Evaporative emission (EVAP)
P0455 — Evaporative Emission System Leak Detected (Large Leak)
The ECU found a large leak in the EVAP system, often because the fuel cap is missing or not tightened, or a hose is disconnected.
Common causes
- Fuel cap missing, loose or damaged
- Disconnected or broken EVAP hose
- Cracked canister or filler neck
- Stuck-open purge or vent valve
- Faulty fuel tank pressure sensor
Symptoms
- Check engine light
- Fuel smell
- Failed emissions test
- Usually no driving symptoms
How to check
- Check that the fuel cap is present, correct and tight
- Inspect all EVAP hoses for disconnections or cracks
- Use a smoke machine to find the leak
- Test the purge and vent valves and the pressure sensor
Can you keep driving?
Safe to drive. It affects emissions only; repair it soon.
Related codes
Frequently asked questions
- What does P0455 mean?
- The EVAP system has a large leak.
- Is a missing fuel cap enough to cause P0455?
- Yes. A missing or loose fuel cap is a very common cause.
General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.