Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0446EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL MALFUNCTION
P0446EVAP CANISTER VENT
P0446EVAPORATIVE EMISSIONS (EVAP) VENT SYSTEM PERFORMANCE (INSPECT/CLEAN EVAP CANISTER VENT VALVE SOLENOID AND INSTALL SCREEN)
Manufacturer communications
73Original wording in English
CHEVROLET, GMC
This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
VOLVO
This is a Technical Journal: Check Engine Light, DTC P044671. Do not replace any parts. This is not a hardware-related fault
CHEVROLET, GMC
This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
VOLVO
This is a Technical Journal: Check Engine Light, DTC P044671. Do not replace any parts. This is not a hardware-related fault
Check vehicle applicability
316A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Evaporative Emission Control System Vent Control Circuit Malfunction
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.