Jump to content



Photo
- - - - -

New 8 speed software update?


35 replies to this topic

#1 MrNasty

MrNasty

    Enthusiast

  • Member
  • 102 posts
  • Location:Texas
  • Gender:Male
  • Drives:2015 Slverado 6.2 High Country 4x4

Posted 18 June 2017 - 04:40 PM

I took my truck in to have the coolant loss checked and because I also had delayed engagement into drive. Already had stator assembly replaced a few months ago and it went away temporarily but came back and seemed worse. The dealership said GM sent them a TCM update for my truck and they wanted to install it and see if it would help before going into the trans. I got the truck back and not only has the delay went away, it shifts better in all the other gears as well. Before when I drove it in tow/haul it downshifted to first real harsh as well and no longer does. Plus all the other usual gear hunting and clunks are gone. Its only been a couple of days but thought I would post this as there are still a lot of people dealing with 8 speed issues.

2015 Silverado 6.2 High Country 4x4, Leer hard tonneau cover, Bedrug,Fabtech  lift, 34x12.5 BFG KO2, Ranch Hand bumpers, Bushwacker  flares, Helo Wheels -12 offset, Debadged, Flowmaster exhaust, dual battery setup, 2500watt inverter, GM metal skid plate kit,


#2 SkiDooNick700

SkiDooNick700

    Enthusiast

  • Member
  • 450 posts
  • Name:Nick
  • Location:Michigan
  • Gender:Male
  • Drives:2015 Sierra CC 4x4 6.2L NHT

Posted 18 June 2017 - 04:48 PM

You know, my truck was just at the dealer too. I thought that it seemed to be shifting noticably smoother. Maybe there was some update applied that they didn't tell me about. Or my 8spd has just been having a couple of its good days recently.

2015 GMC Sierra SLT Crew Cab 4x4 Standard Bed Max Trailering. 6.2L.

 

dd81fc3f-daaa-43f9-9496-ad1912c8e816_zps


#3 jimmygmc

jimmygmc

    Enthusiast

  • Member
  • 41 posts
  • Name:Jimmy
  • Gender:Male
  • Drives:'15 Sierra SLT 6.2

Posted 18 June 2017 - 07:20 PM

Did they tell you of a TSB? If so let us know!!



#4 MyFavTruck

MyFavTruck

    Ten soldiers wisely lead will beat a hundred without a head &

  • Member
  • 1,566 posts
  • Name:Darryl
  • Location:TN
  • Gender:Male
  • Drives:2017 GMC Denali Ultimate

Posted 18 June 2017 - 09:10 PM

yes please get the exact TSB number. At first oil change I am going to have this done. This 2017 (almost exact same truck as my old 2016) is much worse than my 2016 ever was with harsh downshifts and crazy gear hunting. I have been holding off to let it LEARN but at 2000 miles it seems to be a slow learner LOL



#5 MrNasty

MrNasty

    Enthusiast

  • Member
  • 102 posts
  • Location:Texas
  • Gender:Male
  • Drives:2015 Slverado 6.2 High Country 4x4

Posted 19 June 2017 - 04:17 AM

I will look on my paperwork when I get home and see what it says.

2015 Silverado 6.2 High Country 4x4, Leer hard tonneau cover, Bedrug,Fabtech  lift, 34x12.5 BFG KO2, Ranch Hand bumpers, Bushwacker  flares, Helo Wheels -12 offset, Debadged, Flowmaster exhaust, dual battery setup, 2500watt inverter, GM metal skid plate kit,


#6 NathanFugett

NathanFugett

    Enthusiast

  • Member
  • 15 posts
  • Name:Nathan
  • Location:Vardaman,Ms
  • Gender:Male
  • Drives:2016 Chevrolet Silverado LTZ 2wd 6.2l

Posted 19 June 2017 - 06:08 AM

I also had some issues with my 8spd, it makes some crazy harsh downshifts sometimes. And when driving around town slowly it doesn't shift smooth at all , I first of all blamed it on having to relearn also because I killed my battery a while back but installed new battery and its been at least 1,000 miles since then and it still doesn't the same thing. I need to check into this software update also!



#7 NathanFugett

NathanFugett

    Enthusiast

  • Member
  • 15 posts
  • Name:Nathan
  • Location:Vardaman,Ms
  • Gender:Male
  • Drives:2016 Chevrolet Silverado LTZ 2wd 6.2l

Posted 19 June 2017 - 10:04 AM

Just called in to the dealership about mine and told them what was going on, the service manager told me that they have had numerous amounts of the 8 speeds come in with those same problems and GM keeps telling them that this is normal. If this is normal I will definitely be getting rid of my truck which I hate to do because I love the truck but don't like the trans problem. They said that she thought GM was working on a fix but hasn't told them anything yet to call back in a couple weeks to check and see. Also service manager said that they have put in complete new transmissions and it changed nothing it performed the same . So I dunno Im gonna wait a few weeks and see if maybe GM has something come out for it but I don't care what they say if it is normal operation then they need to pull the damn thing off the line up and start from scratch.



#8 acc412

acc412

    Enthusiast

  • Member
  • 92 posts
  • Gender:Male
  • Drives:2016 GMC Sierra 1500 SLT All-Terrain

Posted 19 June 2017 - 10:06 AM

Just called in to the dealership about mine and told them what was going on, the service manager told me that they have had numerous amounts of the 8 speeds come in with those same problems and GM keeps telling them that this is normal. If this is normal I will definitely be getting rid of my truck which I hate to do because I love the truck but don't like the trans problem. They said that she thought GM was working on a fix but hasn't told them anything yet to call back in a couple weeks to check and see. Also service manager said that they have put in complete new transmissions and it changed nothing it performed the same . So I dunno Im gonna wait a few weeks and see if maybe GM has something come out for it but I don't care what they say if it is normal operation then they need to pull the damn thing off the line up and start from scratch.

