PowertrainP0446
CautionSeverity: Caution - get it checked when you can
Evaporative Emission Control System Vent Control Circuit
Key terms: Catalytic converter: cleans the exhaust gases · EGR: exhaust gas recirculation, which cuts harmful gases · EVAP: the system that traps fuel vapour · Oxygen sensor: measures oxygen in the exhaust gas · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
This range covers emissions control (EGR, EVAP, oxygen sensors and the catalytic converter), but some manufacturers also use P04 codes for oil-pressure, brake-fluid and coolant-level warnings.
2Common causes
- Clogged or faulty EGR valve
- EVAP system leak (hoses, canister, fuel cap)
- Faulty oxygen sensor
- Ageing catalytic converter
- Low oil, brake fluid or coolant (on some models)
- Wiring or connector fault
3Can I drive?
Do not assume this code is safe to drive. Check the description: if it names oil pressure, brake fluid, coolant, or a brake fault, stop safely and have it diagnosed before driving. Emissions-only codes (EGR, EVAP, catalyst) should still be checked before an emissions or roadworthiness inspection.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 37
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| BAIC Motor | P0446 | Evaporative Emission System Vent Control Circuit Brand | Powertrain |
| Mercedes-Benz | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| BMW | P0446 | EVAP Purge Flow Sensor Circ. Range/Performance Brand | Powertrain |
| BYD | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Chery | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Chrysler | P0446 | Charcoal canister shut-off valve short to ground Brand | Powertrain |
| Daewoo | P0446 | A/C Relay Voltage Low Brand | Powertrain |
| DFFS | P0446 | Ventilation control valve fault Brand | Powertrain |
| DFFX | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| DFXK | P0446 | Canister shut-off valve control circuit fault Brand | Powertrain |
| EOBD | P0446 | EVAP sistem ventilacioni krug Brand | Powertrain |
| Ford | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Geely | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| GM | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Great Wall | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Hafei | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Holden | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Hyundai | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Isuzu | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Land Rover | P0446 | Canister vent valve circuit Brand | Powertrain |
| Mazda | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Mitsubishi | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Nissan | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Opel | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Peugeot | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Porsche | P0446 | Aktivkohlefilter-Absperrventil Brand | Powertrain |
| Proton | P0446 | EVAP. emission vent solenoid Brand | Powertrain |
| Saab | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| MG (SAIC) | P0446 | Evaporative Emission System Vent Control Circuit Brand | Powertrain |
| Smart | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Sprinter | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Subaru | P0446 | Evaporative Emission Control System Vent Control Circuit SAE | Powertrain |
| Suzuki | P0446 | Evaporative emission control system vent control circuit Brand | Powertrain |
| Tata | P0446 | Evaporative Emission System Vent Control Circuit Brand | Powertrain |
| Toyota | P0446 | Canister solenoid valve circuit open Brand | Powertrain |
| Volkswagen | P0446 | SAE: Evap System Vent Control Circuit Malfunction Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Related codes
Browse Pxxx codes or P044xx codes.