Fawn Orelee

2024 Sierra Denali Evap Leak. A condition may exist where a leak in the evap system only exists under a vacuum condition. A loose fuel tank filler cap is the most common cause that will trigger the p0455 code.

Same leak happening on my 2024 2500 lt @6k miles. A loose fuel tank filler cap is the most common cause that will trigger the p0455 code.