P0447 - EVAPORATIVE EMISSION CONTROL SYSTEM VENT VALVE / SOLENOID CIRCUIT OPEN

POST UPDATED IN October, 2020

Description of DTC code P0447 Generic

The DTC code P0447 OBD2 is set at the time the PCM (Powertrain Control Module) detects a short in the circuit that controls the vent valve or the solenoid for the EVAP (Evaporative Emission Control System).

When fuel settles in the tank, fuel vapor escapes while the vehicle is being driven. At the same time, a vent is opened allowing the vapors to circulate to the engine intake manifold to a carbon canister or the atmosphere, depending on the vehicle. It is separate from the EVAP.

Symptoms of fault code P0447 Generic

  • Malfunction indicator lamp illumination (Check Engine).
  • Fuel economy is reduced.
  • You can smell the fuel.
  • Other codes have been established for the EVAP

Causes of OBD2 P0447 Generic

The reasons for setting the error code P0447 OBDII are

  • The fuel or refueling cap may be misadjusted or defective.
  • The gas cap may not be the right one.
  • Ventilation valve electrical system components may be in poor condition.
  • The ventilation valve may be damaged.

Possible solutions of the DTC code P0447 Generic

The steps for correct diagnosis and repair of failures of the diagnostic code P0447 OBD2 are

  • Make sure the gas cap connection is in good condition. Also, check the condition of the cap. Make any necessary adjustments.
  • Check the fuses associated with the circuit. A fuse driving the vent solenoid may be defective, making it difficult for the valve to operate. Change as necessary.
  • Check the cables. If there are worn or damaged cables, you should repair or replace them.
  • Check the vent valve for visible damage such as cracks. Change it if it is.
  • Locate the wires from the valve to the PCM and verify continuity using a digital voltmeter.
  • If you have access to an advanced scanning tool, operate the valve while reading the power and ground connection on the valve connector. Repair if voltages are not adequate.
  • Use the voltmeter to check the resistance in the vent. The resistance level should be low. Compare the readings obtained with the technical data of the vehicle. If the resistance is too high, the coil inside the valve is defective, you must replace it.

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