OBD-II Generic Error Code P0499: How to Fix It

Q: Can I drive with error code P0499?

Yes, in most cases you can drive short distances, but the check engine light will be on and your vehicle may fail an emissions test. It is best to repair the issue promptly to avoid further damage.

Q: What causes code P0499?

Common causes include a faulty EVAP vent valve, a short to voltage in the control circuit, damaged wiring or connectors, or a blown fuse. Less common causes include a defective PCM.

Q: How to clear code P0499?

You can clear the code using an OBD2 scanner after performing the necessary repairs. Simply turning off the battery may clear it temporarily, but the code will return if the issue is not fixed.

Q: Is P0499 a serious code?

It is a medium-severity code. While it does not affect engine performance immediately, it can lead to increased emissions and may prevent the vehicle from passing an emissions test.

Q: Can a bad fuse cause P0499?

Yes, a blown fuse in the EVAP vent valve circuit can cause the control signal to be high, triggering code P0499. Check the fuse box for a blown fuse related to the EVAP system.

Abstract

Error code P0499 means the powertrain control module (PCM) has detected a high voltage signal from the evaporative emission (EVAP) vent valve control circuit. This typically indicates an electrical fault such as a short to voltage, a faulty vent valve, or a wiring issue. While the vehicle may still be drivable, it can cause the check engine light to illuminate and may fail an emissions test.