P0456 on Volkswagen
Evaporative Emission Control System Leak Detected (Very Small Leak)
P0456 on Volkswagen vehicles indicates evaporative emission control system leak detected (very small leak). Au7o has documented this code across 1 Volkswagen model — most commonly on Golf R. This emissions code means the evaporative emission (EVAP) control system has detected a very small leak — even tinier than the one flagged by P0442, roughly equivalent to a 0.020-inch hole. The EVAP system traps fuel vapors from the tank and prevents them from escaping into the atmosphere, and the computer tests for leaks by sealing the system and watching for pressure or vacuum loss. Because the leak is so small, the cause is often subtle, but a loose or worn gas cap is still the most common and easiest to check. It generally indicates a minor seal, hose, or valve leak somewhere in the fuel vapor system. Typical repair costs on Volkswagen range from $30 to $500, depending on the specific model and root cause.
Common Causes of P0456
- •Loose, worn, or faulty gas cap or cap seal
- •Cracked or loose EVAP hose or line
- •Leaking vent valve or purge valve not sealing
- •Damaged O-ring or seal at the fuel filler neck
- •Small crack or leak in the charcoal canister
- •Leaking fuel tank or sending unit gasket
- •Loose or corroded EVAP component connection
P0456 on Volkswagen by Model
Volkswagen Golf R(1 issue)
- EVAP N80 Purge Valve Failure and Large/Small Leak Codes2015-2022
The EVAP system on MQB-platform Golf R (MK7/MK7.5, with some MK8 cases) frequently throws evaporative-emissions leak faults. The most common culprit is the N80 purge valve failing to seal, but the leak-detection pump, carbon (charcoal) canister breakdown, and saturated canister from overfilling the tank also trigger codes. Symptoms are a check engine light with small- or large-leak codes, occasional rough idle or hesitation just after start, and sometimes a fuel smell. Often surfaces around emissions/inspection (relevant for EU periodic technical inspection).
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View P0456 across all makes →Frequently Asked Questions
What does P0456 mean on Volkswagen?▼
P0456 stands for "Evaporative Emission Control System Leak Detected (Very Small Leak)." This emissions code means the evaporative emission (EVAP) control system has detected a very small leak — even tinier than the one flagged by P0442, roughly equivalent to a 0.020-inch hole. The EVAP system traps fuel vapors from the tank and prevents them from escaping into the atmosphere, and the computer tests for leaks by sealing the system and watching for pressure or vacuum loss. Because the leak is so small, the cause is often subtle, but a loose or worn gas cap is still the most common and easiest to check. It generally indicates a minor seal, hose, or valve leak somewhere in the fuel vapor system. On Volkswagen specifically, this code is documented across 1 model.
What causes P0456 on Volkswagen vehicles?▼
Common causes on Volkswagen: Loose, worn, or faulty gas cap or cap seal, Cracked or loose EVAP hose or line, Leaking vent valve or purge valve not sealing, Damaged O-ring or seal at the fuel filler neck, Small crack or leak in the charcoal canister. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0456 on a Volkswagen?▼
Repair costs on Volkswagen range from $30 to $500, depending on the specific model and root cause.
Which Volkswagen models have P0456 documented?▼
Au7o has documented P0456 on 1 Volkswagen model: Golf R.