2006 Pontiac G6 Logo
Posted on Jul 12, 2009
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I have a 2006 grand prix and the check gas cap is on. Why?

The same time the check gas cap came on the check engine light
also came on. The gas cap indicator sometimes goes off but the
check engine never goes off. This has been going on for about 2
weeks now. Can any body tell me what could be causing the
problem?

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  • Anonymous Mar 24, 2014

    new gas cap only 1 month old check engine light stays on .this is the third gas cap in 4 years.

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2 Answers

Anonymous

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  • Posted on Jul 12, 2009
Anonymous
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Check the interior seal inside the gas cap--could be damaged or collapsed. Replace cap if damaged. Try clearing fault code by disconnecting one battery terminal for little while, then reconnect. This clears the fault memory in the computer. The other way is to have the code read and cleared with a reader.

Ronnie Wilson

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  • Master 1,596 Answers
  • Posted on Jul 12, 2009
Ronnie Wilson
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Sometimes It will set a Code and After its Corrected the Light Needs to Be Manualy Reset By DISCONNECTING the POSITIVE BATTERY TERMINAL for 30-60 SECONDS AND THIS WILL RESET THE LIGHT.

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sometimes you don't put the gas cap on properly, the sensor will put check engine light on. Go and check the gas cap.
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If the cap was tight. It could be a different leak. Drive a few days. If the light doesnt go out, a Garage will need to check it for you, there may be more to it, like an evaporative leak.
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you probably have a problem in the evap emissions system and a superficial engine diagnostic @ a shop will likely confirm this. a loose gas cap is the most common cause for this, so it tells you to check it first in an attempt to save you a trip to the shop. if the cap is new and tightened past 3 clicks, then the problem lies somewhere else in that system. there are many parts in that system, so it probably would be best left to a shop to figure out exactly what the cause is.
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1998 Pontiac Grand Prix check engine light comes on and goes off randomly. What could be the problem
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Jun 26, 2009 • 1998 Pontiac Grand Prix
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I get a po455 code on my 2004 grand prix
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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Apr 04, 2009 • 2004 Pontiac Grand Prix
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Check engine light came on along with check gas cap
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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