Question about 2004 GMC Sierra Denali

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Diagnostic codes? can anyone tell me what P0101 code indicates specifically? it says Mass or Volume Air Flow Circuit Range Proformance the guy at the auto parts store said the dealership would tell me what the code means but they were not cooperative.

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There are a couple of things that could be wrong.  First I would start by cleaning your Mass Air Flow sensor.  If you don't know where it is located it is just behind the air filter on the way to the throttle.  There will be a plug going into it.  The MAF could actually being going bad but it could also be a vaccum leak so check for those.  The last thing it could be is possibly your MAP sensor going bad and it thinks that the MAF is performing incorrectly.  Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!

Posted on May 26, 2009

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I had similar problems, and got exactly that code.
its ur MAF sensor thats goin bad and will not allow u accelerate above 2500rpm, stalls and lurches and attimes, stalls completely.
well i ordered for a replacement and changed it myself, it didnt take 30mins to have the replacement installed.
what the auto repair men were charging was outrageous.
so, get the part
replace it
reset the "service engine soon" (do this by removing d positive terminal on ur battery for some few mins)
and that should do it.
(i heard u could install the 2001 maxima MAF sensor, its cheaper, still researching to know how true that is though)
cheers

Posted on May 27, 2009

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Here is the difinition from the factory service manual
P0101 - Mass Air Flow (MAF) Sensor Performance
what does this mean? well in most cases you may have a defective MAF sensor, other things to check are the engine air intake hoses for cracks or loose clamps that would allow air to bypass the MAF sensor.

Posted on May 26, 2009

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