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P0455 P0xxx · 动力总成（P） 低严重度
Evaporative Emission Control System Leak Detected (Gross Leak)
A large leak — the system cannot hold any pressure at all. Usually an obvious physical fault: missing cap, split hose, or a disconnected line.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- Strong fuel smell
- Check-engine light
- Visible fuel vapour in extreme cases
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Missing or badly seated fuel cap
- 2 Disconnected vapour hose
- 3 Split filler neck hose
- 4 Damaged canister
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Look for the cap first — the majority of gross leaks are nothing more than that.
- ✓ Follow every vapour hose from tank to canister to purge valve.
- ✓ Smoke-test to confirm the repair.
- ✓ Re-run the EVAP monitor with a scan tool before returning the car.
维修方案
- Fit the correct fuel cap
- Reconnect or replace the hose
- Replace the damaged canister
P0455 —— 常见问题
Is it an emergency? +
No, but a gross leak is a genuine fire risk. Do not park over a heat source and fix it promptly.
Will the light clear on its own? +
Only after the monitor runs and passes, which needs a drive cycle with a partly filled tank.