The evaporative emissions system uses a vaccuum pump to check the fuel system to make sure that fuel vapors cannot escape into the atmosphere. If you leave fuel cap loose the computer will detect it and set a computer code and turn on the check engine light. If the cap is tight and the light still comes on, you may have other problems. Hopefully your vehicle is still under warranty, as evaporative emission system leaks can be very difficult to locate and repair, even for the dealership mechanics.
It very well could be a tiny hole in the fuel neck or fill tube. With the newer sealed system any small air leak can cause this light to trip not to leave out the gas cap seal.
SOURCE: Check engine light/gas cap will not stay tight.
yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.
SOURCE: 2006 Saturn Vue Check Engine Light
Disconnect the battery wait 10 minutes, then reconnect it.
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