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: 89,978 (23,000–200,000)
12 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
122 people reported this problem
46 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.
Check engine light is on. It says check gas cap, However gas cap is tight.
Engine light comes on, reads large emissions leak, replaced gas cap.
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.
Check engine light illuminated due to gas cap issue. Replaced cap. Check engine light still on
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!
2006 Chevrolet Impala114,000
Replaced gas cap; still have problem.
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.
loose gas cap keeps causing check engine light
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
Same issue, same story, paid for the most expensive gas cap they could find!
engine light on; replaced of many issues with this car...
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.
check engine light comes on and it says to tighten gas cap... im guessing i need a new one
2007 Chevrolet Impala180,000
P0449 code!! I've owned this vehicle since it came off the line. Very few problems,but I don't drive it like its a race car. if you're having an issue with your check engine light due to p0449 code then it can be a few things. 1 a bad gas cap which happens all of the time it is a common issue. 2 a small solenoid in the front of the engine next to the throttle body can get clogged up or just go bad. 3 a small canister behind the driver rear wheel can go bad and also cause these problems. Vent solenoid, purge valve, vent valve, look these up for the impala.
Gas cap would not secure due to parts being worn out, through having the check engine light read, replaced gas cap.
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