PowertrainP0499
CautionSeverity: Caution - get it checked when you can
EVAP System Vent Valve Control Circuit High
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 29
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0499 | EVAP System Vent Valve Control Circuit High SAE | Powertrain |
| BAIC Motor | P0499 | Canister vent valve circuit short to high voltage Brand | Powertrain |
| BYD | P0499 | Canister emission device control circuit voltage too high Brand | Powertrain |
| Chery | P0499 | EVAP Canister Solenoid Valve 2 (N115) Signal too High Brand | Powertrain |
| Daewoo | P0499 | Fuel Tank Ventilation Valve Voltage High Brand | Powertrain |
| DFFS | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| DFFX | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| DFXK | P0499 | Ventilation solenoid circuit short to high voltage Brand | Powertrain |
| EOBD | P0499 | EVAP-system lufteventil styrekrets høy Brand | Powertrain |
| Geely | P0499 | EVAP Canister Solenoid Valve 2 (N115) Signal too High Brand | Powertrain |
| GM | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Great Wall | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Hafei | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Holden | P0499 | Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit High Voltage Brand | Powertrain |
| Honda | P0499 | EVAP System Vent Valve Control Circuit High SAE | Powertrain |
| Hyundai | P0499 | EVAP System Vent Valve Control Circuit High SAE | Powertrain |
| Isuzu | P0499 | EVAP System Vent Valve Control Circuit High SAE | Powertrain |
| Land Rover | P0499 | EVAP System Vent Valve Control Circuit High Brand | Powertrain |
| Mitsubishi | P0499 | EVAP. emission vent SOL. High Brand | Powertrain |
| Opel | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Peugeot | P0499 | EVAP System Vent Valve Control Circuit High SAE | Powertrain |
| Porsche | P0499 | SOV - SYM0 Brand | Powertrain |
| Proton | P0499 | EVAP. emission vent SOL. High Brand | Powertrain |
| Saab | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| MG (SAIC) | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Suzuki | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| SWM Motor | P0499 | Canister stop valve control circuit short circuit to high voltage Brand | Powertrain |
| Tata | P0499 | Evaporative Emission System Vent Valve Control Circuit High Brand | Powertrain |
| Toyota | P0499 | Canister ventilation solenoid valve circuit short to high voltage 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 P0499 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P049900 | Canister shut-off valve signal high Brand | Powertrain |
6Related codes
Browse Pxxx codes or P049xx codes.