Jump to content

  

824 members have voted

You do not have permission to vote in this poll, or see the poll results. Please sign in or register to vote in this poll.

Recommended Posts

Posted

Seems like most 8 speed owners have the 6.2l. Would be interesting to hear from some 5.3l owners to see if they are affected like me.

Posted

I love mine, 2016 Sierra SLT with 5.3. First 3k miles were a little rough at times but at just under 5k it's now smoothed out.

 

Very rarely when the truck first starts up and you put it in gear it does a funny thing where it feels like the torque converter won't lock up. When pulling out of the garage (in drive, not on the gas at all) the truck barely wants to move, usually it will roll right out just idling. If I touch the gas at all it takes off kind of like you're "dumping the clutch" for lack of better ways to describe it. The problem goes away within a few seconds and doesn't happen often enough for me to really be concerned about it.

  • Like 1
Posted

Have never experienced a "butter smooth" shifting with this trans. Some starts, stops, better than others but never smooth. BTW truck built 12/15 4,100 miles.

Have you taken yours in to the dealer? What have they tried to fix it?

 

Mine had several re-learns and a new torque converter and while it has made the problems occur less, I still get some very large clunking.

Posted

I love mine, 2016 Sierra SLT with 5.3. First 3k miles were a little rough at times but at just under 5k it's now smoothed out.

 

Very rarely when the truck first starts up and you put it in gear it does a funny thing where it feels like the torque converter won't lock up. When pulling out of the garage (in drive, not on the gas at all) the truck barely wants to move, usually it will roll right out just idling. If I touch the gas at all it takes off kind of like you're "dumping the clutch" for lack of better ways to describe it. The problem goes away within a few seconds and doesn't happen often enough for me to really be concerned about it.

 

sounds like low on fluid - though I doubt it ...

Posted

I love mine, 2016 Sierra SLT with 5.3. First 3k miles were a little rough at times but at just under 5k it's now smoothed out.

 

Very rarely when the truck first starts up and you put it in gear it does a funny thing where it feels like the torque converter won't lock up. When pulling out of the garage (in drive, not on the gas at all) the truck barely wants to move, usually it will roll right out just idling. If I touch the gas at all it takes off kind of like you're "dumping the clutch" for lack of better ways to describe it. The problem goes away within a few seconds and doesn't happen often enough for me to really be concerned about it.

 

Here you go:

 

 

 

post-148085-0-40074100-1463260253_thumb.jpg

post-148085-0-40074100-1463260253_thumb.jpg

post-148085-0-40074100-1463260253_thumb.jpg

post-148085-0-40074100-1463260253_thumb.jpg

Posted

Was unhappy with how the truck shifted until I switched off the AFM cylinder deactivation with diablosport inTune. Absolutely love the way it drives now! I firmly believe that the 8 speed tranny issues most people are having relate to the trans trying to make up for the loss of power when AFM kicks in.

  • Like 2
Posted (edited)

2015 with 21000 miles. Love mine..... delays from park to whatever gear but I really couldn't care less. Shifts good and does what I want mostly. Just have to play with the tuning some more to get my shifts to 6100 rpm or so.

Edited by 1994Vmax
Posted

Play with the tuning? I don't want to tune the transmission to get it to shift correctly.... And ruin my powertrain warranty.

  • Like 1
Posted (edited)

Play with the tuning? I don't want to tune the transmission to get it to shift correctly.... And ruin my powertrain warranty.

Who cares about warranty.... I don't. Mine shifts absolutely fine... I just want the shift points higher, firmer.. etc... I rather enjoy my truck over the fear of god for some warranty they won't honor anyway lol.

 

I might see about the TSB listed above as mine is exhibiting that delay issue but I don't think I want some dealer numpty taking it apart and making it worse lol.

 

Sent from my SM-G900W8 using Tapatalk

Edited by 1994Vmax
Posted

I care about warranty.... It pays for repairs that otherwise I would have to pay for out of pocket. Actually, lots of people care about warranty on a $50k+ vehicle.

  • Like 5
Posted (edited)

That's my whole point....

 

If the truck/transmission was tuned they would have denied warranty work on the transmission.

 

And at this point they are offering trade assistance which I wouldn't have gotten either.

Edited by JacobC1983
Posted

That's my whole point....

 

If the truck/transmission was tuned they would have denied warranty work on the transmission.

Uh no... the point is tuning won't repair your transmission anyhow. .. What I choose to do with my truck is irrelevant to you.. and my tuning wasn't done as an attempt to repair something because there is nothing wrong with it. If I have to pay out of pocket to fix the delay issue I couldn't honestly care less... but I want to see people having it done and it actually doing as promised as lots of times these shots in the dark nets nothing. You asked and polled for people who like the 8 speed. ... I am one of them. Sucks yours is a lemon but it is what it is.

