What Does P0499 Code Mean?

    OBD-II Code P0499 is defined as a Evaporative Emission System Vent Valve Control Circuit High

    The evaporative control (EVAP) system captures any fuel vapors from the fuel tank and sends them through the vehicle's intake to be burned in the normal combustion process. The EVAP Vent Valve allows fresh air to enter the EVAP system so it is not under a constant vacuum. When the engine control module (PCM) detects the evap system is venting when it should not, it will set code P0499.

    Common Problems That Trigger the P0499 Code

    • EVAP vent valve failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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