Understood. If you find a solution, please post here...as I'm in the same boat. Would like to go with non-OEM shocks as I'm not pleased with the reports of low shock life. My 04 Yukon XL with HD trailer package was on original shocks at 219K miles...and I towed a 2 ton sailboat a lot!
Can't help you shocks as my 2015 Denali is still cooking (knock on wood). But I do know that somewhere on this forum I read about the resistor bypass kits. If memory serves they were a bit expensive but worth it from the standpoint of being plug and play. If I find that post again, I'll come back here and post.
2015 Sierra Denali with 6.2 and 8 speed.Lifted 2". I have just over 70K miles and she runs great. No shifting issues except 2nd gear is rough once in a while. With 20inch tires, at 38lbs of air I get 20-24 mpg sustained average for a 150 mile trip on the highway at 75mph. I've been reading all the issues with shocks, trannie, etc., and crossing fingers that I've avoided those due to all the recalls and notices having been done on the truck, including the trannie flushes. The only issue I have is a crackling noise coming from somewhere near the windshield....heard above 65mph. I came from a 2004 Yukon XL with 5.3 and 4 sped. 219K miles towing 2 ton sail;boat across country multiple times. No issues on that vehicle at all!
Last March 2019, I bought my new to me 2015 Sierra Denali with 6.2. 60K miles. It was idling so bad the dealer replaced the engine mounts which didn't solve the problem. I realized the P.O. made many trips to Mexico...and knowing how bad Pemex gas is, I threw in some Techron and started using 91 octane top tier fuel. I also have been running Seafoam as well. Now, after 10K miles and 2 trips towing 6Klb trailer...the premium gas and fuel cleaners have done the job. She starts without that huge shake, runs at idle smoothly with a little stumble now and then... and purrs at speeds. MPG's have gone up as well. Not using any cleaner now...just premium gas. Bottom line? Clean the fuel system. The 6.2 can be silky smooth then...IMHO.
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I guess I misjudged the title of this thread. Why? Because I have a true Rice Crispies crackling...like light rain hitting the windshield. It sounds like it's coming from the center of the dash. Reverberating all over the windshield back to both seats. 2015 Denali with 6.2. At speed, over 60mph, it sounds like someone is eating the cereal or it's raining. Little snaps, pops, etc.. It is not related to heat or cold. Not related to bumps. Can be smooth as silk and both the Admiral and I hear it plain as day. We both have spent time pressing on everything. No dice. Seriously, everything. All the dash trim, the radio trim, the seat trim, the A pillar area, the center console area, the overhead console area....nothing changes the sound...nothing. I even went outside and checked everything you guys have mentioned. Nothing's loose. The only wear item I found was the trim/windshield washer plastic piece that goes full length across the bottom of the windshield. I put some matchbooks under the piece and went for a ride. Nope. No change. At this point I'm now wondering if I have a microphone going bad (3 in the cab that I've found) (A Mazda/Toyota repair guy mentioned that possibility) or if the amp for the noise reduction system built in to the Denali with the 6.2 is going bad. The noise is getting worse. The noise reduction system is suppose to lessen the sounds in the cab. There's nothing left mechanical for me to press on that I've found. BTW, I did get all the recalls done, the moving/crunching seat noises going around a corner repaired, etc., ...and so far at 70K miles, she's still running great! I emailed my dealer in Tucson about this issue, haven't heard back (3 days now) which is unusual. I'll call them on Monday. So FYI....if you have a Denali with a 6.2...keep your hearing aids tuned for snap, crackle and pop that sounds like light rain on the windshield.
2015 Sierra 1500 Denali with 6.2/8speed. 70K miles All updates done. All fluid flushes done. Truck shifts almost perfectly all the time. I say "almost"... as every once in a while I get a hard shift, either up or down, to 2nd gear. All other gears are fine. Sometimes the shifts are so smooth, I can't tell what gear I'm in.... As far as V4 mode...that is seamless...in or out. At any speed. Crossing fingers my Denali is going to continue this way. She tows my trailer and sailboat flawlessly as well. I am having troubles (still) using cruise control on the hills (was taught to never use CC in hilly country)...but do love the way you set the speed for going downhill as you crest the hill and she will stay darn close to that speed going down...despite the 6K lbs trailer pushing hard! And my TPMS is way off.....to the dealer it will go next chance I get. But that's another story...
Morning Carson, Good idea...but nope for me. I've narrowed it down to the dash....maybe! I can hear similar sounds when I push on the dash around the instrument cluster. Although why the wife can hear it better when a passenger VS driving...I don't know. The dealer did take the headliner down to replace my sharkfin antenna...but they could not find the sound either when I asked them about it. They didn't have to look as it's below the threshold for noise repairs...but they are good people and did hear it. The tech who worked on the antenna was fairly certain he put the truck back together properly....as I had asked before the repair to make sure it was nice and tight. So I'm still looking. BTW, I towed 600 miles and it was there for a while at 70mph. Loudest at 77. My trailer tires are 75mph rated so I didn't stay there long...just enough to hear the noise. But then it was gone and didn't return until after the trip. Who knows?
2015 Denali 6.2, 8speed, 20inch tires and 3.42. Lifted 2.5" Average over 7K miles is 18.9. That's what I've put on the truck since I purchased her in March. That includes city, highway normal driving and towing 4200lb sailboat and/or 6500lb travel trailer part of the time. She gets about 3mpg's more than my older Yukon XL SLT with 5.3 and max tow. I'm happy.
Carson, I finally got to hear the noise my wife's been complaining about. It does sound like light rain hitting the windshield. But can't isolate the noise. However, It comes on strong around 70mph. Wind gusts don't change the sound, so know it's something internal. Finally got to thinking....I've got the 6.2ltr. And it has a noise cancellation feature that supposedly hears the noise then actively counters it. I'm wondering if that could be the issue? Either the system is hearing a sound it can't handle or it has a problem and is putting out a white noise. It does sound like it could be electrically generated! Ideas?
I replaced my 2004 Yukon XL SLT with a 2015 Sierra Denali. I'm a bit concerned about all this talk of the shocks going bad so early. My Yukon XL went 219K miles with only the front wheel bearing assemblies replaced just last year. It has towed my 4200lb sailboat across country and all over since day 1 of it's life. Original Shocks, brakes, etc.. I went with the GMC truck thinking I was getting the same quality. Here's hoping you guys are in the minority as I really don't want to start spending this kind of big bux on an expensive truck. I'm around 64K miles now on the Denali. Crossing fingers!
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