P0455 on Honda
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Honda vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 1 Honda model — most commonly on Pilot. 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. Typical repair costs on Honda range from $30 to $250, depending on the specific model and root cause.
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 Honda by Model
Honda Pilot(1 issue)
- EVAP Canister Purge Valve Stuck Open (P0496/P0455) Causing Hard Start After Refueling2016-2022
The EVAP canister purge valve sticks open and allows fuel vapors to flow into the intake when they shouldn't. On 3rd-gen Pilots this commonly sets P0496 (EVAP high/incorrect purge flow), and can accompany P0455/P0441; drivers notice a check engine light, rough idle, and pronounced difficulty starting the engine immediately after filling up (flooded intake). The canonical OEM purge valve for these years is 36162-5G0-A01.
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What does P0455 mean on Honda?▼
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 Honda specifically, this code is documented across 1 model.
What causes P0455 on Honda vehicles?▼
Common causes on Honda: 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 Honda?▼
Repair costs on Honda range from $30 to $250, depending on the specific model and root cause.
Which Honda models have P0455 documented?▼
Au7o has documented P0455 on 1 Honda model: Pilot.