Quantcast
2015 Denali/Yukon 6.2 thoughts - Beyond.ca - Car Forums
Results 1 to 12 of 12

Thread: 2015 Denali/Yukon 6.2 thoughts

  1. #1
    Join Date
    Oct 2011
    Location
    Lotus Land
    My Ride
    G37X
    Posts
    3,088
    Rep Power
    21

    Default 2015 Denali/Yukon 6.2 thoughts

    Thinking about trading in the 6-6 on a 2015+ Denali or Yukon 6.2(2014's apparently had engine issues.) Would use it to tow the Camaro to track days and daily drive in the winter/fall. Besides the horrendous fuel economy is there anything I should know about?

    https://www.youtube.com/watch?v=NAg3yRExGd4

  2. #2
    Join Date
    Jun 2009
    Location
    Calgary
    My Ride
    X5D, Fiesta ST
    Posts
    7,542
    Rep Power
    56

    Default

    The 8 speed trans seem to have some annoying drive ability issues, one of ours has shift flares on upshift and occasionally a 3 second delay when putting it into gear. The fuel economy isn’t as bad as I’d have thought, towing my company car with half tons usually is around 13-14L/100km at 120km/h.

  3. #3
    Join Date
    Oct 2011
    Location
    Lotus Land
    My Ride
    G37X
    Posts
    3,088
    Rep Power
    21

    Default

    Quote Originally Posted by Twin_Cam_Turbo View Post
    This quote is hidden because you are ignoring this member. Show Quote
    The 8 speed trans seem to have some annoying drive ability issues, one of ours has shift flares on upshift and occasionally a 3 second delay when putting it into gear. The fuel economy isn’t as bad as I’d have thought, towing my company car with half tons usually is around 13-14L/100km at 120km/h.

    That's actually not bad at all given the power. I typically drive 80% highway anyways for work.

  4. #4
    Join Date
    Jan 2008
    Location
    Upstairs
    My Ride
    Natural Gas.
    Posts
    13,332
    Rep Power
    100

    Default

    Do those years have the cylinder deactivation? If so, when not towing it should get pretty good highway economy.

    I like that engine. And those trucks too.
    Quote Originally Posted by killramos View Post
    This quote is hidden because you are ignoring this member. Show Quote
    You realize you are talking to the guy who made his own furniture out of salad bowls right?

  5. #5
    Join Date
    Jun 2009
    Location
    Calgary
    My Ride
    X5D, Fiesta ST
    Posts
    7,542
    Rep Power
    56

    Default

    Quote Originally Posted by ExtraSlow View Post
    This quote is hidden because you are ignoring this member. Show Quote
    Do those years have the cylinder deactivation? If so, when not towing it should get pretty good highway economy.

    I like that engine. And those trucks too.
    Yes they do. They are reasonably efficient for what they are.

  6. #6
    Join Date
    Aug 2012
    Location
    Down by the River
    My Ride
    GMC Sierra, LX570
    Posts
    831
    Rep Power
    13

    Default

    Some reported issues with a harmonic vibration - widely spread across GM trucks and big SUV's. I think mechanically they are pretty stout. Rare case of collapsed lifter because of cylinder deactivation.

  7. #7
    Join Date
    Apr 2005
    Location
    Calgary
    My Ride
    Buffalo Truck & An Angry Kitty
    Posts
    2,603
    Rep Power
    27

    Default

    Quote Originally Posted by ExtraSlow View Post
    This quote is hidden because you are ignoring this member. Show Quote
    Do those years have the cylinder deactivation? If so, when not towing it should get pretty good highway economy.

    I like that engine. And those trucks too.
    GM has had cylinder deactivation in their full size units since at least 2007. Strangely thought my 2005 Avalanche got better fuel economy than my buddy's 2008. Could just be driving style though.
    "Masked Bandit is a gateway drug for frugal spending." - Unknown303

  8. #8
    Join Date
    Oct 2011
    Location
    Lotus Land
    My Ride
    G37X
    Posts
    3,088
    Rep Power
    21

    Default

    I would certainly be deactivating any cylinder deactivation.

  9. #9
    Join Date
    Sep 2008
    Location
    Okanagan
    My Ride
    K-car
    Posts
    1,863
    Rep Power
    19

    Default

    Ours was very reliable, it's a 15 so it only has the 6 speed/6.2 which is still plenty quick. I got a bullydog tuner and that improved the shifting 100% as the factory tune always wants to see the next high gear, plus it eliminated the occasional hard shift while slowing down. I also got rid of the 22" wheels, the new body trucks seemed to really ride rough with them, 20's settled things right down. F/E was as stated not bad for a big rig with 420hp, but they recommend premium and thats what I ran especially with the tune. These are great trucks imo.

  10. #10
    Join Date
    Oct 2011
    Location
    Lotus Land
    My Ride
    G37X
    Posts
    3,088
    Rep Power
    21

    Default

    Thanks all. Always prefer real world reviews

  11. #11
    Join Date
    Aug 2004
    Location
    Calgary
    My Ride
    N/A V8, TTV6, DOHC N/A V6
    Posts
    3,196
    Rep Power
    43

    Default

    Big fan of the 6.2, driven one but own a 2015 5.3.

    Fuel economy is great, and Ive heard the 6.2 actually has enough grunt at our altitude to maintain V4 mode more often and is fairly close to the economy of the 5.3. I’d go for it.
    "The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents... some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new Dark Age."

    -H.P. Lovecraft

  12. #12
    Join Date
    Mar 2008
    Location
    Didsbury
    My Ride
    GTIR->SE-R->RDX->SLT->S60->LS460
    Posts
    430
    Rep Power
    17

    Default

    Quote Originally Posted by Hallowed_point View Post
    This quote is hidden because you are ignoring this member. Show Quote
    I would certainly be deactivating any cylinder deactivation.
    I'm running a 2014 SLT with the 6.2 and 6 speed. Running a Diablew tune since 50,000kms to de-activate the V4 mode and smooth out the shifts and she runs like a dream. Alot of the oil consumption problems are due to the cyclinder de-activation and with the Diablew tune I'm running the same (if not a little better) fuel economy without dropping to V4 mode.

    Had some lifter tick show up around 108,xxx kms and luckily it was covered under powertrain warranty still. Never towed before the lifter tick so I suspect mine was a one-off and I haven't seen any mention of it being a widespread issue on any forums.

    I also don't have the dreaded harmonic vibration some people have been experiencing.
    Stupidity is a disease we all have, it's like a form of brain herpes. Outbreaks will occasionally occur.

Similar Threads

  1. FS: 2003 GMC Yukon Denali XL

    By TomcoPDR in forum Trucks, SUVs, Vans, Trailers
    Replies: 3
    Latest Threads: 06-16-2011, 10:12 PM
  2. Yukon Denali

    By Dave P in forum General Car/Bike Talk
    Replies: 6
    Latest Threads: 01-04-2006, 10:14 PM
  3. Yukon Denali

    By benyl in forum Automotive News
    Replies: 10
    Latest Threads: 11-16-2005, 11:29 PM
  4. 2007 GMC Yukon and Denali

    By benyl in forum Automotive News
    Replies: 14
    Latest Threads: 10-09-2005, 08:39 PM
  5. jimmy and yukon denali

    By nickxero in forum General Motors
    Replies: 1
    Latest Threads: 01-28-2004, 05:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •