Question about 2002 Jeep Grand Cherokee

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I have a 2002 jeep grand cherokke v8 and with 11000 miles and the check engine light came on today I did get gas last night but I removed the gas cap today and put it back on ... the light is still on last year this happened and the jeep dealer said it was the cap any suggestions..

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  • 230 Answers

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!

Posted on Jun 30, 2009

  • Barry N Melissa Spring
    Barry N Melissa Spring Jun 30, 2009

    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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This may sound a little off the wall, but try it, it's cheap and easy and has been known to work occasionally on this problem.
Remove the gas cap, and carefully clean all the threads in your filler pipe well, with a rag,paper towel, or something similar. Now clean all the threads and rubber gasket/"o" ring whatever it uses for good seal on the cap. Now apply a good coat of "vaseline" to the threads, and "o" ring/ gasket. Don't get too carried away with amount, but enough to assist in making a good seal. Put gas cap back in and tighten as required, and see what happens. Sometimes a little vaseline to aid in sealing is all it needs, so you may get lucky, and it doesn't cost anything to try it.

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Remove the cap and put it back on. Either the cap isn't tight, the cap isn't sealing properly or there is a leak in the tank or venting system. (start with the easy stuff first! Often the light won't go out till you have driven about twenty miles unless the computer codes are cleared with a scanner.

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A common problem on many of the new cars is that when a person gets gas, they don't tighten up the gas cap. This will turn on the check engine light. Did you get gas recently? Another option is to see what code is stored in the ECU that turned the light on. This is done with a scanner tool. If you do not have a scanner, then have a dealer look at it.

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I had this same problem, I replaced the gas cap, disconnected the battery to "reboot" the system and it hasn't come on again.

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