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Q: Gas Cap Dashboard Alarm on 2005 Buick Rendezvous

Recently I failed to totally seal my gas cap after a fillup. After being notified through the alarm indicator, I resealed the cap. The alarm remains. Additionally, two days later, the check engine light appeared. Are these two alarms related and what is needed to retire them?
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Yes, the alerts are related and they are usually due to the gas cap being replaced incorrectly.

USUALLY, if you remove and replace the gas cap, the light will be reset. There is usually no need to take the car to a dealer to reset the warning lights, but they (or most repair shops) can reset them. If the warning lights come back on and it is known that the gas cap was not incorrectly, threaded the next step is to diagnose the lights via a computer.

(I realize this is a very old question, but it still comes up in a search engine)
I had a similar issue with my 2005 Buick. Replaced the gas cap but the light came back on, which caused the engine light to trip. Took it to a delaer who smoke tested but could not find a leak and engine test said was a small evap leak, so they just reset the computer and light went off. That lasted a few weeks but then it happened all over again. Took it to another dealer, who did another smoke test and diagnosed a large leak and was informed a smoke test found a faulty filler tube to the gas tank, so they replaced this tube and installed a new cap, the bill was over $400. That lasted about 3-4 months and it happened again. This time they informed me that I would have to pay for the engine test again but it could now be the EVAP vent solenoid. I didn't bother, I sold the car, many models are having this problem but no factory recall has been issued. From the forums, some are reporting good results if they clean the lip of the filler tube, so hope that works for you. Otherwise, your car will not pass inspection if the engine light is tripped so could be costly, for me it involved several visits to the dealer and lots of money without any luck, so decided to try a different car mfg.
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