check engine light

would oil cap from filler neck left off set off the check engine light. had oil changed at a gmc dealership. had truck serviced late tuesday afternoon and today, friday the light
came on, has only been drive roughly 150 miles from change to light coming on. truck is a 04 gmc sierra sle extended cab 4x4 with the 5.3 liter in it. i know its under warranty BUT dealer service dept isnt open again til monday. thanks for any info.
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sorry left out truck has 5,788 miles on it
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red_z snipped-for-privacy@hotmail.com (Charles H.) wrote:

Yes, probably would have set a Mass Airflow Sensor code.
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light now has gone off after putting cap back on, is there a code still stored or has it reset it self? i am takin it back to dealer on monday.
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There is still a code,and will be there until either the battery gets disconnected,or so many starts.Can`t remember how many.The light coming on has nothing to do with the oil change.
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ok thanks was wondering because after i put it back on, and after a few cycles it went off. thanks again for the info. the dealer is getting it first thing monday morning and the service manager is going to hear about it
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snipped-for-privacy@webtv.net (Bill) wrote:

You don't think that false air would have been drawn into the engine via the oil fill, bypassing the MAF sensor and triggering the light?
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thats what i was wondering, i am NO mech. thats why i asked here, nevertheless the dealer is getting it in morning to check and get a ear full.
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red_z snipped-for-privacy@hotmail.com (Charles H.) wrote:

I was replying to snipped-for-privacy@webtv.net (Bill) since he is pretty convinced that leaving the oil fill cap off had nothing to do with the check engine light coming on.
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here are the codes and what they found, is this a common thing on this truck? again truck is a 2004 gmc sierra 1599 4x4 w/5.3 P0171 P0174 P0300 also found PIP#3232A what are these codes? also they said cracked upper manifold. they said something it was plastic and air cooled, is this true? thanks for the advise and info
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opsss meant 1500 NOT 1599 sorry for typo
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