Check Engine Light Due to Gas Cap Issue on Chevrolet Impala

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 86,229 (23,000–181,000)
12 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
120 people reported this problem
53 people shared problem details
I kept getting the check engine light and tighten gas cap. Paid dealership (almost $200 including labor) for a new gas cap. Now almost a year later getting same check engine light and tighten gas cap. This time they're saying I need to replace evap vent solenoid for $130. It seems like a lot of the issues with this car are the same. GM should step up and solve them.
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Engine light comes on, reads large emissions leak, replaced gas cap.
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Check engine light is on. It says check gas cap, However gas cap is tight.
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2006 Chevrolet Impala110,000
Same issue, worn gas cap allowing air in the tank and check engine light. Bought a new cap and fixed the issue. 50,000 miles later still no re-occurrence.
3rd time in 7 months the check engine light came on and dealer keeps telling me the gas cap isn't on tight enough. i'm soooo sorry i bought this car!
Same issue, same story, paid for the most expensive gas cap they could find!
2006 Chevrolet Impala114,000
Replaced gas cap; still have problem.
engine light on; replaced of many issues with this car...
Check engine light illuminated due to gas cap issue. Replaced cap. Check engine light still on
2008 Chevrolet Impala100,000
engine light came one whenever I got gas, replaced cap and it was fine for two years, now it has started again.
2006 Chevrolet Impala131,000
had to buy a gas cap from chevy dealership because of tighten gas cap indication
reports gas cap, replaced but keeps repeating. paying 100 dollars each time for poor service. weather, raining it comes back. Three gas caps later it still comes back? Help.
loose gas cap keeps causing check engine light
Clean off the inside of the gas cap with WD40. After I got all of this dirt out, the "Tighten Gas Cap" error never came back up. Air must have been getting into the system and reducing the vacuum pressure for the gas going to the engine.
check engine light came on due to faulty gas cap.
engine light came on . we took the car to have it checked and were told the gas cap was faulty! REALLY?
have replaced the gas cap 3 x at different intervals so far.
Gas cap was replaced no help.
Gas cap would not secure due to parts being worn out, through having the check engine light read, replaced gas cap.
2008 Chevrolet Impala108,000
My check engine light came on so I had a scan done and it showed it was the gas cap sensor. My gas cap was loose before (about 6 mos ago) and now 9/19/15 when I put gas in, the cap won't even screw it. I'm going to have it replaced, likely by the Chevy dealer.
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