There are 2 threads on this issue --- check fuel cap message and fuel cap warning. Here is what I posted yesterday on the other thread. FYI ---
Took the RL to the dealer again last Friday. As previously reported, over the last 45 days, I have had the "check fuel Cap " msg come on, took to dealer, msg came back on, then the "check engine" icon came on. The dealer did take the problem serious this time. The work order states "small leak in evap system between PCS and fuel tank...called techline....ran tests and finally used smoke machine to find crack in canister at line nipple. replaced and ran function test it passed"
All the msg lights are off. So it looks like it is fixed. Time will tell.
So I have been contacted by 4 people that have the "check fuel cap" msg. Here is what I would do. The 1st item is to determine if it really is the cap. Once you notice the "check fuel cap" msg, fill the tank, make sure the cap is secure, reset the msg by pressing "reset" on the dash and wait 3+ days or 50 miles. If the light stays on, take to the dealer and get them to take you seriously that you know how to put the cap on.
Rdhplano