P0455 Chevrolet Traverse
EVAP System Leak Detected (Gross Leak) · Powertrain Code · Medium · Repair: Easy
What is P0455?
A large leak has been detected in the EVAP system. Check gas cap first — if secure, look for disconnected or cracked EVAP hoses, a stuck-open purge valve, or a leaking charcoal canister.
When the Chevrolet Traverse triggers code P0455 (evap system leak detected (gross leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Chevrolet Traverse.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Chevrolet Traverse.
Common Causes on Chevrolet Traverse
- Gas cap not installed or severely worn
- EVAP vent solenoid stuck open at canister
- Large crack in EVAP vapor line along frame rail
- Fuel tank vapor hose completely disconnected
- Charcoal canister housing cracked
Symptoms
- Check engine light illuminated
- Noticeable fuel smell near vehicle
- Gas cap warning light on dashboard
- Failed emissions test
- Fuel economy noticeably decreased
Notes for Chevrolet Traverse
Traverse and Acadia have longer EVAP line runs that are susceptible to damage. Inspect full routing during diagnosis.