P0455 on Toyota
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Toyota vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 5 Toyota models — most commonly on Corolla, FJ Cruiser, Highlander. 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 Toyota range from $20 to $2,500, 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 Toyota by Model
Toyota Corolla(1 issue)
- EVAP Charcoal Canister and Vent Valve Failure Causing Check Engine Light2000-2008
Corollas in the 9th-generation range commonly develop EVAP system faults from a failing charcoal canister, stuck vent valve, or related vacuum switching valve problems. Owners typically report a persistent check engine light with no major drivability issue, but the vehicle fails emissions inspection and may be difficult to refuel if the vent path is restricted. Toyota service literature and repair databases frequently reference canister-related EVAP diagnosis on these years.
Toyota FJ Cruiser(1 issue)
- A/C Compressor and Evaporator Failure2007-2014
The FJ Cruiser's A/C system is prone to compressor clutch failure and evaporator core leaks. The evaporator is located behind the dashboard, making replacement extremely labor-intensive. The A/C system struggles in hot climates, especially when off-roading at low speeds.
Toyota Highlander(1 issue)
- EVAP Purge Valve / Charcoal Canister Failure — P0441 / P0455 & Fuel-Pump Click-Off2008-2019
The evaporative-emissions system commonly sets P0441 (incorrect purge flow) and P0455/P0446 (large leak / vent malfunction). The vapor canister purge valve (VSV) sticks open or closed, or the charcoal canister breaks down internally and sheds pellets that clog the system. A classic symptom is the gas-pump nozzle repeatedly clicking off before the tank is full, plus a fuel-vapor smell. A loose/failed gas cap or cracked filler-neck boot can also set the codes.
Toyota Sienna(1 issue)
- EVAP System Leak-Detection / Vapor Canister Fault (Check Engine Light, Hard Refueling)2011-2020
Third-generation Siennas commonly throw EVAP (evaporative emissions) faults as the system ages. Failure points include the canister vent solenoid/VSV sticking, the leak-detection pump and reference orifice, the purge valve, and a worn or loose gas cap. Beyond the check engine light and an emissions/smog failure, a stuck-closed vent can make the tank hard to refuel (pump clicks off repeatedly), while a stuck-open vent or cracked line can produce a fuel-vapor smell.
Toyota Tacoma(2 issues)
- A/C Musty/Mold Smell2016-2023
The A/C system can develop a musty or moldy smell when first turned on. This is caused by moisture accumulation and mold/bacteria growth on the evaporator. Common in humid climates and vehicles that use A/C infrequently.
- Evaporative Emissions Leak Faults from Charcoal Canister, Vent Valve, or Filler Neck Corrosion2000-2015
Tacomas in this era commonly develop EVAP system leak faults that trigger a check engine light, often caused by a failing charcoal canister, stuck vent valve, cracked hoses, or a rusted filler neck in salt-belt trucks. Owners usually notice no drivability problem, but the truck will not pass emissions and the light often returns after a gas cap replacement. The pattern is well documented in NHTSA complaints, forum troubleshooting threads, and repair databases.
Looking for P0455 on a different make?
View P0455 across all makes →Frequently Asked Questions
What does P0455 mean on Toyota?▼
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 Toyota specifically, this code is documented across 5 models.
What causes P0455 on Toyota vehicles?▼
Common causes on Toyota: 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 Toyota?▼
Repair costs on Toyota range from $20 to $2,500, depending on the specific model and root cause.
Which Toyota models have P0455 documented?▼
Au7o has documented P0455 on 5 Toyota models: Corolla, FJ Cruiser, Highlander, Sienna, Tacoma.