P0499 Code - Evaporative Emission System Vent Valve Control Circuit High

Discussion in 'P - Powetrain Codes' started by fault code, Jan 22, 2018.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0499 Mean?

    Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above. When you see P0499 engine fault code on your engine code reader this description will help you.

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    What are the common causes of P0499 ?
    • The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
    • Fuel with a large percentage of sulfur will clog the DPF quickly
    • An air leak forward of the DPF will change the sensor readings resulting in the code


    How do you troubleshoot P0499 ?

    In order to fix the underlying issue causing the P0499 code, a mechanic has several options to explore. Those may include:
    • Properly installing the fuel cap.
    • Replacing a faulty purge control solenoid or valve.
    • Replacing a faulty EVAP canister vent valve.
    • Clearing a clogged charcoal canister.
    • Replacing a broken charcoal canister.
    • Repairing or replacing cracked or broken vacuum or fuel vapor hoses.
    • Replacing a faulty pressure sensor.
    • Replacing blown fuses. This repair may indicate that there is a larger issue that must be addressed and repaired.
    After each of these repairs has been attempted, it is important to clear the code from the PCM and perform a system retest. If the code does not reappear, the most recently performed repair was the root cause of the issue. This process helps mechanics narrow down intermittent issues and repair them quicker in the future should the issue return.

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