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Code

P0446

Evaporative emissions

EVAP vent valve control circuit malfunction

The EVAP vent valve circuit has a fault.

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Most likely causes

Faulty vent valve
Clogged vent line
Wiring fault

Symptoms you may notice

Check engine light

Checks to run

Test vent valve operation
Check wiring

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Evaporative emissions

Small leak in EVAP system

Large leak in EVAP system

Very small leak in EVAP system

EVAP pressure sensor high input

EVAP purge system flow during non-purge

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