P0498 Code - Evaporative Emission System Vent Valve Control Circuit Low

What Does P0498 Mean?

OBD-II Code P0498 is defined as a Evaporative Emission System Vent Valve Control Circuit Low

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 P0498.

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What are the common causes of P0498 ?

These may include a faulty or improperly installed fuel cap, a faulty purge control solenoid, clogged or broken charcoal canister, broken or cracked vacuum or fuel vapor hoses, a faulty pressure or flow sensor, or a bad PCM. PCM failure is rare.

How do you troubleshoot P0498 ?

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

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