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I just bought a pre-owned 2015 Yukon Denali and I Love it!
I've been waiting for the feel of a big V8 engine with 4 wheel drive so this girl can dirty on any road.. It's beautiful and I'm SO happy to own a sexy Denali.
I've only had it for two weeks so I'm learning every thing about it with each drive. So far the engine purrs and all gauges read level. It's got 98k mi on it
so I'm expecting it to have some wear and tear. So just yesterday morning I pulled away from a stop sign and gave a good rev got up to 50mph in a few sec...
and as I approached a slow zone I took my foot off the gas.. lowered speed to about 25 then gave it a little more gas while going up a slight hill in the road and I hear what sounded like a knocking noise. I took my foot off the gas and the sound went away. So on the drive home where I have to ascend up to about 2200 ft elevation it did it again as I was coasting and had to accelerate from 25 to around 30 mph I kept my foot on the gas this time (engine sounding smooth as silk) and continued uphill about 45mph and the sound went away. It's always a short knocking/rattling sound. Not in the engine but below me, definitely upfront.
I've got an appt at GMC next week but until then I'd love to figure it out. Not sure what other details you need but any one got any idea?
Around 15K I had the transmission issue with it slipping and the dealership replaced the fluid with the mobile 1 which seem to resolve it enough that i could live with. The transmissions still clunks into first when down shifting but whatever. Well now at 30K I have something similar going on, but seems just slightly different. When I'm cruising around 35-40 it almost feels like the truck is braking or downshifting and then speeding up, but enough everyone in the truck can feel it. At first i was thinking it was the DFM kicking in and its opening and closing valves so i bought a pulsar box ( i needed it for tires and autostop/start as well) and disabled the dfm, but it still does this weird shimmy. I know that doesnt necessarily still mean its not dfm but... still.
This may sound crazy, but its much worse when its really hot outside and the truck has been sitting for bit. This morning it was cloudy and about 80 degrees. Didn't notice it too bad when i left, but this afternoon it was about 95 (truck had been sitting in the sun for several hours) and when i went to leave even the passenger was thinking i was about to run out of gas once we leveled out around 40. After stopping and going a few times it settles down enough that its back to just being very subtle, but still noticeable.
Is anyone else experiencing something similar? Is it DFM, Torque converter, transmission or just something i will have to trade out to resolve.
I appreciate any answers that are offered up because i really, really don't want to get rid of this truck.
Welcome to my build!
Started with a 2019 Silverado 1500 LTZ 4wd 5.3L, which I bought with 9k miles on her in August of 2020. Got a crazy good deal on it, justified me driving to Georgia from Houston to pick it up. It even came with the Ranch Hand front bumper on it already, other than that she was stock.
Little bit of background on my past trucks, I've been fortunate to own quite a few: 07 JK Wrangler, 08 Silverado 1500 LT Z71, 2014 GMC Sierra 1500 SLT Z71, 2015 GMC Sierra 1500 SLT w/ 6.2L, 2016 Denali 2500 Duramax, 2017 Silverado 1500 LTZ Z71, and finally my 2019 Silverado 1500 LTZ Z71. I also have my 2015 ZL1 Camaro for a little bit of fun on the side, my wife has gone off to German side and is rocking her Porsche Cayenne.
So here's the current list of mods:
4" Zone Lift kit w/ Fox rear shocks 35x11.50's Nitto Terra Grapplers on stock 20's Front and back Ranch Hand bumpers Hooker Blackheart Cat-back exhaust utilizing factory dual tips K&N Series 63 cold air intake Rough Country Automatic drop down steps Camlocker Tool box Front windows tinted to match back factory tint Front windshield tint strip Chevy All-Weather floor liners Stubby antenna
Just went on a shopping spree of sorts and this is what I've got on order:
Boost auto parts auto fog mod Putco Blade LED Tailgate Light Bar w/ Putco wiring harness All LED bulbs; replacing turn signals, license plate lights, and reverse lights. And the GRAND finale, King 2.5 PRS coilovers
The list of things to come in the near future:
High Country cluster from White Audio and Media, had their Tahoe cluster in my 2017 and it was fantastic! Waiting to order the rear King Resi PRS shocks until my checkbook bounces back a little bit. Lol Going to be putting on several LED light bars and maybe a pod or two, going to do my best to blend them into the Ranch Hands and make them as non conspicuous as possible. I'm strongly considering doing a Dyno tune w/ Kooks long tubes as well. Going to be doing ceramic tint all the way around. Limo on back windows and back glass, 15% on front windows, and 35% on the front windshield. I've got a drop in plastic bed liner that drives me crazy, so I'll more than likely go ahead and get the bed sprayed.
Things I'm considering:
Looking into changing up the rims and trying to clear 37's when the time comes for new tires. Blacking out the badges? Still not sold on this one... Turbo or a supercharger kit? This one would be way down the line though. Anything else that catches my attention, let me know if you can come up with anything!
Here is the truck from stock:
For sale is a set of tri-fold running boards in great shape, includes required module.
These can be retrofitted to 14-18 trucks using a harness, there is a topic on how to install these.
Retrofit harness can be purchased from
$500 local pickup, will drive to meet for the right deal
By TruckGuy 94
I have a 2011 GMC Sierra Denali with a park assist problem I’m hoping someone can help me solve. A couple months ago, I started getting a sporadic “park assist blocked” error. This is pretty common as the sensors are covered in snow in the winter. However, I then noticed the sensors began to work sporadically even if they were clear. A month or so after that, the message changed to “service park assist” and the system automatically disables itself. The button on the dash shows the system is off all the time and when I try to turn it back on, the orange light flashes for two seconds but then disables itself again. I’ve checked the fuse and unplugged the battery but have not been able to get it to reset. Does this seem like a sensor issue or a control module? Any ideas for next steps? Unfortunately since the system is disabled all the time I can’t check to see if one sensor is malfunctioning as I’ve read about on other forums.
Update: when I started my truck once this week it randomly worked for 10 seconds then disabled itself again and hasn’t worked since.
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