Can a malfunctioning purge control valve trigger the Check Engine Light CEL in a Prius?

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Can a malfunctioning purge control valve trigger the Check Engine Light CEL in a Prius?

Many Prius users report the CEL turning on due to emission system faults. How can one confirm if the purge control valve is the reason for the warning light?

Lubaba asked on 15 Feb 2025 11:49:02 am

1 Answer

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Car Mechanic Expert - on 15 Feb 2025 11:54:16 am

Yes: If the purge valve fails o r its performance is compromised, the ECU may trigger a diagnostic trouble code DTC related to the EVAP system, which will turn on the CEL. Common codes related to this are P0441 incorrect purge flow o r P0446 EVAP system vent control.
Confirmation: To confirm the purge valve is the issue, you can scan the car for trouble codes. If you see an EVAP-related code, its likely the purge valve is at fault.