2020 Chevy gas harsh downshift

Nathan Leslie · February 24, 2020

2020 Gas motor. Noticed that when coming to a stop there is a harsh downshift possibly from 2nd or 3rd to 1st. It is not violent but can definitely feel it. Anyone else having this?

TrucksAndDogs · February 25, 2020

2020 GMC 2500 Diesel - have had for 4 weeks .... have experienced a harsh downshift a couple of times. Certainly not frequent. Trying to notice what conditions it occurs ... recall it happening once while on a slight forward incline.

mkeddie · February 25, 2020

Diesel is a different story cause of the 10 speed....but
Ive been told the trans need to learn how to shift like a break in

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SkidooSteve12 · February 25, 2020

22 hours ago, Nathan Leslie said:

2020 Gas motor. Noticed that when coming to a stop there is a harsh downshift possibly from 2nd or 3rd to 1st. It is not violent but can definitely feel it. Anyone else having this?

In Tow/Haul mode or not? I get that when in Tow/Haul mode coming to a stop the engine breaking/transmission downshifting helps and it definitely downshifts and the RPM's jump up to 3000-4000 RPM's. But just normal driving I do not get that effect.

Double check that your Tow/Haul mode isn't turned on.

Nathan Leslie · February 25, 2020

It is not in tow haul mode. I have done some towing with it as of recent but felt the bump when it was not in tow haul. Its sometimes more subtle than others. Its just something odd to me. maybe I am overreacting.........

SkidooSteve12 · February 26, 2020

I haven't felt anything like that during normal driving. The only weird transmission shift that I've felt about 4-5 times is when I'm coasting and slowing down around 45 mph and then touch the gas pedal and it clunks when finding the right gear.

Nathan Leslie · February 26, 2020

1 hour ago, SkidooSteve12 said:

I haven't felt anything like that during normal driving. The only weird transmission shift that I've felt about 4-5 times is when I'm coasting and slowing down around 45 mph and then touch the gas pedal and it clunks when finding the right gear.

I have felt that one also.

Girthyhawg · July 22, 2020

On 2/25/2020 at 12:26 PM, Nathan Leslie said:

It is not in tow haul mode. I have done some towing with it as of recent but felt the bump when it was not in tow haul. Its sometimes more subtle than others. Its just something odd to me. maybe I am overreacting.........

My truck is 2 Weeks old, this past weekend I took a 10hr road trip, everything was fine until I got off of interstate. 3 times in a row when I stopped for redlight or sign I felt same thing with a jerk.. like rear wheels were hitting a speed bump. Came back home, truck drove normal with minor hard up shifting... when I got to dealer after another 10 hours to drop off, it happened again but not as severe. Dealer said the saw no codes, but would keep an extra day to see if they could simulate.

Stand By · July 24, 2020

I feal it sometimes when turning a corner. Also the decel-accel lag described above. So far just chalked it up to normal mediocrity at a premium price.

BC225 · October 14, 2020

I have felt the same thing as u described. Just under 5000 kms on truck.

newdude · October 14, 2020

Sounds like every 6L90 since 2007.

InTrouble · October 16, 2020

Had the same thing happen a couple days ago from 2nd to 1st on a very slow deceleration. Trucks 3 weeks old about 1500 miles. Previous 3/4 ton I owned had the 6l with 6speed I would get a similar reaction sometimes on slow decel. The new 6 speed has been beefed up slightly with a heavier spring pack and clutches according to some info from GM I ran into somewhere. So, that and the unit being new and still learning may be the issue, time will tell.

William M. Campbell · October 29, 2020

I had service done at 12,000 and told chevy dealer that my transmission was not working properly, around 40 when driving in town it shifts up and down a lot, hard clunk sometimes when shifting from reverse to forward. The dealer said that they had installed the wrong fluid and that they would change it. Has anyone else had this problem. I have not had the fluid changed as of yet, I was wondering if that is just a ruse.

Dunn · November 7, 2020

had both downshift coming to stop (3rd to 2nd gear i beleive) and the 45 mph one......but its very infrequent and i just chalk it up to being a new truck......i dont get alarmed too easily but if it becomes more frequent and or more violent i would check it out.......otherwise ill let it break in and see what happens dtl......in tow haul mode have not had one issue......mine are all in normal mode

be nice if they had a mode right in middle between tow and normal....that would be a really sweet spot for this truck imo

mine is 6.6L gas

Rewopleahcim · November 10, 2020

On 2/24/2020 at 12:43 PM, Nathan Leslie said:

2020 Gas motor. Noticed that when coming to a stop there is a harsh downshift possibly from 2nd or 3rd to 1st. It is not violent but can definitely feel it. Anyone else having this?

I have experienced this many times. Slow deceleration around 20km/h. Brought it to the dealer and big surprise, they couldn't duplicate it. 2020 6.6 Gas, started feeling this at 1000km mark, It has about 5000 kms now, still doing it.