P0440 on Kia
Evaporative Emission Control System Malfunction
P0440 on Kia vehicles indicates evaporative emission control system malfunction. Au7o has documented this code across 1 Kia model — most commonly on Rio. This code indicates a general malfunction in the Evaporative Emission Control (EVAP) system, which captures fuel vapors from the gas tank and routes them to be burned by the engine instead of escaping into the air. The computer ran a self-test and detected the sealed vapor system isn't holding pressure or vacuum correctly, often signaling a leak somewhere in the system. The most frequent and easiest cause is a loose or faulty gas cap. The car will run normally, but it will fail an emissions test and may smell faintly of fuel. Typical repair costs on Kia range from $40 to $1,500, depending on the specific model and root cause.
Common Causes of P0440
- •Loose, damaged, or missing gas cap
- •Cracked or disconnected EVAP hose
- •Faulty purge valve/solenoid
- •Faulty vent valve/solenoid
- •Leaking charcoal canister
- •Damaged fuel tank filler neck or seal
- •Faulty leak detection pump or pressure sensor
P0440 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.
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What does P0440 mean on Kia?▼
P0440 stands for "Evaporative Emission Control System Malfunction." This code indicates a general malfunction in the Evaporative Emission Control (EVAP) system, which captures fuel vapors from the gas tank and routes them to be burned by the engine instead of escaping into the air. The computer ran a self-test and detected the sealed vapor system isn't holding pressure or vacuum correctly, often signaling a leak somewhere in the system. The most frequent and easiest cause is a loose or faulty gas cap. The car will run normally, but it will fail an emissions test and may smell faintly of fuel. On Kia specifically, this code is documented across 1 model.
What causes P0440 on Kia vehicles?▼
Common causes on Kia: Loose, damaged, or missing gas cap, Cracked or disconnected EVAP hose, Faulty purge valve/solenoid, Faulty vent valve/solenoid, Leaking charcoal canister. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0440 on a Kia?▼
Repair costs on Kia range from $40 to $1,500, depending on the specific model and root cause.
Which Kia models have P0440 documented?▼
Au7o has documented P0440 on 1 Kia model: Rio.