P0440 on Chevrolet
Evaporative Emission Control System Malfunction
P0440 on Chevrolet vehicles indicates evaporative emission control system malfunction. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. 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 Chevrolet range from $120 to $450, 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 Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- EVAP Vent Solenoid Clogging With Dust/Water Causing Check Engine Light and Hard Refueling2000-2007
A very common GMT800 Silverado problem is contamination of the EVAP canister vent valve/solenoid by dust, road debris, or water intrusion. When the vent cannot flow properly, the truck sets EVAP leak or vent performance codes and may repeatedly shut off the gas pump during refueling. GM issued service bulletins and updated vent relocation kits for trucks used in dusty environments.
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View P0440 across all makes →Frequently Asked Questions
What does P0440 mean on Chevrolet?▼
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 Chevrolet specifically, this code is documented across 1 model.
What causes P0440 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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 Chevrolet?▼
Repair costs on Chevrolet range from $120 to $450, depending on the specific model and root cause.
Which Chevrolet models have P0440 documented?▼
Au7o has documented P0440 on 1 Chevrolet model: Silverado 1500.