Jump to content

2019 5.3l 8 speed jolt when accelerating

Bmwtech113
 Share

Recommended Posts

Bmwtech113 Enthusiast

Bmwtech113

Posted
Posted

I have a 2019 AT4 with the 5.3l engine. I’ve had it for about a month now and I have noticed especially when I first take off after the truck has been sitting for a few hours that there is a jolt that will happen multiple times while accelerating up to speed. I’m not flooring it, just accelerating normally. It occurs between 10 and 50 mph and once it warms up then I never notice it again. Happens in D and also if it put it in L7 or L8. It feels like either a misfire or the transmission slipping. I just picked it up from my dealer tonight after they said “we’ve had other complaints but that’s just how it is.” 

Has anyone else experienced this?

  • Replies 49
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

UGADawgs
UGADawgs

I have the same lunge from 1-2nd if it's cold and I lightly accelerate. If I give it half throttle when cold, no issue. Also, no 1-2nd shift issues when warmed up. 

ShamrockShooter
ShamrockShooter

since I have driven 5 trucks and they all do it, I'm just going to accept it as normal and learn to accelerate harder that first shift of the day Sent from my Pixel 2 using Tapatalk

econometrics
econometrics

Yeah, get in line, OP. We're all having these issues with our 8 speeds. Lol!    My issues have been like UGADawgs'... whenever I baby the throttle, I notice the harsh shifting more than when

steve841 Enthusiast

steve841

Posted
Posted

Read an article earlier ... someone's filing a class action suit because GM cant get the 8 speed working correctly ....

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted (edited)
1 hour ago, Bmwtech113 said:

I have a 2019 AT4 with the 5.3l engine. I’ve had it for about a month now and I have noticed especially when I first take off after the truck has been sitting for a few hours that there is a jolt that will happen multiple times while accelerating up to speed. I’m not flooring it, just accelerating normally. It occurs between 10 and 50 mph and once it warms up then I never notice it again. Happens in D and also if it put it in L7 or L8. It feels like either a misfire or the transmission slipping. I just picked it up from my dealer tonight after they said “we’ve had other complaints but that’s just how it is.” 

Has anyone else experienced this?

 

Is it a shudder while accelerating in a gear or just when a shift occurs?

If it's a shudder, then there's a new fix for it. It's incredibly annoying that some dealers will play stupid, making comments like "that's just how it is".

TSB #18-NA-355

Print this article out and hand it to them:

https://gm-techlink.com/?p=11127

 

Here's a simple explanation of why the new fluid is the real deal:

 

"The base stock of old fluid (19355656) has the ability to attract low levels of moisture, which can cause degradation of the coefficient of friction of the fluid. The new fluid (19417577) has a new GTL (Gas to Liquid) base stock that is able to tolerate more moisture. Shuddering transmissions and torque converters have been recovered with the new fluid. New transmission fluid tests have been developed due this issue to prevent it from occurring with new transmission fluids."

Edited by HondaHawkGT
RMR Enthusiast

RMR

Posted
Posted

I have the 6 speed. On occasion, the torque converter will slip a bit on the 2-3 shift under mild acceleration. Feels like it disengages for a moment - engine spins up a smidge - then it re-engages. Only section of the drivetrain. Under no other conditions.

Bmwtech113 Enthusiast

Bmwtech113

Posted
  • Author
Posted
12 minutes ago, HondaHawkGT said:

 

Is it a shudder while accelerating in a gear or just when a shift occurs?

If it's a shudder, then there's a new fix for it. It's incredibly annoying that some dealers will play stupid, making comments like "that's just how it is".

TSB #18-NA-355

Print this article out and hand it to them:

https://gm-techlink.com/?p=11127

 

Here's a simple explanation of why the new fluid is the real deal:

 

"The base stock of old fluid (19355656) has the ability to attract low levels of moisture, which can cause degradation of the coefficient of friction of the fluid. The new fluid (19417577) has a new GTL (Gas to Liquid) base stock that is able to tolerate more moisture. Shuddering transmissions and torque converters have been recovered with the new fluid. New transmission fluid tests have been developed due this issue to prevent it from occurring with new transmission fluids."

The issue I’m having occurs while accelerating in gear, not while shifting. According to the article you posted, it doesn’t apply to the 2019 Sierra/Silverado. Can you confirm that it actually does apply to my truck?

