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. 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.Repair Urgency: Get this fixed within the next month to prevent drivability problems and excessive fuel consumption.Issue Severity: LOW – Continued driving for a short period of time is okay.Jeep Grand Cherokee P0456 definition: Evaporative emission control system leak (small).What Does Jeep Grand Cherokee Code P0456 Mean?
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