Question about 2004 Pontiac Grand Am

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Service engine light

My daughter did not put gas cap on right, 2004 grand am. How do I reset the service light?

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  • wally5340 Dec 25, 2008

    Thank you. I will try it tomorrow.

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  • 409 Answers

You will have to have it reset with a scan tool. Disconnecting the battery won't do it anymore. Go over to a parts store that has a scan tool and ask them to scan it for you and tell them to clear the code. It probably set a fuel evaporative leak large code. 

Posted on Dec 25, 2008

  • John Weathers
    John Weathers Dec 25, 2008

    If you are in the Austin TX area I would be more than happy to scan and reset it for you for free. If my reply helped please give it a rating.

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1 Answer

Where is the ecm fuse located on 2004 grand am gt


If the light is still on with the engine running, the problem has not been resolved. The computer is still seeing the problem. Had the gas cap fixed it, it would have turned off the light and kept the trouble code stored in memory.
You can turn the light off and erase the stored codes, but it will likely return. The approved method is to use a hand held scanner, a free service at autozone and a few other national parts stores. Before you have them erase the codes, write the number down and post it here. Maybe someone can help you find the problem. Those diagnostic trouble codes are all over the internet-you can google it, or you could find a site that is devoted to them. Here is one, a good one that gives the description. If you click on a particular code, you can go to a page with some discussion about possible causes and solutions:

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Open the trunk, pull the carpet back to reveal the access to the fuel pump. The gas tank pressure sensor is located on top or the fuel pump. The connector has 3 wires, 1 black and 2 colored. Pull the plug off the sensor, put jumper across the 2 colored wires, tape it up with electrical tape. Replace the access cover, the carpet, close the trunk and never see that "CHECK GAS CAP" message again.

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simple really--- i have 2 jeeps and my daughter has one also--2 libertys and 1 cherokee--this has happened a couple times--what i did was remove the gas cap--carefully remove the rubber sealing ring and clean the rubber ring and the cap seat where the ring sits.( a clean rag will do this ) before putting the gas cap back on--i disconnected the battery cables--neg 1st and then positive--waited ten mins or so and put gas cap on 3 clicks --then reconnected battery cables in the reverse order-pos 1st and then negative-tighten connectors--then turn key on till bell stops then off--(do this 3 times) then start jeep--should be good ta go--reset your radio settings--as what you've just done is reset your computer--worked perfectly for me everytime--also has worked on a few friends cars that I've reset except for one and she needed the Evap sys module which went bad---happy motoring !

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Remove your negative cable for 5 min. from your battery to reset the comp. code. Put it back on. Drive it. If the light comes on, go to your local auto parts store, Autozone or someone big like that. They'll do a free scan on the comp. for the code and get you moving in the right direction for fix!

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I had a check engine light on for my gas cap. I fueled up and sometimes it would say "check gas cap" So i just plugged it in under the steering wheel and cleared the check engine light from my dash board. So far so good.

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I have the same car and if the gas cap is loos for any reason the service engine light will come on so check that. If it is it will turn off in a few days after you tighten it.

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Did u have engine codes scanned? If not, have it done, as it may indicate the problem. Let me know. (most parts stores will scan for codes free) .

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hi, this is just a reset issue. sometimes the CPU can become confused. the original warning that informed you about your gas cap is still in the cpu's memory. you will have to reset the cpu and, this will clear the warning. After the reset, it will stay off. chevy cpu's tend to do this from time to time.

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