What causes a purge valve failure?
©, 2023 Rick Muscoplat
Posted on by Rick Muscoplat
A short or open in the solenoid windings would set a purge valve circuit code.That kind of purge valve failure would set a check engine light and one of these trouble codes
A purge valve has two vacuum line ports; one vacuum line supplies fuel vapor form the charcoal canister. The other port is connected to the intake manifold or throttle body. Remove the vacuum line running to the intake or throttle body. Apply vacuum to this port and see if the purge valve holds vacuum. Then apply power and ground to the electrical terminals to see if the purge valve opens and closes properly. Also, check for charcoal granules in the valve. That’s an indication of a failed charcoal canister. If you find charcoal, you must replace the canister and flush the lines. If you replace just the clogged purge valve, it will just plug up again.
A purge valve is just a solenoid operated valve. The solenoid move a plunger that opens or closes the valve. So it can fail electrically or mechanically. Here’s what causes a purge valve failure:
P0443 – Evaporative Emission Control System Purge Control Valve Circuit
P0444 – Evaporative Emission Control System Purge Control Valve Circuit Open
P0445 – Evaporative Emission Control System Purge Control Valve Circuit Shorted