We bought a 2007 yukon denali used about 3 years ago. Intermittently (4 or 5 times a year) it does the check engine/service stabltrak/goes into limp mode. Historically it happens as you are almost a complete stop. Recently it has happened on the open highway going 70mph, twice in 2 weeks. I suspect condensation in some electrical component may be part of the problem because it tends to happen more in the spring & the fall when outdoor temps vary from 60s to near 90. I know other owners of same vehicle have had the same problem and I have read the comments on the internet as well. I have a mechanic acquaintance that has access to a GM analyzer. He has tried to help and has applied dielectric grease to two connectors of wiring harness under the hood and even did it to one under the dash under the instrument panel.that was a year ago. No problems all winter long. Late spring this year it happened again. I know that if it happens we must pull off the road, shut the vehicle off for about a minute or so, start it back up and it clears itself except for the check engine light. The check engine light will eventually go out on its own. GM has to know they have a problem. Too many people having the exact same thing. I have not found a definite solution. Everything I've read so far is a try this/try that remedy. Is there any common solution?

SOURCE: I own a 1997 GMC

The electrical harness between the steering column in these gmc units are troublesome. I just paid $500 (part $300) to have mine changed out on my 97 gmc yukon, but for 335,000 kilometers, no leaks, no oil consumption, not bad

SOURCE: Loud air intake engine noise on startup

I would guess it is the electronic fan clutch. It will cause the fan to run too fast (very loud) and the light will come on sometimes.

SOURCE: I have a 2005 Yukon Denali with 66K miles. For

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I had the same problem with my ’02 Denali and I took it down to a local shop yesterday to have a $60 computer diagnostic test done. They told me the catalytic converter was backed up and causing the misfire at high RPM. Easy fix. $230 later they put a new cat which did the trick. They also suggested a tune up (new plugs, wires, air filter, and fuel filter) which I will do myself tomorrow.

The shop also told me that by law, a catalytic converter has to be warranted my law for 80,000 miles. My problem was that I had 81,000 miles. I called some GM corporate number to see if they would plead my case ( told them the situation and wanted to see if they could offer some sort of GM business goodwill that they would “write off” and apply to my situation) They said all I had to do was take it to a GMC dealer and have it diagnosed for $100 and they could forgive me. The shop owner and his son highly suggested I get it done there since it would be covered but it was not convenient for me to drive across town to save a measly $130.00. Plus I really like the work this “mom and pop” shop does and value their honesty.

Here’s a little side info. The GMC dealership said that if it wasn’t covered under warranty, it would have been $900-1100 to change the catalytic converter. WOW! A much different price compared to what the local shop charged me.

Anywho, this post is getting rather lengthy but I saw you were having the same (or similar) problem and thought I’d share my experience in hopes that it might help. Just remember, the computers in today’s vehicles record EVERYTHING you do while driving your truck, from the top speed you drove to work this morning, to an engine misfire. The computer diagnostic will save you time and money by pinpointing the issue at hand.

I do not suggest taking it AutoZone (or the like) because their computer diagnostic is not detailed. I took it there for the heck of it (b/c the auto shop was closed down for the day) and they printed off about 8 different things it could be. And the one the tech at AutoZone suggested I do is the oxygen sensors – and the Denali has 4 of them @ about $99/each. Had I done that, I would have spent $400 and not fixed the problem.

And Firestone thinks highly of them selves apparently. They wanted to charge $180.00 just to plug in the computer and read a screen to tell me what wrong – that’s more than the dealership – yuck!

I wish you the best in solving this issue.

Colin Stickland

• 22516 Answers
• Posted on Jan 30, 2010

SOURCE: I have a 2003, GMC, Sonoma

warranty on a seven year old motor,you joking ,not sure of the fault though,have a feeling its the instrument cluster but it could be the ECU playing up as well ,what you need is an identical vehicle side by side and swop bits till you find the right one

Testimonial: "Thanks for the feedback alican!"

SOURCE: P0171 & P0174 Error Codes

For one thing, cleaning a MAF doesn't always work. Sometimes they just need to be replaced. Especially depending on what kind of cleaner you use on them, the cleaner can fry them. Also, both banks being lean and running worse when cold more points to a vacuum leak. Check around for any broken or loose vacuum hoses, and when the engine is cold and running poorly, you can use either carb cleaner or a propane wand to check for an intake leak. If the engine runs better for a couple seconds, you've found the leak.