PowertrainP0457
CautionSeverity: Caution - get it checked when you can
Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
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 | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| BAIC Motor | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Mercedes-Benz | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| BMW | P0457 | Evaporative Emission Contr. Syst. Leak Detected (fuel cap Loose/off) Brand | Powertrain |
| BYD | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Chery | P0457 | SAE: Evap System Leak Detected Brand | Powertrain |
| Chrysler | P0457 | Fuel tank cap open Brand | Powertrain |
| Daewoo | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| DFFS | P0457 | Fuel cap not closed Brand | Powertrain |
| DFFX | P0457 | Fuel tank cap not closed fault Brand | Powertrain |
| DFXK | P0457 | SAE: Evap System Leak Detected Brand | Powertrain |
| EOBD | P0457 | EVAP system leak detected Brand | Powertrain |
| Ford | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Geely | P0457 | SAE: Evap System Leak Detected Brand | Powertrain |
| GM | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Great Wall | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Hafei | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Holden | P0457 | Evaporative Emission (EVAP) System Fuel Cap Leak Detected Brand | Powertrain |
| Honda | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Hyundai | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Isuzu | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Land Rover | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Maserati | P0457 | Evaporative Emission (EVAP) system fuel cap loose Brand | Powertrain |
| Mazda | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Opel | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Peugeot | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Porsche | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Proton | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Saab | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| MG (SAIC) | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Smart | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Sprinter | P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) SAE | Powertrain |
| Subaru | P0457 | EVAP Control System Leak Detected Brand | Powertrain |
| Suzuki | P0457 | Evaporative Emission System Leak Detected (fuel cap loose/off) Brand | Powertrain |
| Tata | P0457 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Toyota | P0457 | Fuel cap not closed Brand | Powertrain |
| Volkswagen | P0457 | EVAP system: leak detected (check fuel cap!); Implausible signal 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 3
These 7-character codes are manufacturer-specific variants of P0457 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Volkswagen | P045700 | No description available | Powertrain |
| Mercedes-Benz | P045709 | Leakage in the evaporative emission control system was detected (tank cap missing). There is a component fault. Brand | Powertrain |
| Mercedes-Benz | P04577A | Leakage in the evaporative emission control system was detected (tank cap missing). Leakage or a defective seal was detected. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P045xx codes.