PowertrainP0449
CautionSeverity: Caution - get it checked when you can
Evaporative Emission Control System Vent Valve/Solenoid 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 30
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0449 | Aftertreatment 1 Diesel Exhaust Fluid Dosing Temperature - Rationality Error Brand | Powertrain |
| BAIC Motor | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| Mercedes-Benz | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| BMW | P0449 | Evaporative Emission Contr. Syst. Vent Valve/Solenoid Circuit Brand | Powertrain |
| BYD | P0449 | Canister shut-off valve control circuit high Brand | Powertrain |
| Chery | P0449 | Canister flushing valve output circuit fault Brand | Powertrain |
| Daewoo | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| DFFS | P0449 | Evaporation system ventilation valve open circuit Brand | Powertrain |
| DFFX | P0449 | Evaporation system ventilation valve open circuit Brand | Powertrain |
| DFXK | P0449 | Canister purge valve output circuit fault Brand | Powertrain |
| EOBD | P0449 | EVAP-system ventilkontrollkrets/öppen Brand | Powertrain |
| Geely | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| GM | P0449 | Circuit de commande de soupape d'aération EVAP Brand | Powertrain |
| Great Wall | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| Hafei | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| Holden | P0449 | Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit Brand | Powertrain |
| Honda | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Hyundai | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Isuzu | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Land Rover | P0449 | EVAP System Vent Valve Control Circuit/Open Brand | Powertrain |
| Nissan | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Opel | P0449 | Circuit de commande de soupape d'aération EVAP Brand | Powertrain |
| Peugeot | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Proton | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Saab | P0449 | Circuit de commande de soupape d'aération EVAP Brand | Powertrain |
| MG (SAIC) | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| Smart | P0449 | Evaporative Emission Control System Vent Valve/Solenoid Circuit SAE | Powertrain |
| Suzuki | P0449 | Evaporative emission control system vent valve/solenoid circuit Brand | Powertrain |
| Tata | P0449 | Evaporative Emission System Vent Valve/Solenoid Circuit Brand | Powertrain |
| Toyota | P0449 | Evaporation system ventilation valve open circuit 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.
5Extended variant codes 1
These 7-character codes are manufacturer-specific variants of P0449 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P044900 | EVAP. emission system - vent valve / solenoid circuit Brand | Powertrain |
6Related codes
Browse Pxxx codes or P044xx codes.