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P0447 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0447 code indicates that there’s a component in the EVAP control system that is no longer functioning properly.
The EVAP system is part of the vehicle’s emissions controls and includes the fuel cap, fuel lines, charcoal canister, purge valve, fuel pressure and flow sensors, electrical wiring, connectors, vacuum lines, fuel tank and vapor hoses, among other components. A P0447 code means that the powertrain control module (PCM) has detected a reading from an EVAP sensor that is not in compliance with manufacturer’s specs, resulting in a stored trouble code and illuminated malfunction indicator lamp (MIL).
Often, a P0447 code will result in no noticeable symptoms other than an illuminated MIL. A P0447 code will be enough to cause a vehicle to fail an emissions inspection, however.
The evaporative emission control system (EVAP) captures fuel vapors that escape from the fuel tank and lines before they can make their way into the air. A charcoal storage reservoir, electrical solenoids and engine vacuum come into play to accomplish this. Flammable fuel vapors are trapped in the charcoal canister, which is supplied by plastic or metal hoses, and are then purged when the PCM enables the purge control solenoid.
When the engine is running, the purge control solenoid opens the purge control valve, allowing engine vacuum to draw fuel vapors back into the engine where they can be burned as fuel. On most vehicles the charcoal canister is located near the fuel tank, under the vehicle. The fuel vapor and vacuum lines are fairly long and are vulnerable to damage from road debris, age and the elements.
You will need a scanner/code reader, digital volt/ohmmeter (DVOM) and a smoke machine for diagnosis of this code.
Often, technicians replace EVAP system components when a vacuum leak or the fuel cap are at fault.
Problems leading to a P0447 code can mean failing an emissions test and adding hydrocarbon fumes to the atmosphere.
In many cases, a P0447 code is stemming from problems with the charcoal canister. Working your way from the fuel cap and charcoal canister, then moving on to the rest of the system can be a good approach for this code.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.