I HAVE 07 CHEV AVALANCHE WITH CODE P0449, ALREADY REPLACED GAS CAP LIGHT STILL COMES ON HELP?

Question

2007 CHEVROLET AVALANCHE WITH CODE P0449, I ALREADY REPLACED GAS CAP AND LIGHT COMES BACK ON
HELP?
IAM FEMALE AND ON STRICT BUDGET NEED HELP TO TROUBLE SHOOT AND SELF FIX

Answer 1

HI there,

The code P0449 is a code for the vent control valve. This usually means the vent control valve itself is sticking open or closed and causing the problem.

The code P0459 is for the  purge control valve. This valve opens when the engine is running so it will pull the fuel vapors out of the charcoal canister.

It is likely that the pressure sensor isn't seeing any change and it's throwing both codes because when the purge is suppose to happen there isn't a change in the pressure. This is usually because the vent control valve is open and the fuel vapors are going out of the system.