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The check engine light usually comes on due to emissions issues. I'd bet that tank of gas was the culprit. Run it nearly empty and then fill up again. If it doesn't go out in a few days take it to an auto parts store and have them read the code. At that point my guess would be O2 sensors.
99% of the time, the gas cap wasn't tightened properly, or is leaking. Make sure you twist it tight and it clicks a few times. If the "Check Engine" light stays on after a few days, buy a new gas cap. Again it may take a few days to clear.
Hi Patricia: If the "Check Engine" light came on soon after a fill-up at a gas
station, check if your gas cap is closed properly. If the gas cap wasn't
on tight, this could be the problem. Secure the gas cap properly and if
there is no other problems, the "Check Engine" light should clear
itself out in a few days of driving. If the gas cap was tight, there is
some other problem. Have your car computer scanned to see what is wrong.
It could be some minor problem, but it also could be something more
serious that can cause more damage to your vehicle if not repaired in
time. Some garages or parts stores often offer to scan your computer
for free. Others will charge you a diagnostic fee. If your car is fairly
new, I'd advise to visit your dealer for this, because it's possible
that the problem is still covered by the original warranty and can be
repaired for free or a minimum charge. Check your owner's manual for
Hope this helps; also keep in mind that your feedback is important and
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testimonial comment about this answer.
Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.
Did you replace the gas cap? Also check the filler tube that's where the gas cap snaps on where you put gas in. The filler tube or neck has a thin lining of plastic at the top look for small cracks in it where the gas cap goes on. It there's cracks in it, it will cause an emission leak and sometimes a dealer won't find it until you spent a lot of money on diagnostics. And it depends if there best mechanic was working on it.
there is a large evaporative leak. keep away form ottozoo, they dont have the brain power to actually diagnose a light bulb., their job is to sell parts., if they sell you the wrong parts tough.Take it to a qualified repair shop that does a lot of GM work or the dealer.
Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:
1. Defective or loose fuel cap 2. EVAP canister or hose cracked- not connected 3. Purge or vent solenoid defective 4. Vacuum leak at engine
Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.
Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!
Yes, the gas cap will cause the Check Engine Light to come on. Will set code P0441 if I remember correctly. It should be okay to drive it. If you would like to confirm the code, take the truck to an auto parts store like Autozone and have them hook up their scan tool and read the code. If its P0441 it will probably be something like EVAP or Evaporative system leak.
Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.