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GMC Yukon / Yukon Denali



  • tdohtdoh Posts: 298
    Does your '03 have RPO codes UQ7 and Y91 (dunno for sure if Y91 was available in '03)? If so, then you'll need TNR unit (p/n 10377531 or equivalent 15230099), along with the GPS antenna and nav disc (if it isn't already included with the nav unit--try to get v3.0 if possible, unless you're looking to pinch a few dollars)...all this assuming that the existence of the above-mentioned RPO codes are truly indicative of the equipment actually installed in your truck. Y91 is the code for the Class-II amp (aka, luxury amp) used to amplify the audio coming from the Bose headunit; if you have UQ7 but no Y91, then you have the non-Class II amp (aka premium or "dumb" amp--so called because all it does is amplify the incoming analog audio signal, unlike the Class-II amp, which IIRC processes Class-II data signals) which case you'll need to get a TNR meant for the dumb amp (I forget the exact p/n for the non-Y91 TNR).

    Pricewise, TNR units go for around a little over a grand on eBay (when someone offers one for sale) and $1670.22 at
  • just2bigjust2big Posts: 1
    has anyone had a problem with the sensors after putting bigger rims and tires on their denali,,,,,my message on my dash says "tire pressure monitor"... i know its from the bigger rims but is it a problem or is it no big deal ,,,in other words,,,should i get the sensores put on the new tires,,,thanx
  • gmfan007gmfan007 Medford, ORPosts: 77
    Curious to know if anyone has dealt with the computer read out of fuel used. Ours consistently reads one gallon less than what is actually pumped at the gas stations.

    I have heard there is a "metering" adjustment needed. If so, is this an easy fix? And, how do you access it? Thanks for the help.
  • denalimandenaliman Posts: 16
    Whoever switched your tires and wheels forgot to take the sensors out of your stock wheels and put them in your new ones. Thats why your tire pressure monitor lights are on. The sensors are reuseable.
  • lobsenzalobsenza Posts: 619
    The fuel economy on my last 2 GM vehicles displayed an optimistic value. I don't think it can be fixed. My Lincoln LS displays the fuel economy right on the money. I tested both vehicles with a series of fillups and averaged the results. My 01 Denali reads about .5 MPG high. My 1995 Olds Aurora read a full MPG high.
  • gmfan007gmfan007 Medford, ORPosts: 77
    Thanks for the input. I had our Yukon in to the dealer today for the steering clunk thing. They could find nothing wrong with the DIC info. A "pool scan" of the gas tank revealed 7.3 gallons in the tank and the DIC showed 18.6 gallons used. So, that adds up correctly to almost 26 gallons .... the size of the tank. At this point, I'm not sure why we get conflicting figures. They said there is no adjustment possible.

    Our '98 Pontiac Grand Prix with trip computer consistently shows fuel used to be exactly what is pumped (w/fill up) at the gas station.
  • dilbertzzzdilbertzzz Posts: 190
    I had the "steering clunk thing" in my 2003 YXL. The service advisor said they had been having trouble (must mean a TSB exists) with the "Intermediate shaft." They replaced that part (under warranty, of course), and solved my problem decisively.
  • jasjas Posts: 115
    I will see about a .5 - .75 mpg error with my computer calculation, which I believe is to be expected. I think both fuel used and mpg calculations are based off monitoring the fuel flow which will have a margin of error. Also, with the bigger tank over the Grand Prix, the error may be larger. When filling mine, when the pump first kicks-out, I can put in an additional .75 - 1.25 gallons. The way the tank filler tube is routed can have an impact on how accurate you can fill the tank - another margin for error.

    FYI, I have a 04-BMW that is showing a mpg calculation difference of 4-5 mpg. Now that is a problem.
  • jasjas Posts: 115
    I had the same problem at about 32k. The shaft had to be lubed. They re-designed it to correct the problem. They took care of mine under warranty also. Hopefully the redesign will not present a problem down the road.
  • gmfan007gmfan007 Medford, ORPosts: 77
    Good point, thanks. I hadn't thought about the sizes of the tanks contributing to margin of error. The Grand Prix only has an 18 gallon tank.

