Question about 1999 GMC Jimmy

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Service engine light came on what do i do. The light wasnt on yesterday but this morning when i started it up it was on. I took off the gas cap and put it back on and tighten it 5 clicks

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Have the error codes checked for your vehicle to determine why the light has come on. Autozone will do it free of charge.

Posted on Oct 19, 2010

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Van starts hard, then runs fine, fan is loud, service engine liht on


This is all tied to the service engine soon light.

When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

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The actual code he pulled would help, a lot. Maybe it was a p0420, small EVAP leak, but without the code he pulled I can't help you out much. Now, I can tell you, if you fix a problem it can take several drive cycles for the light to go off.

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Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
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I went to the gas station yesterday morning and immediately following adding gas the Check Engine Soon light came on. I checked the gas cap to make sure it was on tight and still the light stayed on. I...


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Sometimes if the gas cap is open while the car runs, the Check Engine Light turns on. This is common and happens on many vehicles. Try unplugging the negative part of your battery, let it sit for 10 minutes, then plug it back in and start the vehicle up. Most of the time the check engine light will disappear. If it persists, you might have to get a mechanic to clear the code and settle your check engine light.

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make sure the gas cap is on tight. vapor recovery system depends on the closure of the gas cap. if that did not solve your problem, I would suggest to get a new gas cap first, before going to the dealer or any repair shop for a turn-up.

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