Diagnostic Trouble Code
P0447
Evaporative Emission Control System Vent Valve/Solenoid Circuit Open
Technical Description P0447
Evaporative Emission Control System Vent Valve/Solenoid Circuit Open
What Does This Mean P0447?
The Powertrain Control Module (PCM) has detected an open within the circuit that controls the vent valve or solenoid for evaporative emission systems vapor.
As fuel sits in the tank it lets out fuel vapor, while driving this vent opens and allows the vapors to be circulated into the engine intake manifold, a charcoal canister or into the atmosphere, depending on the vehicle. This vent valve is apart of the simple, yet complicated evaporative emissions system.
As fuel sits in the tank it lets out fuel vapor, while driving this vent opens and allows the vapors to be circulated into the engine intake manifold, a charcoal canister or into the atmosphere, depending on the vehicle. This vent valve is apart of the simple, yet complicated evaporative emissions system.
Possible Causes P0447
1
Faulty vent valve
2
Wire/circuit issue
3
PCM fault
Solutions & Repair Steps P0447
Some steps to take to diagnose and repair this trouble code include the following:
Check your fuses, there may be a fuse that powers the vent solenoid.
Check for a rubbed-through or chafed wiring harness. Check both wires to see if they are Open to each other, to ground or power.
Visually inspect the vent valve for cracks or damage.
Trace the wires to and from the PCM and check for continuity continuity using a digital volt ohm meter (DVOM).
If you have access to an advanced level scan tool, actuate the valve while reading power and ground at the connector or by simply using a bulb wired to both terminals, it will light up if power and ground are OK.
Using a DVOM, check the resistance of the vent, in most cases the resistance reading should be low, refer to the manufacturer’s specification or compare it to a new one. Too high or low a value indicates a faulty coil inside the valve, thusly meaning replacement is necessary. This code seems to be prevalent on Dodge, Chrsyler, and Jeep products. In those cases the vent valve was bad. With GM products (specifically pickups), GM has released a new updated valve assembly.
Finally, remove the valve, you may be able to access the pintle inside and it simply could just be sticking from fuel residue. Clean it and retest.
Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0446 - P0448 - P0449 - P0452 - P0453 - P0455 - P0456
Check your fuses, there may be a fuse that powers the vent solenoid.
Check for a rubbed-through or chafed wiring harness. Check both wires to see if they are Open to each other, to ground or power.
Visually inspect the vent valve for cracks or damage.
Trace the wires to and from the PCM and check for continuity continuity using a digital volt ohm meter (DVOM).
If you have access to an advanced level scan tool, actuate the valve while reading power and ground at the connector or by simply using a bulb wired to both terminals, it will light up if power and ground are OK.
Using a DVOM, check the resistance of the vent, in most cases the resistance reading should be low, refer to the manufacturer’s specification or compare it to a new one. Too high or low a value indicates a faulty coil inside the valve, thusly meaning replacement is necessary. This code seems to be prevalent on Dodge, Chrsyler, and Jeep products. In those cases the vent valve was bad. With GM products (specifically pickups), GM has released a new updated valve assembly.
Finally, remove the valve, you may be able to access the pintle inside and it simply could just be sticking from fuel residue. Clean it and retest.
Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0446 - P0448 - P0449 - P0452 - P0453 - P0455 - P0456