Toyota Check Engine Code
P0440 on Toyota
Evaporative Emission Control System Malfunction
Also covers: Lexus, Scion
P0440 on Toyota: what makes it different
Toyota's EVAP system on models like the Camry, Corolla, and RAV4 uses a sealed fuel vapor system with a purge valve and charcoal canister. A general EVAP malfunction code is extremely common and usually traced to simple sealing issues rather than major component failure.
Most-affected engines
- 1AZ-FE/2AZ-FE 2.4L (Camry, RAV4)
- 1ZZ-FE 1.8L (Corolla)
- 2GR-FE 3.5L V6 (Camry, Avalon)
Common model years: 1999–2015
Most likely cause on Toyota
Loose, cracked, or missing gas cap seal
Known Toyota engine-family issues
Toyota EVAP lines routed near the fuel tank are prone to hose cracking with age, and the gas cap seal on many 2000s-era Camrys and Corollas is a frequent, low-cost fix for this code.
Toyota-specific causes (most common first)
- Loose or damaged fuel filler cap (very common on older Camry/Corolla)
- Cracked or deteriorated EVAP hoses near the fuel tank
- Charcoal canister vent valve stuck or clogged
- Purge valve (VSV) stuck open or closed
- Cracked fuel tank filler neck from age
- Damaged EVAP line fittings near the rear axle (corrosion in rust-belt states)
Toyota-specific diagnostic tip
Start with the gas cap — tighten it fully (listen for the multiple clicks) and clear the code; if it returns, a smoke test of the EVAP system is the most reliable way to pinpoint a leak on Toyota's sealed EVAP design without guessing at parts.
Symptoms drivers report
- Check engine light
- Slight fuel smell (rare)
- No drivability issue
Typical repair cost on Toyota
Most Toyota owners fix P0440 for between $15 and $350, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — Loose, cracked, or missing gas cap seal — before throwing parts at it.
Toyota P0440 FAQ
Will a loose gas cap really trigger P0440 on a Toyota?
Yes, this is one of the most common causes on Toyota vehicles — the EVAP system is very sensitive to even small vacuum leaks from an improperly sealed cap.
How is P0440 different from P0442 or P0455 on a Toyota?
P0440 is a general EVAP malfunction, while P0442 indicates a small leak and P0455 a large leak. P0440 can appear when the system can't fully run its leak-check diagnostic.
Is it expensive to fix P0440 on a Toyota?
Usually not — most cases are resolved with a new gas cap or a cracked hose repair, both low-cost fixes.
Related codes
Drive a different make? See the general P0440 guide for cross-vehicle causes and symptoms.
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Most common fix for P0440:
Replacement gas capAs an Amazon Associate, AXLY earns from qualifying purchases. General P0440 guide →
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