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Hesitation from engine and Hard shift when going forward

Drew Bellucci
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Drew Bellucci
Drew Bellucci

Anyone else experiencing a hard shift or hesitation of the engine when you first hit the gas. For example, I start the truck, reverse out of the driveway, put the car in drive and when I hit the gas,

ShamrockShooter
ShamrockShooter

Look up bulletin #16-NA-361 harsh 1-2 shift upon first startup shift under light throttle. GM says it normal on the 8 speed. It has something to do with the initial clutch fill time of the C4 clutch.

UGADawgs
UGADawgs

I have the same cold start 1-2 shift hesitation and lunge. I do the same coast method as zzrsouth. Once in 2nd, can't stop, accelerate and reproduce. It doesn't happen again until the next morning. So

econometrics Senior Enthusiast

econometrics

Posted
Posted

This has happened to my A8 2x now. The first time - as others have reported here - was when I was in reverse, then went to D and applied a steady bit of gas. 

 

The second time was today. Since it happened the first time, I've learned something... whenever I reverse out of a parking spot, I bring the truck to a complete stop, put it in D, then slowly accelerate for the first 10-15 yards. Today, I could sense the truck was going to "clunk" as I was backing out of a parking spot, but then putting it back into D to pull in more straight to park. I let off the gas and it did not clunk as hard at all. I could actually FEEL the transmission slipping a bit, so I didn't apply the gas, then it found the gear. 

 

Conclusion... the more I come to complete stops before shifting, then letting the truck sit for 1-2 seconds in D before moving forward, the less of these occurrences I have. 

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  • 2 weeks later...
  • 3 weeks later...
potato Enthusiast

potato

Posted
Posted

My company has 3 at4's and an slt and they all do this.  I got the same run around from dealer, "couldn't duplicate it, here is a bulletin saying it's normal".  Pretty disappointing.  

pcontant Enthusiast

pcontant

Posted
Posted

Glad to find this post, describes very well the same issues i’m experiencing. What is very disappointing is there is no fix.  GM engineers need to get their thinking hats on and find a solution. 

  • 3 weeks later...
anthony2558 Enthusiast

anthony2558

Posted
Posted
On 7/23/2019 at 4:24 PM, econometrics said:

This has happened to my A8 2x now. The first time - as others have reported here - was when I was in reverse, then went to D and applied a steady bit of gas. 

 

The second time was today. Since it happened the first time, I've learned something... whenever I reverse out of a parking spot, I bring the truck to a complete stop, put it in D, then slowly accelerate for the first 10-15 yards. Today, I could sense the truck was going to "clunk" as I was backing out of a parking spot, but then putting it back into D to pull in more straight to park. I let off the gas and it did not clunk as hard at all. I could actually FEEL the transmission slipping a bit, so I didn't apply the gas, then it found the gear. 

 

Conclusion... the more I come to complete stops before shifting, then letting the truck sit for 1-2 seconds in D before moving forward, the less of these occurrences I have. 

Good info and all, but we shouldn't have to do this. With the delay mine has, if i floored it without giveing it 2 secs fully stopped in drive the trans would prob drop out. You could put my ram in drive with it still rolling back ever so slightly and it would go just fine. I just cant understand why GM cant fix this. 

Daveman93 New Member

Daveman93

Posted
Posted
On 7/22/2019 at 9:50 PM, Walter Gill said:

I am having the same issue. 

The dealer keeps telling me it is operating as designed 

it clearly isn’t. Hesitation, hard shift, surge forward, sometimes almost dies at idle and sounds like it misses in the exhaust on occasional start up. 

I stomp it when coming from reverse to forward.  Might as well rip the rear end out before warranty runs out.....lol

B.R.67 Enthusiast

B.R.67

Posted
Posted
On 3/17/2019 at 9:40 PM, Drew Bellucci said:

Anyone else experiencing a hard shift or hesitation of the engine when you first hit the gas. For example, I start the truck, reverse out of the driveway, put the car in drive and when I hit the gas, the truck goes toward and then i feel the truck completely stop for a second (hesitation) and then it continues forward, I only expierence this when I’m going from reverse to forward.  I come to a complete stop and do not shift to drive when moving backwards still. ?

Mine just did the same thing today and has done it before. just add it to the list of issues with this thing. I'm just happy when it starts up the first time I push the button.

DaveHC Enthusiast

DaveHC

Posted
Posted (edited)
On 8/19/2019 at 8:46 PM, potato said:

   My company has 3 at4's and an slt and they all do this.  I got the same run around from dealer, "couldn't duplicate it, here is a bulletin saying it's normal".  Pretty disappointing.  

Same issue with my 19 SLT, 5.3 8 speed, about 3-4 times weekly on first driving off...dealer kept over night and guess what... couldn't duplicate customers issue, operating normal, sucks, mine also does it after reversing and going to drive sometimes, after its been driven all day,GM has a fix, they will probably shitcan the8 speed and go to 10  speed in most all. the only fix I know is trade it for a ram or ford, or a 6.2, with 10 speed gm but they might have other issues.

Edited by DaveHC
LT4Banger Enthusiast

LT4Banger

Posted
Posted
1 hour ago, DaveHC said:

Same issue with my 19 SLT, 5.3 8 speed, about 3-4 times weekly on first driving off...dealer kept over night and guess what... couldn't duplicate customers issue, operating normal, sucks, mine also does it after reversing and going to drive sometimes, after its been driven all day,GM has a fix, they will probably shitcan the8 speed and go to 10  speed in most all. the only fix I know is trade it for a ram or ford, or a 6.2, with 10 speed gm but they might have other issues.

Same issue... so close to making my way to the Ram dealership. 

lebag335 Enthusiast

lebag335

Posted
Posted

Reminds me of a Hurst slam shift. She’ll shift or she’ll blow! Drive it like you stole it. 

  • Haha 1
Codywa New Member

Codywa

Posted
Posted

Not sure if this is the same issue but mine last night I put it in reveres and it kinda slammed I backed up 15 feet put it in drive started to slowly accelerate only made it 10 feet or so forward and it felt like the transmission popped out of gear and my back tires locked up, but it put it back into reverse and was able to move the truck, I tried several more times it did the same thing. Left me stranded, I hopped In it today and is working just fine. Anyone know what this may be?

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