Question about 2003 GMC Yukon Denali

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Flashing light issue/ a/c issue

My denali is a 2003 and my truck had the same issue and my wife drove it almost empty but finally found a gas station. my issue is when i turn it on to warm it up the whole truck jolts and it feels and sounds like it wants to turn off. car sounds and feels terrible. this morning the truck is running horrible and my wife calls and tells me about a flashing light and can only go so fast,it is struggling.while im here another thing is my a/c, cant turn it on because it is making a horrible noise as soon as i step on the gas and now even just in park. oh by the way before the flashing light issue the truck would run ok not great as long as i warmed it up for 5 minutes or more. appreciate any info and solutions

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  • GMC Master
  • 11,010 Answers

What flashing light ? Check engine ? You either have a bad engine misfire that could lead to a destroyed catalytic converter . Or a problem with Throttle Actuator Control (TAC) System. The A/C making a horrible noise , the A/C only has two moving parts the compressor an the compressor clutch coil , your compressor is locking up an you hear the serpentine belt . You'll burn up the serpentine belt . Your to vague in you posting suggest you take it to a qualified repair shop .

Posted on Mar 27, 2017

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6ya6ya
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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 2002 GMC Envoy 4x2

you have to take to the shop for correction. There is a computer update that will tell the system to adjust, and make it run fine. It happens frequently for all of you that have recently had your fan clutch repaired. Have to do the computer adjustment, which I only trust the dealer to do.

Posted on Nov 30, 2008

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SOURCE: HAVE A 1999 GMC SIERRA 1500 WONT MOVE IN FOWARD OF REVERSE

The torque converter has gone out.

Posted on Mar 05, 2009

polarcycle
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SOURCE: truck idles fine but has no power

Does the exhaust sound muffled? Could be a bad catalytic converter.

Posted on Mar 06, 2009

66 chrgr
  • 1011 Answers

SOURCE: 2001 GMC Yukon Flashing Check Engine Light

dear sir the flashing check engine light means the truck was misfiring at the time of the incident .If the light is still on you can go to auto zone they will pull the codes for you and reset the light if you like.but if running good now then probably nothing to worry about .

Posted on Mar 26, 2009

  • 1 Answer

SOURCE: 2002 gmc sierra denali rear axle noies

I have a 2002 Sierra Denali, and when it was only two years old, I began having the same issue that it sounds like you guys are describing. Luckily, I had opted for the extended warranty, because it turns out that the lube "specialists" at Wally-World had topped off my rear differential with standard rear-end oil. I turns out that the Denali's differential has a special "clutch pack", as they called it, that requires a secial, senthetic (aka: very expensive) lubricant. The **** WalMart added contaminated the diffy's oil, and caused the clutch pack to fail.... basically it started locking the rear axles, and not allowing one side to rotate at a different speed than the other, as is required in turning.
Well, it took the dealer nearly a month to acquire the neccesary parts for the repair, and as for the cost? Only a minimal deductible, and the dealer assured me that the $1800 extended warranty had paid for itself.... nearly twice!!!
WORDS OF ADVICE: If you own a Denali with AWS, Always instruct the lube guys not to touch your rear differntial! And have your certified GM mechanic check it at recommended intervals.

Posted on Nov 03, 2009

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