Question about 2003 GMC Yukon Denali

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My 2003 gmc denali will not idle. It runs great on the road.

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Most likely a bad idle air control valve. Its only purpose to to adjust the idle for loads like the AC and turning the power steering..

Posted on Jul 05, 2010

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My 99 Yukon Denali 5.7, starts and idles great, but sputters while driving between 40 & 80kms, codes p0137 and p0131. We know what they are tho

Did u change distcap..may be corroded inside. There r two sensors gettn low voltage. Sounds like the othr is not heating properly too. A data stream run at a private shop is really helpful

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What Does GMC trouble code 1258 signify?

Four digit codes are brand specific. For GM vehicles, code 1258 means the engine computer is in default mode for an engine overheat problem. Most performance options are limited to allow you to get the vehicle off the road or to a shop for repairs.
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Sep 04, 2014 | 2003 GMC Yukon XL 1500 Denali

1 Answer

2003 yukon denali shuts off but still idles

Wait, shuts off but still idles? If you mean does not respond to throttle, this could be a "fly by wire" system which has a gas pedal sender unit prone to failure. "Lokar" makes a nice replacement unit reportedly better than stock.

Mar 05, 2014 | 2003 GMC Yukon XL

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Service stability message in my gmc yukon denali 2004

my 2003 is now saying this .. my mechanic said the struts are going out maybe this is your cars problem too ? just a thought but i Would go in for a free service check on that ride before something major happens on the road while your driving it

Dec 29, 2010 | 2003 GMC Yukon Denali

1 Answer


The transmission is lubricated from the torque converter side. there is no lube being pumped if the engine is not running. Either disconnect the shafts or leave the engine idling during towing.

Aug 16, 2010 | 2003 GMC Yukon Denali

1 Answer

Turn on the A/C and the truck starts idling funny and tried to shut off, if the A/C is turn off then the truck runs just fine . What is causing this problem?

Ether the ac compressor is trying to lock up,or the engine is not idling up to compensate for the ac,check out the idle air control valve,have a code reader put on it to see if there are any codes that will help diagnose the problem

Apr 11, 2010 | 2003 GMC Yukon Denali

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