 

Sent from my SM-G900W8 using Tapatalk

Posted (edited)

No... The point is if you require warranty work on a tuned transmission the dealer will deny your claim and, therefore, many vehicle owners care about maintaining that warranty.

 

It does suck that mine requires warranty work, and I am glad mine wasn't tuned because this will end up costing me nothing for the repairs. In fact, I will end up with a model year newer vehicle for the price of a tune :)

Edited by JacobC1983
Posted (edited)

And nothing for your lost time... I have had mine for 20000 miles of driving and never seen the dealership once since I bought it. I would much prefer that. .. and warranty is irrelevant. I don't know why you care about my warranty so much lol... you honestly could have it if you think it will help your truck for all I care about it.

 

Sent from my SM-G900W8 using Tapatalk

Edited by 1994Vmax
Posted

For what it's worth, the diablo tuner I used doesn't even support the 8 speed yet. I only used it to switch OFF the afm in the ecm (engine cntl module) so no tune in the tranny.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts
  • Member Statistics

    342,758
    Total Members
    8,960
    Most Online
    Randy Ginoza
    Newest Member
    Randy Ginoza
    Joined
  • Who's Online   4 Members, 0 Anonymous, 2,066 Guests (See full list)


  • Latest Articles

  • Posts

    • Paid $2.72 for E85 today.
    • Welcome back! No, it definitely doesn't pass the sniff test. Even "ceasefire" needs an alternative definition these days.    $5.29 at Kroger today
    • That makes sense, and I think you are describing the real product problem. Capturing data is the easy part. If the owner or technician has to manually dig through five minutes of millisecond-level logs, the product has already failed. The device would be at the ECM harness, not at the OBD port, so I agree that data retrieval and event marking need to be thought through carefully. The way I am thinking about the architecture is: The recorder itself should not depend on a phone, app, Bluetooth, Wi-Fi, or cloud connection to capture the event. It should always keep a local rolling buffer and lock the event locally. A button, phone app, or small cabin device would only act as an event marker. If the driver feels a stumble and presses the button 10–30 seconds later, the pre-buffer has to already contain the useful data. For data retrieval, the practical options would be a sealed service USB lead, Wi-Fi download, or a phone/cabin companion device. I would not expect the owner to remove the ECM-side module or work with raw files directly. The cloud or AI side would be for interpretation, not for capturing the event. The truck may have no connection when the issue happens, so the evidence has to be saved locally first. After that, cloud processing could help decode the data, compare it against baselines, and generate a readable report. For the first version, I would keep the automatic triggers conservative and objective: driver event marker bus-off error passive voltage drop / brownout device reset FIFO or queue overflow a normally periodic message disappearing side-to-side communication mismatch, if the topology supports that For “learning normal,” I agree with your point, but I would not want to overclaim it as automatic root-cause diagnosis at first. A realistic first step would be learned baseline comparison for that specific vehicle and operating condition. For example, a value would only be compared against similar conditions: RPM range load / MAP throttle position gear / vehicle speed coolant and oil temperature battery voltage AFM/DFM state, if decoded and validated Then the report could flag things like: this periodic message disappeared compared with its normal timing this value deviated from this vehicle’s normal range under similar conditions the same abnormal pattern repeated after the same type of event the anomaly occurred together with voltage, oil-pressure, misfire, or communication changes But I would still call that “abnormal pattern detected,” not “replace this part,” unless there is enough validated repair data behind it. So the intended product would not be “here is a huge log.” It would need to be an event package: what triggered the capture how much pre/post data was preserved what changed before and after the event whether the device itself reset, overflowed, or saw a bus error selected graphs around the event raw data only as supporting evidence From your perspective, what would make this kind of report useful instead of just another datalog? For example: What are the top 5 parameters or events you would want highlighted first? Would you trust a learned baseline for that specific vehicle, or would you prefer fixed thresholds? How much false-positive flagging would be acceptable before you stopped looking at the reports? What would a one-page report need to show for an independent shop to take it seriously? For misfire, AFM/DFM, oil pressure, or U-code complaints, what would you want the tool to flag automatically?
    • 2024 Silverado 2500 HD LTZ grille no camera Parts list   84603331 84913656 84913657 84913654 84913655 84911567 84911568 85646092 85646093 85797921 85797922   11570637  x10-15   grille/bumper bolts 11546500  x10      grille clips 11571006  x10      push/retainer clips 11546454  x6       nut retainers 11611609  x6       M5 bolts 11610700  x6       molding/trim retainers
    • And use RA's 5% discount code if you buy from them.  google for the code, one is always available.
  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...