Thread: gas cap message in HUD

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  1. #1 gas cap message in HUD 
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    My 2008 grand prix just started giving me a message "Check the gas cap". This just started after I bought some octane booster which I have used many times in the past. For some reason, no matter how many times I tighten it, it still comes back. The funny thing is it never comes on until my way home from work, never on my way there. I read up on this and saw that this message doesn't always refer to a bad cap. Has anyone out there successfully resolved this?
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  2. #2 Re: gas cap message in HUD 
    GXP Level Member GTPpower's Avatar
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    It can be a cracked cap. It can also be a leak in the evap system or a bad canister.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  3. #3 Re: gas cap message in HUD 
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    bad canister


    Similar situation on my wife's '05 GT - no matter how many times I messed w/ the cap the message persisted. Ended up replacing the charcoal canister and that corrected the issue. Not all that difficult of a repair.
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