Why does code P0455 keep coming up?

Question

I have a 2006 Chevy Trailblazer that pulls code P0455. I have changed the cannister purge valve and the vent valve as well as the gas cap. I also changed the air control check valve. I reset the code and drove approximately 100 miles. Then the gas cap light came on and the P0455 code is now pending. HELP PLEASE!! I am at my wits end. Any info would be greatly appreciated.

Answer 1

P0455 this code is large EVAP leak detected, being a GM this code is most set due to the FTP (fuel tank pressure ) sensor code, just pop the old sensor and pop in a new sensor , this is always the fix

Comments

Thank you! I'll give it a try. I've had a smoke test done and no leaks were found.  So,  this makes sense. I'll let you know if this works.