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

If it were my truck, I would try it. Notice that the 2019 Colorado and Canyon are covered under it. It's possible they used the old formulation of Dexron HP in your transmission. Don't give up on it.

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
Posted

I asked my dealer. I have harsh 1-2 shift the first couple shifts in the morning when cold. Gm has a bulletin #16-NA-361 that says its normal due to the initial clutch fill time on the 2-3-4-6-8 c4 clutch. Advise customer it's normal and won't affect reliability or performance. Replacing transmission won't fix it. I have driven 5 19s so far and they all do it to some degree.

Sent from my Pixel 2 using Tapatalk

Z45 Senior Enthusiast

Z45

Posted
Posted

You are driving a computer so expect anomalies. 

Z45 Senior Enthusiast

Z45

Posted
Posted (edited)

fwiw  " The new fluid (19417577) has a new GTL (Gas to Liquid) base stock "

 

GTL base stocks are Gr. III.     There are five groups in the classification system, ranging from Group I – Group V:

 

Group I Characteristics
Group I base oils are the least refined of all the groups. They are usually a mix of different hydrocarbon chains with little uniformity. While some automotive oils use these oils, they are generally used in less-demanding applications.

• Group II Characteristics
Group II base oils are common in mineral-based motor oils. They have fair-to-good performance in the areas of volatility, oxidation stability, wear prevention and flash/fire point. They have only fair performance in areas such as pour point and cold-crank viscosity.

• Group III Characteristics
Group III base oils consist of reconstructed molecules that offer improved performance in a wide range of areas, as well as good molecular uniformity and stability. Manufacturers can use these synthesized materials in the production of synthetic and semi-synthetic lubricants.

• Group IV Characteristics
Group IV base oils are made from polyalphaolefins (PAO), which are chemically engineered synthesized base oils. PAOs offer excellent stability, molecular uniformity and improved performance.

• Group V Characteristics
Group V base oils are also chemically engineered oils that do not fall into any of the categories previously mentioned. Typical examples of Group V oils are esters, polyglycols and silicone. As with Group IV oils, Group V oils tend to offer performance advantages over Groups I – III. An example of a mineral-based Group V exception is a white oil, a very pure lubricant used in industries ranging from cosmetics to food processing.

Edited by elcamino
Darmichar Enthusiast

Darmichar

Posted
Posted

My 2018 spent 2 days at the dealer because of this.  I can't recreate it and the techs they send out play dumb and "don't feel it".  I can sometimes get mine to do it under ~75% acceleration climbing an incline (think on ramp going up).

Bmwtech113 Enthusiast

Bmwtech113

Posted
  • Author
Posted
1 hour ago, Darmichar said:

My 2018 spent 2 days at the dealer because of this.  I can't recreate it and the techs they send out play dumb and "don't feel it".  I can sometimes get mine to do it under ~75% acceleration climbing an incline (think on ramp going up).

That is when I notice my issue as well, going up an incline with steady throttle. 

UGADawgs Enthusiast

UGADawgs

Posted
Posted
2 hours ago, ShamrockShooter said:

I asked my dealer. I have harsh 1-2 shift the first couple shifts in the morning when cold. Gm has a bulletin #16-NA-361 that says its normal due to the initial clutch fill time on the 2-3-4-6-8 c4 clutch. Advise customer it's normal and won't affect reliability or performance. Replacing transmission won't fix it. I have driven 5 19s so far and they all do it to some degree.

Sent from my Pixel 2 using Tapatalk
 

I have the same lunge from 1-2nd if it's cold and I lightly accelerate. If I give it half throttle when cold, no issue. Also, no 1-2nd shift issues when warmed up. 

  • Like 1
ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
Posted
I have the same lunge from 1-2nd if it's cold and I lightly accelerate. If I give it half throttle when cold, no issue. Also, no 1-2nd shift issues when warmed up. 
I have noticed it mostly does it when I back out out of my driveway first then start going forward. This morning it was in the 30s, that first shift from 1 to 2 felt like the transmission slipped. Enough that it actually made my body go forward in the seat a bit like you you were shifting a manual. After that first 1-2 shift of the day it goes back to being normal.

