P0455
PowertrainEvap Systemlow severityEVAP System Leak Detected (Gross Leak)
What P0455 Means
A large leak has been detected in the EVAP system.
Symptoms
- Check Engine Light
- Fuel smell
- Failed emissions
Common Causes
- Gas cap missing or very loose
- Disconnected EVAP hose
- Cracked charcoal canister
- Large hose crack
- Fuel filler neck crack
Diagnostic Steps
- Check gas cap - may be missing or damaged
- Visually inspect all EVAP hoses
- Smoke test EVAP system
- Check charcoal canister
- Inspect fuel filler neck
Where to start: Large leaks are usually easy to find. Check gas cap first.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Related Codes
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0455?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix