P0455 Code how to repair?

Question

I have a 2007 Chevy Cobalt LT 2.2L and I had recently replaced the purge valve, the vapor canister valve and the gas cap and after clearing the codes the p0455 came back on after 200 miles driving do you know what it could be? But when I  checked it again it says p0455 and p0455pd

Answer 1

HI there

The code is for a large evap leak. You should have a smoke test performed to try and locate the leak. Even the seal on the fuel pump at the gas tank can cause this code. It is also sometimes the result of a bad vent control valve.