Thread: Dic keeps saying to check gas cap even after replacing the gas cap

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  1. #1 Dic keeps saying to check gas cap even after replacing the gas cap 
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    So, as the title says, my dic said to check gas cap, so I did what anyone would do and replaced the gas cap with a new one. Well it still keeps telling me to check the gas cap. It's getting annoying having to hit the enter/reset button every time I start the car. Anyone run into this issue and know a solution?
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  2. #2 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
    GTX Level Member industrialfish's Avatar
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    What year is it? Believe it or not the 04 gas cap is a different part number than the 05, so if you get an "04+" gas cap it may fit but really only on the 04, etc.

    Next time you head to the parts store have them compare parts numbers for the different years and get the one specific for your year.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
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  3. #3 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    It's an 04. OK, I'll have to look into that.
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  4. #4 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
    Killa Bee Scottydoggs's Avatar
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    large evap leak if the cap fails and its the right cap.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Had a gas cap code on my 04 , replaced it with this one and it has not come back.

    http://www.amazon.com/ACDelco-GT279-...ype=automotive
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  6. #6 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Ok, so I replaced the cap with the one rottonj recommended and it still keeps saying check gas cap. Once a a great while it doesn't tell me to check gas cap though. Where should I start looking for an evap leak?
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  7. #7 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Do a YouTube search for home-aid smoke test, or bring it to someone with a tester.
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  8. #8 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    I think this is usually a bad evap canister, it was on mine. You might need the sub-harness that comes with it as I believe they switched the electrical connector on later models. I got the damn canister for cheap on rockauto and it cost me as much for the harness at autozone when I realized I needed the harness. Try checking that maybe. Too easy to do, rear tire off, splash shield off, its right there.
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  9. #9 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Was it the canister or the canister purge valve/solenoid? I have no experience with emissions equipment except eliminating it on older cars.
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  10. #10 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Its the vapor vent valve/solenoid. This guy

    http://www.amazon.com/ACDelco-214-23.../dp/B00559WHSE

    Also note you will need the new harness as well.

    http://www.amazon.com/gp/product/B00...7EBKDS8BGHDB92

    I believe there was a design change after '04, much like with the fuel filters going from external to internal or integrated into the fuel pump. I would air on the side of caution and buy the harness as well. It might say it doesn't fit an '04 but ignore that. The vent valve/solenoid is a newer design hence the requirement for the harness. I was unlucky enough to take of the left rear tire and splash shield, take the valve/solenoid off only to realize the plugs didn't match.

    Its an easy install, buy both and even if I'm wrong about the harness worst is that you return it. I think its horse sh*t that the harness costs just as much as the valve/solenoid, but whatever. This should fix your problem.
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  11. #11 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
    GXP Level Member Turbocharged400sbc's Avatar
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    All I had to do was stick my dic in my gas cap and it fixed this problem on my 04.
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  12. #12 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
    GT Level Member mguzzo's Avatar
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    or you have a pinhole leak in the filler tube between the cap and the tank
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  13. #13 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Quote Originally Posted by mguzzo View Post
    or you have a pinhole leak in the filler tube between the cap and the tank
    I know it's not this. I fill the tank until the cup where the cap goes is full. Well I did until 2 weeks ago anyway. Now I found out that's a bad thing.
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  14. #14 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Thanks robinsone. Parts ordered.
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  15. #15 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Update: finally got a chance to install the canister and wire harness. No more engine light and dic message. Thanks everyone.
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  16. #16 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    Maybe this is a little late, however I had this same "Check Gas Cap" issue, I replaced the cap and the light stayed on, I believe that was the same code, I chased a few different EVAP sensors, and then I found it, being the 'EVAP Vent Solenoid/Purge Vent Solenoid' (something along those lines) underneath the rear bumper, on the left hand side. Look under the car and straight up near the gas filler neck and you'll an odd, soda can sized plastic canister, I replaced it and cleared the code. Never came back this was on 10/02/2016 @ 192,141miles.
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  17. #17 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    I have a problem when filling up with gas every time I do it the pump acts like im full of gas and I have to hold the handel just barley so it fills up really slow could the canister have something todo with this or what is my problem
    2005 Pontiac grand prix gtp phx az first wbody car first time doing any mechanical work just plan new to this whole thing
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  18. #18 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
    Killa Bee Scottydoggs's Avatar
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    your evap charcoal canister is likely bad, replace it, its in the d/s rear quarter panel. under the filler neck.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  19. #19 Re: Dic keeps saying to check gas cap even after replacing the gas cap 
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    So I had a evap code from the 08 cobalt I had and it uses the same gas cap as my 07 (no actual thread more of a bayonet lock). The seal on the cap is important as the car will pull a vacuum when running. The gas caps seal was not broken but it was heavily worn and lost all of its spongyness. I bought a replacement gas cap and the problem disappeared. I imagine the one on my GP will have the same fate but it is a cheap and easy fix.
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