is a bit trickier to diagnose.

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Many assume that a loose fuel cap is the only problem and does not perform all the tests necessary to diagnose the full EVAP system. However, as with all check engine lights, it is recommended that you get it fixed as soon as possible so the engine can be running at the proper specifications to prevent further damage.

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It is unlikely the driver will notice any symptoms with check engine light code P0456 other than a slight odor of fuel, a slight decrease in fuel economy, and the check engine light. In the case of P0456, it is a small-sized leak, smaller than. If the EVAP system does not maintain the pressure, the ECM recognizes an evaporative emission control leak. During the leak test, the ECM closes the vent control valve and purge valve to seal the evaporative system. However, when the vehicle is turned off the ECM performs a leak test to ensure the evaporative emission control system is working properly. The vent control valve is usually open when the engine is at normal operating temperature, and the purge volume control valve is commanded on when the ECM is ready to burn the built-up fuel vapors. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge volume control valve. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. Evaporative emission control system leak (small).