Toyota Check Engine Code
P0455 on Toyota
Evaporative Emission Control System Leak Detected (Large Leak)
Also covers: Lexus, Scion
P0455 on Toyota: what makes it different
P0455 is a large EVAP system leak. On Toyotas this is overwhelmingly caused by the fuel cap or the charcoal canister assembly under the vehicle. Many late-model Toyotas (Camry, Corolla, RAV4, Tacoma) use a sealed EVAP system where any significant leak immediately throws P0455.
Most-affected engines
- 2AZ-FE 2.4L (Camry, RAV4)
- 2AR-FE 2.5L (Camry, RAV4, Highlander)
- 2GR-FE 3.5L V6 (Camry, Highlander, Sienna)
- 2TR-FE 2.7L (Tacoma, 4Runner)
Common model years: 2005–2018
Most likely cause on Toyota
Loose, cross-threaded, or worn fuel cap not sealing properly.
Known Toyota engine-family issues
Toyota fuel caps are a known wear item — the rubber seal hardens after 8–10 years and starts leaking even when fully tightened. Trucks like the Tacoma and 4Runner also see rodent damage to the EVAP hoses running along the frame, which mimics a P0455. The charcoal canister on Tacoma/Tundra is mounted near the fuel tank and is exposed to road debris.
Toyota-specific causes (most common first)
- Loose or worn fuel filler cap (most common)
- Cracked or disconnected EVAP hose near the canister under the vehicle
- Failed charcoal canister assembly (especially after rodent damage)
- Failed vent valve / Canister Closed Valve (CCV)
- Failed purge valve stuck open
- Damaged fuel filler neck or seal
Toyota-specific diagnostic tip
Start with the cheapest test: replace the fuel cap with a genuine Toyota cap (not a generic auto-parts one — aftermarket caps are a common cause of repeat P0455 on Toyotas). Drive 2–3 full drive cycles and see if it returns. If it does, smoke-test the EVAP system; on Tacoma/4Runner specifically, crawl under and inspect the EVAP lines around the canister for rodent bite marks before condemning any valves.
Symptoms drivers report
- Check engine light
- Fuel smell around the car (occasional)
Typical repair cost on Toyota
Most Toyota owners fix P0455 for between $15 and $600, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — Loose, cross-threaded, or worn fuel cap not sealing properly. — before throwing parts at it.
Toyota P0455 FAQ
Why does P0455 keep coming back on my Toyota after I replaced the gas cap?
Either the replacement cap isn't sealing (aftermarket caps are a frequent culprit on Toyota — use OEM) or the leak is elsewhere, commonly the vent valve or a cracked hose near the charcoal canister. A smoke test will pinpoint it in minutes.
Is it safe to drive my Toyota with P0455?
Yes, it's an emissions code and won't damage the engine. You may notice a fuel smell after filling up. It will, however, fail an emissions/inspection test.
Will P0455 cause my Toyota to fail to start or run rough?
No. EVAP leaks don't affect engine running. If you have rough running plus P0455, you have a second unrelated issue.
Related codes
Drive a different make? See the general P0455 guide for cross-vehicle causes and symptoms.
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Most common fix for P0455:
Replacement gas capAs an Amazon Associate, AXLY earns from qualifying purchases. General P0455 guide →