was the code specifically for the gas cap, or was it an EVAP emissions code, and someone told you it could be the gas cap?

i would try cleaning the metal part that the cap goes onto, make sure it is not rusty or anything.

Did you check the sealing surface on the filler tube for the gas cap? That often gets quite rusty, and can cause the cap not to seal properly.

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*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.

I hope you have better luck with this than I've had. Mine's throwing a P0455 code that won't go away. I've cleaned the filler neck, replaced the gas cap, replaced the fuel tank pressure sending unit, cleaned the evap vent valve and the evap solenoid. And it still throws the code. I've become accustomed to resetting the "check gas cap" message as soon as I get in the car, and SES light has become part of the enviroment. The local Pontiac dealer wants to do a bunch of extensive testing (as reccommended by a TSB), and then it's required thru the TSB that a regional service rep be contacted if the issue still isn't solved. So i'm living with it...

Mark

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'05 Bonneville SLE Intense FWI & PCM, Wood Dash Kit, Chrome Valve Stem Caps!
'14 Silverado LTZ
'08 Acura TL
'05 VW Passat GLS

bring it to a mechanic and have them blow smoke in it that will tell you where your leak is,the leak can be as small as a pin hole i had the same problems come to find out it was a tiny crack on the pipe going to the tank,threw some liquid metal on it has not come back on since.

A smoke test is next in line. Good to hear that someone actually got this thing resolved.

Mark

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'05 Bonneville SLE Intense FWI & PCM, Wood Dash Kit, Chrome Valve Stem Caps!
'14 Silverado LTZ
'08 Acura TL
'05 VW Passat GLS

same here, i think its my gas cap though, but i havent replaced my gas cap yet. WHY? well because i want the original gas cap that hangs on the gas door and those cost $25, im trying to find one on ebay. But, if you already changed the gas cap and cleaned everything, it should be a leak somewhere.

Good luck.

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- Zin

*SOLD* 2000 SSEi | Midnight Blue Metallic | 120k
Supercharged decal 3rd brake light | Mostly stock| black leather interior | One of a Kind Tails | Custom SSEi Overlay | Painted Grille | Tints 20%(back) 35%(front)
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** NEW PIC's **----->: http://pontiacbonnevilleclub.com/forum/viewtopic.php?f=9&t=12985

Smoke test..... I have never heard of that before. Sounds like a good idea though. It would be much easier to track down a cracked / split line that way

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Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

How do they do this smoke test??? Sounds interesting. Mine is throwing that code and not sure why. Thanks!

i belive it is the same way they smoke the engine to find leak's in the gaskets.

they seal off the gas filler, and pump an artificial smoke in, like the kind used at rock concerts, and if you can see smoke, there is a leak somewhere.

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Bye Bye:

RIP sandrock