P0447 EVAP vent control circuit is open (no proper signal from the vent valve circuit)

EVAP vent control circuit open

Monitor

TroubleCodes.net lists a lit check engine light with at most slightly reduced performance and fuel economy, so it can usually be driven while you book a check.

It gets more serious if:

  • Inspect soon: Inspect soon if you smell fuel, since TroubleCodes.net says a vent valve stuck open can let fuel vapor out.

Source: how we rate severity

P0447 in short

P0447 means the computer sees an open circuit in the EVAP vent control valve circuit. A broken wire, corroded connector or failed vent valve is the usual cause, and a blocked vent line can also set it. The car usually drives normally, though fuel economy may dip slightly and the light stays on.

The EVAP system traps fuel vapor in a charcoal canister. When the engine computer purges that vapor into the engine, it also opens the vent control valve so fresh air can replace it. The computer watches the electrical feedback from the vent control circuit.

If that feedback shows an open circuit, it stores P0447. TroubleCodes.net and the Delaware DMV list both describe it as the EVAP vent control circuit open.

Wiring and connector faults come first. A Kia Sorento owner reports a broken wire that was repaired and the code returned. A Nissan Quest owner replaced the vent valve without a fix and found corrosion on the engine computer. Jaguar has a bulletin for 2010-2015 XJ models where water or ice in a leak-detection pump filter can set P0447 with other EVAP codes.

Most likely causes

  1. Vent control valve solenoid that has failed

    Common general cause
    Why it ranks here
    TroubleCodes.net lists a faulty vent control valve solenoid. Hyundai also has a bulletin that points to the canister close valve as a possible cause for P0446, P0447 and P0448.
    What would change this
    Rises if the valve does not click or hold vacuum when energized, or its resistance is out of range. Falls if the valve works and the wiring is bad.
    How to test the evap canister vent valve

  2. Open or damaged wiring, or a corroded connector

    Common general cause
    Why it ranks here
    TroubleCodes.net lists wiring open circuit and corroded connectors. A Kia Sorento owner reports a broken wire behind the code that returned after repair.
    What would change this
    Rises if a wire is broken or a connector is corroded. Falls if the circuit tests continuous with a good connector.

  3. Corroded engine computer or its connector (owner report)

    Possible — needs testing
    Why it ranks here
    A Nissan Quest owner replaced the vent valve without a fix and found rust and corrosion on the engine computer under the leaf screen. This is one owner report, so it ranks low.
    What would change this
    Rises if the vent valve and wiring test good and corrosion is visible at the computer. Falls if the computer and connector are clean.
    How to test the engine control module (ecm / pcm)

  4. Blocked vent line, damaged canister or hoses, or gas cap problem

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net lists clogged EVAP vents (including spider nests), damaged hoses, tubes or canister, and a loose or wrong gas cap. These more often set other EVAP codes, so they rank below the circuit causes.
    What would change this
    Rises if the vent line is blocked or a hose is damaged. Falls if airflow through the vent is clear.
    How to test the evap charcoal canister

  5. Water or ice in the leak-detection pump filter (2010-2015 Jaguar XJ)

    Supported by vehicle data
    Why it ranks here
    Jaguar bulletin JTB00436NAS1 says water or ice from tire spray can be trapped in the DMTL pump filter, with P0447-00 among the codes. It applies to one model only.
    What would change this
    Rises on a 2010-2015 XJ after wet or cold weather. Falls on any other vehicle.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and freeze-frame data with a scan tool, and note any other EVAP codes stored with P0447.

    Low riskTool: OBD-II scan tool

    • IfOther EVAP codes such as P0446 or P0448 are stored

      It meansThe vent valve circuit is the common point.

      Go to step 2

    • IfP0447 is the only code

      It meansInspect the vent valve and its wiring.

      Go to step 2

  2. With the engine off, check the gas cap seals and clicks, look over the EVAP hoses and vent line for damage or a blockage, and check the vent valve connector for corrosion or a broken wire.

