P0446 on Kia
Evaporative Emission Control System Vent Control Circuit
P0446 on Kia vehicles indicates evaporative emission control system vent control circuit. Au7o has documented this code across 1 Kia model — most commonly on Rio. This emissions code points to a problem in the evaporative emission (EVAP) system's vent control circuit, which manages the vent valve that lets the charcoal canister breathe and seals it during leak tests. The EVAP system captures fuel vapors from the tank to keep them out of the atmosphere, and the vent valve must open and close on command for the system to work and self-test. The code sets when the engine computer detects an electrical or performance fault with this vent valve or its circuit. It usually causes only a check engine light with no driveability change, but it does prevent proper EVAP leak monitoring. Typical repair costs on Kia range from $40 to $1,500, depending on the specific model and root cause.
Common Causes of P0446
- •Faulty EVAP vent control valve (solenoid)
- •Wiring or connector fault in the vent valve circuit
- •Vent valve clogged with dirt, debris, or spider webs
- •Damaged or corroded vent valve connector
- •Blocked or pinched vent hose or filter
- •Faulty charcoal canister assembly
- •Faulty engine control module driver circuit
P0446 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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View P0446 across all makes →Frequently Asked Questions
What does P0446 mean on Kia?▼
P0446 stands for "Evaporative Emission Control System Vent Control Circuit." This emissions code points to a problem in the evaporative emission (EVAP) system's vent control circuit, which manages the vent valve that lets the charcoal canister breathe and seals it during leak tests. The EVAP system captures fuel vapors from the tank to keep them out of the atmosphere, and the vent valve must open and close on command for the system to work and self-test. The code sets when the engine computer detects an electrical or performance fault with this vent valve or its circuit. It usually causes only a check engine light with no driveability change, but it does prevent proper EVAP leak monitoring. On Kia specifically, this code is documented across 1 model.
What causes P0446 on Kia vehicles?▼
Common causes on Kia: Faulty EVAP vent control valve (solenoid), Wiring or connector fault in the vent valve circuit, Vent valve clogged with dirt, debris, or spider webs, Damaged or corroded vent valve connector, Blocked or pinched vent hose or filter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0446 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 P0446 documented?▼
Au7o has documented P0446 on 1 Kia model: Rio.