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. ![]() One of the top 5 most common causes of a check engine light in 8 out of the 8 Jeep models we have data on.Use the FIXD Sensor and app to diagnose and fix P0456 yourself, see the most likely fix and cost for your Jeep, access our Mechanic Hotline, and more. 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. Diagnosis: 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. ![]()
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