I have a 2003 Chevy Suburban that has a P0455 code that I have cleared 2 times at an Auto Parts Store. I replaced the fuel cap, did not help. Any help with troubleshooting ideas, any pictures of Evaporative Canister location, Vent Solenoid, Purge Solenoid would be appreciated.

 

Welcome to the forum.

Look in the area in front of the rear axle and on the floor pan. Not sure but that's where it is on the NBS.

 

Need the procedures to replace the Vent Solenoid or check valve that is common to stick open on the Evaporative Canister.

 

I discovered 3 - error codes P0442, P0443 & P0455 after taking my 03' Suburban 1500 5.3L 2wd to get smoged. Went to my mechanic who did a smoke test found leaks on both (cracked vent/rollover valves) from the top of the fuel tank. Fuel tank replaced, $1,100 dollars later code P0455 came back after a week or two . Back to mechanic discovered bad contact where the wires connect to the molex connector to the canister purge control solenoid while moving wires around because it would work then not work. He ordered the connector, I replaced it myself. Took it back so he could clear the code. Code back (P0455) after a week or two. I replaced the gas cap with an OEM. Took it to my friend who read and cleared the code. Code was back after a couple weeks. Where do I look next? Please help I'm going crazy. I really need a DIY fix cause I'm running out of cash....