PowertrainP0456
InfoSeverity: Info - usually nothing urgent
Evaporative Emission Control System Leak Detected (Very Small Leak)
Key terms: EVAP: the system that traps fuel vapour · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The fuel vapour (EVAP) system has a very small leak, similar to a pinhole.
2Common causes
- Loose or faulty fuel cap seal
- Small leak in an EVAP hose or connection
- Faulty purge or vent valve seal
- Cracked charcoal canister
- Faulty fuel tank pressure sensor
3Can I drive?
Safe to drive; this only affects fuel vapour emissions. Check that the fuel cap is tight and have it checked before an emissions test.
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 43
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| BAIC Motor | P0456 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Mercedes-Benz | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| BMW | P0456 | Minimal leak Brand | Powertrain |
| BYD | P0456 | 0.5mm leak fault Brand | Powertrain |
| Chery | P0456 | EVAP. emission Brand | Powertrain |
| Chrysler | P0456 | EVAP System Leak Detected Brand | Powertrain |
| Daewoo | P0456 | Evaporative Emission System Leak Detected Brand | Powertrain |
| DFFS | P0456 | Evaporative Emission System Leak Detected Brand | Powertrain |
| DFFX | P0456 | EVAP. emission Brand | Powertrain |
| DFXK | P0456 | EVAP System: Very Small Leak Detected Brand | Powertrain |
| EOBD | P0456 | Leak EVAP detected Brand | Powertrain |
| Fiat | P0456 | Test Failed because the ESIM Switch state never changed. The ESIM Switch may be the root cause of Brand | Powertrain |
| Ford | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Geely | P0456 | EVAP. emission Brand | Powertrain |
| GM | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Great Wall | P0456 | EVAP. emission Brand | Powertrain |
| Hafei | P0456 | EVAP. emission Brand | Powertrain |
| Holden | P0456 | Evaporative Emission (EVAP) System Very Small Leak Detected Brand | Powertrain |
| Honda | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Hyundai | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Isuzu | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Land Rover | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Mahindra | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Maserati | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Mazda | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Mitsubishi | P0456 | EVAP. leak check:0.5mm leak Brand | Powertrain |
| Nissan | P0456 | EVP V/S leakage /P1456 Brand | Powertrain |
| Opel | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Peugeot | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Porsche | P0456 | If the value is 0, the fault memory can be check for the current fault entry Brand | Powertrain |
| Proton | P0456 | EVAP. leak check:0.5mm leak Brand | Powertrain |
| Renault | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Saab | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| MG (SAIC) | P0456 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Smart | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| Sprinter | P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) SAE | Powertrain |
| SsangYong | P0456 | EVAP. emission system - leak detected (very small leak) Brand | Powertrain |
| Subaru | P0456 | EVAP Control System Leak Detected Brand | Powertrain |
| Suzuki | P0456 | Evaporative emission system leak detected (very small leak) Brand | Powertrain |
| Tata | P0456 | Evaporative Emission System Leak Detected Brand | Powertrain |
| Toyota | P0456 | EVAP system leak detected (very small leak) Brand | Powertrain |
| Volkswagen | P0456 | Rate based monitor evap numerator 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 2
These 7-character codes are manufacturer-specific variants of P0456 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Volkswagen | P045600 | Small leak detected in tank ventilation system Brand | Powertrain |
| Mercedes-Benz | P045604 | Feinstleck in der Kraftstoffverdunstungsanlage wurde erkannt. Es liegt ein interner Fehler vor. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P045xx codes.