P0455 Chevrolet Trax
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 Trax 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 Trax.
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 Trax.
Common Causes on Chevrolet Trax
- Gas cap missing, damaged, or cross-threaded
- EVAP purge solenoid stuck open
- EVAP vent valve stuck open at canister
- EVAP hose completely disconnected from fitting
- Fuel filler neck crack allowing large vapor leak
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 Trax
Trax and Encore GX P0455 codes are almost always a gas cap issue. If not, check for disconnected EVAP hoses.