So I have a 2006 SS 52K miles and have the same code. Tightened the cap to no avail. Replaced the fuel cap, hoped for cel to go off. Nothin. Now noticing sudden drop in mpg. Took it in to dealer to check and they got same code (p0455) and tested pressure, said all was fine, take it home. I cannot spend this kind of money of gas! What to do next? Let me know what you find out, I find it ironic that we are driving almost the same car and have the same problem at the same time! Hmmmmmmm. I've been surfing everywhere for answers, nothing yet. I'm wondering if a smoke test is necessary since the pressure is fine, maybe a very small leak needs to be found. I don't know a thing about cars though, so who knows. Good Luck!
Friday, December 11th, 2020 AT 4:07 PM