If only those idiots (GM) would contact any reputable turner company considering they know how to fix the shift points lol. 


~Cole 

 

2016 Sierra (5.3L) SLT All-Terrain Arctic White 

CURRENT MODS: RC leveling kit,  20" Anthem Rims, 275/55/20 Toyo AT2 Extreme, 20% Tint all around with 60 % on the front window and a 5% strip, Elite Engineering Catch Can, AFE Momentum GT CAI , Carven Progressive Series Cat-Back.

 


#9 Mileguru

Mileguru

    Enthusiast

  • Member
  • 12 posts
  • Name:Ryan
  • Location:Los Angeles, CA
  • Drives:2006 Sierra Crew Cab 5.3L with Magnuson Supercharger 4-speed and 4.10 gears

Posted 19 June 2017 - 10:38 AM

If only those idiots (GM) would contact any reputable turner company considering they know how to fix the shift points lol. 

 

That's PRECISELY what I was about to say! You could get HPTuners or Corvettes of Westchester to tune the transmission, but you'd have to research what that does to your warranty (and it also costs money that we shouldn't have to spend to fix a GM problem).


Edited by Mileguru, 19 June 2017 - 11:12 AM.


#10 acc412

acc412

    Enthusiast

  • Member
  • 92 posts
  • Gender:Male
  • Drives:2016 GMC Sierra 1500 SLT All-Terrain

Posted 19 June 2017 - 10:52 AM

 

That PRECISELY what I was about to say! You could get HPTuners or Corvettes of Westchester to tune the transmission, but you'd have to research what that does to your warranty (and it also costs money that we shouldn't have to spend to fix a GM problem).

It will void the warranty that's the issue. 


~Cole 

 

2016 Sierra (5.3L) SLT All-Terrain Arctic White 

CURRENT MODS: RC leveling kit,  20" Anthem Rims, 275/55/20 Toyo AT2 Extreme, 20% Tint all around with 60 % on the front window and a 5% strip, Elite Engineering Catch Can, AFE Momentum GT CAI , Carven Progressive Series Cat-Back.

 


#11 MrNasty

MrNasty

    Enthusiast

  • Member
  • 102 posts
  • Location:Texas
  • Gender:Male
  • Drives:2015 Slverado 6.2 High Country 4x4

Posted 19 June 2017 - 05:30 PM

Ok, I took a picture of my paperwork. It has a tsb and SLF code# (whatever that is) hope it can help some of you like it has me. Truck is still shifting great so far.

I did read in another unrelated post that some one else had gotten an 8 speed update and truck is also much better and his has been in for a couple of months. So it all sounds promising.

df80662f33d1379b4aa80a36706428b2.jpg

Sent from my SM-G935V using Tapatalk

Edited by MrNasty, 19 June 2017 - 06:15 PM.

2015 Silverado 6.2 High Country 4x4, Leer hard tonneau cover, Bedrug,Fabtech  lift, 34x12.5 BFG KO2, Ranch Hand bumpers, Bushwacker  flares, Helo Wheels -12 offset, Debadged, Flowmaster exhaust, dual battery setup, 2500watt inverter, GM metal skid plate kit,


#12 NathanFugett

NathanFugett

    Enthusiast

  • Member
  • 15 posts
  • Name:Nathan
  • Location:Vardaman,Ms
  • Gender:Male
  • Drives:2016 Chevrolet Silverado LTZ 2wd 6.2l

Posted 19 June 2017 - 07:53 PM

Dealer is supposed to contact me back and I will ask him about this particular bulletin


Edited by NathanFugett, 19 June 2017 - 08:04 PM.


#13 Blue17

Blue17

    Enthusiast

  • Member
  • 10 posts
  • Name:Been called many things
  • Location:The Mountains
  • Gender:Not Telling
  • Drives:2017 LTz 6.2 & all the goodies

Posted 20 June 2017 - 06:14 AM

Let us know how it works, That TSB came out in Jan


Edited by Blue17, 20 June 2017 - 06:16 AM.


#14 Crstfr

Crstfr

    Enthusiast

  • Member
  • 394 posts
  • Name:Chris
  • Location:Austin Tx
  • Gender:Male
  • Drives:2016 GMC SIERRA 1500 SLT All-Terrain Summit White

Posted 20 June 2017 - 08:07 AM

Ok, I took a picture of my paperwork. It has a tsb and SLF code# (whatever that is) hope it can help some of you like it has me. Truck is still shifting great so far.

I did read in another unrelated post that some one else had gotten an 8 speed update and truck is also much better and his has been in for a couple of months. So it all sounds promising.

df80662f33d1379b4aa80a36706428b2.jpg

Sent from my SM-G935V using Tapatalk

Thanks for this.. .i have this same issue.. took it in once, they cant replicate... go figure... i'll be showing them this next time i go in!


2016 GMC SIERRA 1500 SLT All-Terrain Summit White

                "Born to Fish, Forced to Work"

 

#15 dgirouard39

dgirouard39

    Enthusiast

  • Member
  • 28 posts
  • Name:Derrick
  • Location:York PA
  • Drives:2015 GMC Denali

Posted 20 June 2017 - 01:15 PM

We have # for this. Mines going in on Monday. Would like to save a trip


Sent from my iPhone using Tapatalk



Reply to this topic



  


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users