    As you say, toping off the tank could also be a factor. I live in Oregon where it has been determined that we are not competent enough to pump our own gas ... state law prohibits. So that factor is out of my control.
  • steverstever Posts: 52,683
    I'm next door and every time I visit Oregon I hang out by the attendants and don't let them squeeze extra gas in. Over filling the tank can mess up the vapor recovery system. One click of the pump should do it, but even if you stop at the first click, you're still going to have variations from one tank to the next.

    Steve, Host
  • jasjas Posts: 115
    You gave me a good laugh. I am sure there is a 2 year program somewhere, that when completed you too will have the full knowledge and expertise to perform this highly technical task.

    Isn't government great? Do they let you wash your own windows?

    I live in a neighboring state (CA) and not that we are any smarter, but our gas station attendants, in most cases, lack the skills to perform this task. In fact, most don't even speak the language that we could communicate to them how much gas we wanted.
  • gmfan007gmfan007 Medford, ORPosts: 77
    I think State officials' responses are that pumping your own gas would take away many filling station attendants' jobs. (I suppose that is why our gas prices are some of the highest in the nation.) I'm wondering how Oregon ever allowed autos into the State in the first place. Think of all the horse farriers who were left with no jobs.

    I like your idea of the 2 year program. Maybe we could start it out with the folks at the capital (Salem) where all the great inspiration originates.

    Windows washed? Check your oil? Tires? You bet! Just remember to bring your own water, rags and air compressor w/generator. You're lucky if they get your gas in a timely manner.
  • ocmike3ocmike3 Posts: 232
    My 2001 D DIC was pretty accurate, usually within 0.1-0.3 mpg from my calculation, much better than the DIC on my wife's Volvo.
    I think the state pushed the no self pumping in Oregon to create jobs during one of the many recessions. (Sort of like all the make work jobs in Europe)... or on the conspiracy theory side, it's Multnomah county's way of trying to encourage more people off the road by making them wait for someone to notice them and come out to fill their tank....
  • tdohtdoh Posts: 298
    Just to add to the "no self serve in Oregon" chatter--maybe some of them gas attendants need some more training...or perhaps a hearing aid. I say this 'cuz during a stop at a gas station while up there, I had informed the attendant--twice, just in case he didn't hear me correctly the first time--to fill up my DXL w/ premium when he asked me which grade of gas to pump. Walked away assuming that he heard me right, but after a short time, something in my head told me that I should make sure. I think you've already figured out what I was gonna say any case, the guy claimed that I said "regular" unleaded. Guess he either didn't hear or understand me, even after I told him the second time...and this is why I should let people like him pump gas for me???
  • stanggerstangger Posts: 1
    I first encountered the no self-pump law in New Jersey apprx. 6 years ago, having lived and worked in the deep south all my life it was quite unusual to me. When I asked a local official the reasoning behind this I was informed that the state of New Jersey had deemed gasoline vapors to be carcinogens and therefor did not want all its citizens inhaling gas and getting cancer.... Which made me wonder, would it not be better for everyone to inhale fumes once a week as opposed to 10% of the teenage population inhaling fumes 8hours a day 3-5 days a week? Just food for thought
  • steverstever Posts: 52,683
    Any new owners want to unlurk and brag about their ride?

    Steve, Host
  • dsgnwildsgnwil Posts: 1
    I have a 1997 Yukon GT, 2 door. I am having problems with the rear seat folding. I would like to replace the entire bench with a new 60/40 option but I am not sure if it will fit. Does anyone know if this is an option? By the way I love my Yukon!!! It is 8yrs old with only 70K miles, Burgundy and beautiful.
  • dcdchaudcdchau Posts: 41
    I have a 02 Yukon SLT, it's a great truck. I have been having this windshield noise on the passenger side intermittently. It sounds like a vibration of the onstar antenna or something loose near the sun roof. It is so intermittent that I can only hear it when it's windy and with highway speed. The dealer as I expect told me that can not reproduce the problem... I took it in yesterday while the wind is gusting outside and they admit that they can hear the noise but unable to determine the cause. They keep my truck overnight and try to fix it today.

    I wonder if any one out there have had the same problem? If so, please post your repair or TSB if any.

