P0455 Chevrolet Tahoe
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 Tahoe 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 Tahoe.
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 Tahoe.
Common Causes on Chevrolet Tahoe
- Gas cap missing or severely damaged
- EVAP vent solenoid stuck open at charcoal canister
- Large EVAP vapor line disconnected or crushed by road debris
- Fuel tank seal failure at pump module
- Charcoal canister cracked from underbody impact
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 Tahoe
Tahoe, Suburban, Yukon, and Escalade have extensive EVAP line routing. Road debris can disconnect lines, especially on vehicles used for towing.