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I purchased a 2003 GMC Envoy fourteen years ago, spending hundreds of thousands of dollars trying to solve the infamous P0440 EVAP code. If one Google searches 2003 GMC Envoy P0440, you won't feel alone because millions of reports and complaints about how to fix P0440. "The Engine code P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code (NHTSA)."
It sounds pretty simple fix yet I still have problems passing my smog check. I've spent years trying to solve this issue but nothing seems to work. I'm baffled after replacing my gas tank, gas tank hose, smoke test and the list goes on and on and on and on. One day I hope to fix this issue.
Update from May 6, 2017: Still waiting for a resolution, yet nothin.
- Krystal H.,
Seal Beach, CA, US