P0455 Volkswagen Tiguan
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 Volkswagen Tiguan 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 Volkswagen Tiguan.
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 Volkswagen Tiguan.
Common Causes on Volkswagen Tiguan
- Gas cap missing or seal completely failed
- N80 EVAP purge valve stuck wide open
- Large EVAP vapor line disconnection or severe crack
- Fuel tank leak detection pump failure
- Charcoal canister housing split open
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 Volkswagen Tiguan
VW N80 purge valve stuck open is the most common P0455 cause on Jetta, Tiguan, Taos, and Atlas after the gas cap.