    I will post a repair details if the dealer can fix it. Stay tune... and thank you for reading this. Thank you forums.
  • obyoneobyone Posts: 8,054
    Body - Windshield Area Wind Noise

    Bulletin No.: 04-08-48-003

    Date: June 14, 2004

    Windrush Around Windshield (Install New Windshield Reveal Moldings)

    2002-2004 Cadillac Escalade
    1999-2004 Chevrolet Silverado
    2000-2004 Chevrolet Suburban, Tahoe
    2002-2004 Chevrolet Avalanche
    1999-2004 GMC Sierra
    2000-2004 GMC Yukon, Yukon XL
    with Hood Air Deflector

    Built Prior to the Build Dates shown.

    Plant Build Date
    Pontiac Assembly 12/17/03
    Flint 12/19/03
    Ft. Wayne 12/15/03
    Oshawa 12/17/03


    Some customers may comment on noise coming from the windshield and door area.


    This condition may be caused by the installation of a hood air deflector. The deflector may change the path of the air across the vehicle, causing the left side and right side windshield reveal molding to make noise.


    Replace the left and right side windshield reveal molding. Refer to the Windshield Side Reveal Molding Replacement procedure in SI.

    Parts Information

    Parts are currently available from GMSPO.

    Warranty Information

    For vehicles repaired under warranty, use the table.
  • dcdchaudcdchau Posts: 41
    obyone, many thanks... Will ask the dealer to check this TSB out. They found some loose part inside the truck, under the dash area and tightened it. I don't think this will rectify my wind shield noise. The TSB you mentioned will. Especially mime has the hood guard installed. Thanks again obyone and thank you forums.
  • tdohtdoh Posts: 298
    I would but I'm not a new owner... ;-)
  • Looking for comments on aftermarket exhaust
    systems for the 6.0. Considering a Flowmaster
    or Spintech but am concerned with resonance
  • tireguytireguy Posts: 200
    Has anyone replaced their stock 265/70R17s with 285/70R17s? BFG All-Terrain T/A is the only tire I've seen in this size. They'll fit on the stock 8" rims, but I'm curious how they fit otherwise. I have a 2004 Yukon XL 4x4 with 3.73 gears.
    The Firestones seem to be lasting pretty well. Typical, since I can't wait to get rid of them.
  • obyoneobyone Posts: 8,054
    Official GMSPO Licensed Product

    Got one installed. All stainless, a bit pricy, and to me worth every penny.....
  • denali856denali856 Posts: 118
    I have an '02 Denali (6-CD changer) which is starting to have intermittent problems playing CDs. It's like there's some dust/lint on the lens or something, and occasionally it skips though most of the time it plays perfectly. Anyone have any experience servicing/cleaning the CD player?

    Thanks in advance for any responses.
  • jasjas Posts: 115
    I went with a pretty free flowing Magnaflo muffler, but did need to add resonators to maintain a fairly quite highway ride. Nice little added sound on acceleration with minimal noise on the highway. Check out post #2663 for the parts.

    The big trick for me was to add two pipes (one each side). Slide the spare tire back toward the bumper by remounting (put the hoist through one of the spokes and use a 12" bolt with washers to fasten the other end to the frame. There is a hole in the frame that allows you to do this).

    Works easy on a XL - gives you enough room to run a second pipe between the rear axle and the tire.

    My buddy did it on a non-XL which was a little more tricky, we got a slightly smaller tire, then did the same thing. He had 20's on his ride, so the slightly smaller tire was not a huge deal, but in case of a flat, you don't want to run on it very long or at very high speeds due to the AWD.

    My big concern on the second pipe was I did not want to run it too close to the brake lines. I used the insulation on a couple parts just to insure no problems. I also added it above the resonators and muffler to make sure I did not get any noise. Probably not necessary, but if you buy a sheet of the insulation, you might as well use it.
  • We put hid conversion into 02 Denali and are interested in having low beams stay on all the time, even when high beam is switched on. Is there a way to accomplish this?
  • tmayertmayer Posts: 1
    I have a 2003 Yukon XL and was wondering if a roof rack from a similar year Suburban Z71 would fit in the same mounting holes. Does anyone know?
  • My SUV's has appox.117,000 miles on it. Over the pass several years I noticed a slight coolant leak now getting worse. The problem exist on my wife's 1998 GMC Suburban. Has anyone else had these problems? Or did I just pick 2 winners. And does anyone know of a recall related to this problem? Thank you in advance for your advice.
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