04 silverado question
 

my SES light is on in my truck and the display keeps telling me to tighten my fuel cap every so often. I changed the cap, no fix, so its not the cap leaking. Any ideas? I cant scan for codes, dont have the tool. I would rather not take it to the stealership and have the rape me for something stupid.

Its a 2004 silverado SS

Sounds like you've got an EVAP leak somewhere in the system. I'm willing to bet you have a P0455 DTC set. It could be a bad EVAP vent valve, a small hole in an evap line or the tank it self. Alot times I've see the rubber o-ring that seals the fuel pump assembly to the tank leak alittle. You'll have to have a shop smoke test the system.

You can run into Autozone and have them scan the truck to be sure about the code, but it sounds like Rob is on the right track with his diagnosis.

- Justin

well, thanks guys, i guess i'll have to have a shop look at it.

ya like justin said autozone or pepboys does it for free.

anybody know if there is any wiring involved in this system? there must be, somehow the computer knows about this issue. I had a problem a few months ago with a squirrel/groundhog/lion ect, chewing the wiring harness off my trans, and abs sensors under the truck. It was all fixed, but im wondering if something else was eaten and just recently broke completely and thats causing the issue? Maybe a rubber hose? i really have to get under the truck and look, i just keep forgetting because i dont drive it everyday anymore.

Sent you a PM. I can scan it for you.

its all good Thanks James!

if you ever have another problem with your truck head over to gmfullsize.com, my buddy is on that forum and they have alot of good information, he's a kuhl and the red headed kid that came with me when i bought that 350 off you, his screen name on there is ginger

Good deal. Anytime bud.