Ok so i have had the "check gas cap" message show up for almost 4 months now i have replaced vacuam lines on the motor also the purge seilond and the u-bend line to that runs off the left side of the purge seilond i have replaced the gas cap i have an 02 ssei when i replaced the u-bend the message went away for about 2 days then came back on and threw the evap code (before was the cat converter code) i have no clue where to go next i check the hoses on the fuel pump they were all in good shape sorry for the story i wrote but want to give yall the run down on what i have done so i can fix this as fast as possible

if you can give up the dtc # that would be big help.

dtc P0440 sorry forgot to post that

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I also had a Check Gas Cap Message on the information center. My 2003 SSEI has 165,000 and the 3/8 vacuum hose was cracking on the nipple coming out of the front driver side, if I squashed it or bent it you could see the cracks. It was also cracking where it stepped down in size. I believe you are calling it the u-bend. I ended up replacing the hole u-bend by glueing 2 different size vacuum hoses together. I've ended up replacing most of the rubber vacuum lines on the engine because they are dry rotting from the heat.

So i got in my car today the ses light and check gas cap message both turned off just goes to show my car is like a woman love one day and **** me off the next so its fix for now thanks for yalls help

Well lets hope it stays off for good.

First post.. welcome me! Anywhoo. I had the same problem. Replace cas cap and as much other stuff as I could. Had to go to the stealership and they smoked the system. It was the evap canister... $1,200 cause it took them two trips to figure it out.