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Start by getting the DTCs diagnostic trouble codes as they will point you in the right direction. You may have some blockage in the vent tube or the vent solenoid fail but really what good is guessing when you can simply get the trouble codes and have a starting point.
I would first suspect that the gas cap is losing its seal, which happens to take about 1/4 tank of driving perhaps. The fuel tank, like most cars today, works on a closed system with a return and the air above the fuel needs to remain slightly pressurized.
The gas cap was a common problem on the 04 Aveo's; in fact the dealers were fixing them for free then. Tightenning the cap wont imediately turn of the light however because the computer needs to see the engine go through several drive cycle conditions before clearing.
Inpect the cap, the seal and the fuel neck. Perhaps cleaning the cap and seal area if necessary. Look for cracks in the fuel neck. If all looks good and this doesnt work try a new cap either aftermarket or from the dealer.
The gas cap was NOT b/s. A loose cap upsets the evap monitoring within the engine check system. If you have an engine light on there are two options on a OBDII compliant car.
1 The engine light will stay on showing there is a fault that requires attention.
2 The engine light will stay on until the ECU has completed a series of checks over a predetermined period of driving cycles, if the fault is no longer active the engine light will be off when you next start the car after the last successful check.
Hope this helps - good luck.
Make sure your gas cap is tight, at least 5 clicks, sometimes a gas cap that doesn't seal tight will trigger the Check Engine Light. If the light stays on you will need to pull the Trouble Code from the ECM (Computer) using a OBD II scanner.
check to see that the fuel cap is on correctly ... there is a sensor that checks to see if gas vapors are leaking into the atmosphre and causing ozone depletion and alerts you to this. if it is on correctly and tight the light will go out after you drive several miles if you want a quick check on this light ... disconect the neg battery cable for 10 min and reconnect if the light is out and stays out the problem is solved if it comes back on then look to something else as the cause. As long as the light is not flashing you are ok.
The most common cause of this is the gas cap not being tightened completely after re-fueling or a worn rubber gasket on the cap.Remove the gas cap and turn it over and check the gasket if it looks like it's not worn put the gas cap back on and then tighten it until it clicks several times, then it make take a little while before the check engine light goes off. If this still happens shortly after tightening the gas cap have the check engine code read at an Automotive Parts store. Some stores have the code readers and they'll get what the code means and advise you at that point.
make sure that the gas cap have a rubber gasket in it if it has accidentaly dropped off while you removed to fill the tnk it will not seal properly and create a vacum leak causing the ecm to turn on the light.
or did you have an accident or did you run over any thing that could have damaged the vapor canister at the bottom of the vehicle and if this is the case you will see the light on because a damaged canister can cause a vacum leak