    Low risk

  3. Have the vent control valve tested with a vacuum pump, since it should hold vacuum when closed and release it when energized, and have its resistance measured. TroubleCodes.net gives about 30-40 ohms for older valves and 2-6 ohms for newer ones.

    Use cautionTool: vacuum pump, multimeter

    Warning:The valve sits near the fuel tank and fuel vapor lines. Keep sparks and open flames away, and support the car safely if it is raised.

  4. Have the wiring between the engine computer and the vent valve tested for an open circuit, and check the computer connector for corrosion.

    Best left to a shopTool: multimeter

    Warning:Disconnect the battery before probing computer connectors, and avoid damaging pins; this is shop work.

Symptoms

  • Check engine light on
  • Slightly reduced performance or fuel economy
  • Fuel smell, if the vent valve is stuck open Gets more serious: stop and have it checked.
  • Other EVAP codes stored at the same time

How to fix

  1. Check that the gas cap is seated and clicks, and that its seal is not cracked.

  2. With the engine off, look over visible EVAP hoses and the vent valve connector for damage or corrosion.

Parts and cost context

  • EVAP canister vent valve:Replace the vent valve only after testing it and the wiring. An owner reports the new valve not curing the code. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Jaguar

  • 2010–2015 · XJ

    Supported by vehicle data

    Jaguar bulletin JTB00436NAS1 says water or ice trapped in the DMTL pump filter can set P0447-00 and other EVAP codes. Whether it is still current is not verified.

  • JTB00436NAS1Status unverified

    MIL with EVAP DTCs including P0447-00

    2010–2015xj · issued · NHTSA 10096676

    Water or ice from tire spray can become trapped in the DMTL pump filter, and the summary lists P0447-00 among the codes. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Nissan

  • 2002–2005 · Altima

    Supported by vehicle data

    Nissan bulletin 05053 lists P0447 among the codes on the Altima. Whether it is still current is not verified.

  • 2004 · Quest

    Possible — needs testing

    An owner of a 2004 Quest reports P0447 not fixed by a new vent valve, and corrosion on the engine computer. This is an owner report, not a verified repair.

  • 05053Status unverified

    MIL on with P0444, P0447, P0605, P1122, P1444, P1490

    2002–2005altima · issued · NHTSA 10017563

    Service information for an Altima that stores P0447 with several other codes. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Kia

  • 2015 · Sorento

    Possible — needs testing

    An owner of a 2015 Sorento reports P0447 caused by a broken wire, and the code returned after the repair. This is an owner report, not a verified repair.

  • P0446EVAP vent control performance problem

    Same system Supported by vehicle data

    P0446 is the vent control circuit malfunction code. Hyundai groups P0446, P0447 and P0448 together as pointing to the canister close valve, among other causes.

  • P0448EVAP vent valve circuit shorted

    Same system Supported by vehicle data

    P0448 is the vent control circuit shorted code. It is the short counterpart of P0447.

All EVAP (evaporative emissions) codes

P0447 questions

Can a loose gas cap cause P0447?

TroubleCodes.net lists it, but P0447 is an electrical circuit code, so check the wiring and vent valve too.

Sources and review

  1. TroubleCodes.net DTC pages (P0342, P0385, P0394, P0400, P0431, P0447; P0413, P0414, P0416, P0417 read but not used) — TroubleCodes.net
  2. Hyundai 7/1/B: emissions diagnostics, power control DTCs P0446, P0447 and P0448 — Hyundai / NHTSA ,
  3. NHTSA complaint ODI 11420916: 2015 Kia Sorento — NHTSA Office of Defects Investigation (consumer complaint)
  4. NHTSA complaint ODI 10583466: 2004 Nissan Quest — NHTSA Office of Defects Investigation (consumer complaint)
  5. Jaguar JTB00436NAS1: MIL with EVAP DTCs including P0447-00 (2010-2015 XJ) — Jaguar / NHTSA ,
  6. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
  7. Nissan 05053: MIL on with P0444, P0447, P0605, P1122, P1444, P1490 (2002-2005 Altima) — Nissan / NHTSA ,
Last reviewed
Written by
Saurabh K.
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