Downshifting issue with 19’ Z71

kargausa · March 5, 2020

You can hear what's happening just before you stop in this video, pay attention to the stops. My truck is 1400 miles on it and makes this noise frequently. I took my truck to service at least 7 times and they are telling me it looks fine! Created a case to GM support, and they even don't reply back my calls, emails. Please double check before you buy your dream truck and get used to live with this noise until it breaks something in the engine or transmission. I'm so disappointed to buy

Dnt · March 8, 2020

Tried different volume levels but the Audio just sounds like a lot of wind noise?

On the 8 spd transmissions I had 3 in a row 16 / 17 and 18 with the 6.2 16 had a harsh downshift occasionally/ 17 was a bit worse/ 18 only did it rarely. This 19 with the 10spd seems to upshift/downshift very smoothly, it is the best of the 4 trucks so far.

AJ'S · March 30, 2020

Yes this is very disappointing. I buy a new silverado almost every year since 2005. Usually a crew and it always has a 5.3L Z71 4WD. Never ever had a problem with my trucks until now. Just purchased a 2020 LT Crew Z71 with a 5.3L ,4WD and the 8 speed transmission which now has 750 miles on it. Very disappointed in the operation of this transmission. When accelerating up through the gears the transmission is flawless. When coming to a stop, a few feet before the actual stop, it feels like the truck has a shutter as the transmission is shifting down and actually working against you stopping. In most cases if the radio is off I can hear it as well as feel it. If coming to a stop and I shift into neutral the stop is nice and smooth like a stop should be. Have 2 recalls for the truck but none for the transmission. What gives GM these trucks are not cheap. Maybe my next one will be Ford or Dodge!!!!!!!!

TrkLegend · March 30, 2020

On 12/5/2018 at 6:35 AM, steve841 said:

GM is still working on software .. you should pass by the dealer and see if they have a software update.

I know on the 10 speed there is ....

I actually go in tomorrow to have the dealership buy back my truck because of this issue. GM told me don’t expect a fix or an update because we believe it’s working as intended. It’s all a joke, my service manager said they have used the update software line for 4 years now. Hopefully the 2500 2020 will treat me better.

RAYRAY78 · April 2, 2020

On 12/7/2018 at 1:24 PM, GMCustomerService said:

Hi, codyaxm. Please keep us update regarding your recent dealership visit, we hope your truck is back on the road running smoothly.

Anthony J.

RAYRAY78 · April 2, 2020

Yes gm customer service it would be great if you could help me. I've had my truck at the dealer 12 times 3 dealers 1st dealer flat out said they didnt have time. My opinion someone there should be with no job. 2nd dealer flushed transmission 3rd and best dealer yet I'm not sold on competent dealer has done everything from reprogramming it to last time torque converter. So after 12 trips I get my truck back yesterday now transmission temperature is at 230 degrees f and will not shift into 6th out of 5th and down shifts and never shifts back up. I have a bunch of videos of this whole adventure. I'm just before getting a lawyer all I want is what I paid 50 grand for a new truck to run and not be at dealer twice a week I've lost money from work and time .

mbfireboat · April 6, 2020

All I can say, not everyone is having this issue, but the transmission is probably sensitive any slight defect. My 2019 5.3 8-spd did the very hard downshift just before stopping right at the 4000 mile mark, but only for two days. It then resolved itself before I could take it back to the dealer and has not done it since. It upshifts and downshifts smoothly and actually seems like a pretty good transmission. I have 8000 miles on it now. The dealer did a tranny flush before I bought it.

I would be upset also if the problem kept up. It would be hard to live with. But the 8-speed transmission does work well as designed. Hope you get it straightened out.

Mike Travis · April 28, 2020

Try getting the dealer to apply this fix: #19-NA-244: Harsh 3-2 Downshift During Closed Throttle Coast Down When
Coming to a Stop- (Nov 1, 2019). May help fix your problem.

GMCustomerService · May 6, 2020

Hi, all. Please know, customer satisfaction is extremely important us. Our team would be more than happy to take a closer look into this concerns on our end. To do so, please send an email to [email protected] ATTN: Forum Username/GM Trucks with your contact information, VIN, brief description of your concern, and preferred dealership. We look forward to hearing from you. To learn more about GM's privacy policy, please visit http://bit.ly/2h3ZUnC.

Aleigha W.

Phantom 4D · September 19, 2020

Had a 2017 Silverado. Terrible issues with the six speed. They replace the torque converter, fluid flush, and all the other standard stuff. Worked good for a few months and started again. No help from the dealer. So I ended up taking a hit and traded it in on a new 2019 Sierra SLT X31. That was October of 2019. Truck has been great until today. Slamming hard in to first coming to a stop. So hard I thought we got rear ended. I tried coasting to a stop with little break, BANG. Tried a harder stop, BANG. Have just over 5,000 on the clock. I check trans fluid temp, 179f. Well within tolerance. Fluid is full, and appears normal color. Yes, I'm pissed. Service was already closed. I have a trip coming up in four days. A vacation. It was already put off once due to COVID. WE really need to get away. I will be towing a 20 ft enclosed trailer hauling two Spyders. Did I say I was pissed?

Mhr781 · April 1, 2021

I have a 2021 z71 RST 5.3 L V8 Silverado and I am having late downshifting problems. When I let my foot off the gas I continually feel a light engine downshift a few times until I come to a stop. Does anyone else have this issue?

RSVolcom · April 1, 2021

Have had the same issue on my truck just right before I stop. Had it serviced and updated months ago, seemed to hide the issue. Just started up again a month or so ago. Had my truck serviced this past Tuesday and mentioned it to him. Shook his head and said yup, that's happening to them. No true resolution at this time per him.

Mhr781 · April 4, 2021

On 4/1/2021 at 5:41 PM, RSVolcom said:

Have had the same issue on my truck just right before I stop. Had it serviced and updated months ago, seemed to hide the issue. Just started up again a month or so ago. Had my truck serviced this past Tuesday and mentioned it to him. Shook his head and said yup, that's happening to them. No true resolution at this time per him.

What year and package do you have on your truck?

Edited April 4, 2021 by Mhr781