P0455 on Kia
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Kia vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 2 Kia models — most commonly on Rio, Sorento. 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 Kia range from $30 to $1,500, 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 Kia by Model
Kia Rio(2 issues)
- A/C Compressor Premature Failure2012-2018
The Rio air conditioning compressor fails prematurely, typically between 60,000-100,000 miles. The compressor clutch bearing fails first, causing a squealing noise, followed by complete compressor seizure. When the compressor fails, it can send metal debris throughout the A/C system, contaminating the condenser, expansion valve, and evaporator, making the repair more extensive.
- Evaporative Emissions Leak from Deteriorated Purge/Canister Hoses and Loose Fuel Filler Neck Components2001-2011
A recurring complaint on aging Rio models is persistent EVAP leak codes caused by cracked vapor hoses, purge valve issues, canister vent faults, or corrosion around the filler neck area. Owners often notice a check engine light with no drivability problem, but repeated inspection failures and fuel odor can result. This is especially common on older, high-mileage cars exposed to heat and road salt.
Kia Sorento(1 issue)
- P0455 — Gross EVAP Leak from Gas Cap, Purge Solenoid, or Canister Close Valve2011-2020
P0455 is a large/gross EVAP leak on the Sorento — a much bigger opening than P0442. On the 2012-2015 XM Sorento the most common cause is again a loose or faulty gas cap, but when the cap checks out the two prime suspects are the Purge Control Solenoid Valve (PCSV) in the engine bay and the Canister Close Valve (CCV) mounted under the vehicle near the charcoal canister. A classic Sorento tell for a bad PCSV is hard starting immediately after refueling (raw vapor flooding the intake). Kia has issued TSBs for the XM Sorento touching the purge solenoid on the 2.4L and the fuel Fill-Level Limit Valve.
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View P0455 across all makes →Frequently Asked Questions
What does P0455 mean on Kia?▼
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 Kia specifically, this code is documented across 2 models.
What causes P0455 on Kia vehicles?▼
Common causes on Kia: 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 Kia?▼
Repair costs on Kia range from $30 to $1,500, depending on the specific model and root cause.
Which Kia models have P0455 documented?▼
Au7o has documented P0455 on 2 Kia models: Rio, Sorento.