P0455 on Porsche
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Porsche vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 1 Porsche model — most commonly on Macan. This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor.
Common Causes of P0455
- •Loose, missing, or improperly tightened gas cap
- •Worn, cracked, or failed gas cap seal
- •Cracked or disconnected EVAP/vapor hose
- •Damaged or missing fuel filler neck seal
- •Faulty EVAP purge valve stuck open
- •Failed EVAP vent valve
- •Cracked or damaged charcoal canister
P0455 on Porsche by Model
Porsche Macan(1 issue)
- Fuel Pump Flange Crack and Fuel Leak (Recall ALA2 / NHTSA 20V077000)2015-2018
Porsche recall ALA2 / NHTSA 20V077 covers 70,117 potentially affected 2015-2018 Macan variants. Under load, the fuel-pump service cover can contact the flow nozzle on the filter flange; over time the nozzle can develop hairline cracks that permit fuel seepage and odor. Fuel leakage near an ignition source increases fire risk. Recall applicability is VIN-specific even though the indexed year range matches the campaign population.
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View P0455 across all makes →Frequently Asked Questions
What does P0455 mean on Porsche?▼
P0455 stands for "Evaporative Emission Control System Leak Detected (Gross Leak)." This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor. On Porsche specifically, this code is documented across 1 model.
What causes P0455 on Porsche vehicles?▼
Common causes on Porsche: Loose, missing, or improperly tightened gas cap, Worn, cracked, or failed gas cap seal, Cracked or disconnected EVAP/vapor hose, Damaged or missing fuel filler neck seal, Faulty EVAP purge valve stuck open. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0455 on a Porsche?▼
Repair costs vary widely depending on the root cause and specific Porsche model.
Which Porsche models have P0455 documented?▼
Au7o has documented P0455 on 1 Porsche model: Macan.