Sent from my Pixel 2 using Tapatalk

UGADawgs Enthusiast

UGADawgs

Posted
Posted (edited)
11 minutes ago, ShamrockShooter said:

I have noticed it mostly does it when I back out out of my driveway first then start going forward. This morning it was in the 30s, that first shift from 1 to 2 felt like the transmission slipped. Enough that it actually made my body go forward in the seat a bit like you you were shifting a manual. After that first 1-2 shift of the day it goes back to being normal.

Sent from my Pixel 2 using Tapatalk
 

Yeah, exactly, but it's 70 here and it does it. But that's cold for an engine.

Edited by UGADawgs
ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
Posted

since I have driven 5 trucks and they all do it, I'm just going to accept it as normal and learn to accelerate harder that first shift of the day

Sent from my Pixel 2 using Tapatalk

  • Like 1

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
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      Post Pics of your "Other" Rides

      By KARNUT · Posted

      Well one of our most reliable vehicles was sold yesterday. The first and only I gave for free to a grandkid. If they got skin in the game they take care of it. My wife bought new. Five years later my daughter got it to use. We got it back and gave it to our grandson after graduation. He did zero maintenance just oil changes. When the AC quit he drove his mother’s car rather than get it fixed. Instead he just bought a beater and sold the Elantra. 
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      I usually do as well or better than the sticker for mileage. Usually better going west than east. North then South. Wind makes a difference. I’m not usually a conspiracy theorist. But it did dawn on me I’m going by the vehicle calculation. Now that would be interesting.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      https://www.msn.com/en-us/autos/news/fuel-economy-stickers-don-t-tell-the-whole-story-aaa-data-reveals-why/ar-AA26ocHk?ocid=winp2fptaskbarhover&cvid=6a4122ea3dae47e5b8dfbed5d4fd3d55&cvpid=648f6b4fc2fa4eddb4c12893aeb957ed&ei=59
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      What’s missing in all this is patience and investment in the future. Buy a 170K starter home. Ten years later sell it invest in a more expensive home. Eventually you’ll have a 600K home and pay starter home payments. Buy a starter car. Maintain it well. Save the payments after it’s payed for then buy an expensive car if you desire. Buy a tumbler make your own coffee, pack your lunch. Cook your own dinner. Most importantly take care of your car.
    • Atlas
      OCI, not when but why?

      By Atlas · Posted

      People mislead themselves. Statistics are highly useful indicators.   Here's the tie-in to this thread. If an oil sample tests shows a wear indicator of 7 using cheaper ACDelco oil, and a wear indicator of 2 (lower = less wear) using a particular brand of Mobil oil, and wear has a linear relationship with engine lifespan, anyone could assume that Mobil is reducing wear by more than 50% (let's just say a 200% reduction for you red state people trying hard to do math) which leads to increasing engine life by 2x. Perhaps, in a vacuum, by itself, when dreamed by AI.   Yeah?! That's what the statistic is saying, isn't it?   No, it isn't. It didn't come out and say engine life is doubled. That's a very bad assumption, and a case of severe myopia by assuming something potentially untrue about the only data point in focus.   Average cost of a new car is 50k. You bet it is.   The median cost of a new car is more like 35k. Expensive cars are skewing the perception that "average" now means a $50k price of entry for a very average automobile. And that's not true. People who don't understand statistics twist the living heck out of them to mean all sorts of things they don't actually mean.   "Average" new car payment is $1000/month. Yep, it is. And in that number are all the $35k new car buyers who bring significant equity, and the $25k new car buyers who finance the car for a month just to get a rebate, and then pay it off. Know what isn't in that number? All the payments made by people who don't finance a car.   Picking one's own data point (don't have a car payment, never paid $50k for a new vehicle, my house cost $170k, I afforded a middle class lifestyle on $4.50/hr) is just a data point. Just like earning $25/hr in an area where the median home price is almost $1 Million is a data point. In fact, it's a lot of data points given that 80% of the US population lives in/around major cities. They're not idiots; the vast majority of them do it to make a living because that's where the big money is.   The highs have become higher, lows have become lower, and how your personal mileage varies is not truth for an entire country. At the same time you can't NOT acknowledge the data. While it doesn't paint YOUR personal picture, it certainly tints the reality that you also live in, as does your single data point.    

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...