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Transmission Software issues???

21205 Views 42 Replies 20 Participants Last post by  mud0227
Have a 2019 LT3 blazer with the V6 that has a jerking problem. It acts like the software tells the transmission move to 2nd gear, no 1st gear, no 2nd gear. It has also happens around 6th gear (guessing here) but dealer techs can't find an issue. No issue when Diagnostics is run. On the 5th trip to dealer I am told that is normal. Issue is most common in the lower gears.

Also have an issue on start-up and drive forward that results in a very pronounced jerking motion that the dealer tech denied experiencing; Until my 6th trip in when I am told that is normal as the car must Purge the air out of the system before driving. I should use my remote to start car so it has time to purge the air. The car is "working as designed." It also has the tendency to surge when you apply gas.

I also have one tire losing air, but nothing in the tire. I am having to put air in about once a week now. (21" low profile tires).

It also seems to have software issue and repeats it has a missing a SD card. I took 4 times of me turning car off and on to get it to clear on Christmas eve.

Anyone else seeing these issues?

Only thing positive is the nice ride when you get by the over issues.
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i have noticed some slight jerking behavior when pulling off from a dead stop- just started noticing that
I experience the surge every time I drive. Once you let off the gas, the motor will continue to rev up another 250-500RPM.
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Concerning, I just notice there is a service recall posted late Nov. I have no idea what it is for yet.
The recall is for the Hitch Cover.
"As of Nov 21, 2019 the following recall campaigns have not been completed on your vehicle:

N192270970​
RECALL SERVICE PERFORMED FREE OF CHARGE."​
I've noticed the exact same symptoms on mine and thought maybe I was being overly picky on how it performed. Mine is a 2019 LT3 V6 - had it only 2-1/2 months. I specifically listed those same issues in detail on the customer satisfaction survey that GM emailed me a few weeks ago. Now I have something else to bitch about other than the auto-stop-start system - but it seems to work in tandem because after the stop at a light or intersection, upon restart and go is when I get most of the jerk-shifting. Very displeased and starting to feel buyer's remorse.
I'll be visiting the dealer to address these issues with my first oil change, system checkup, etc. later this week.
You should keep in mind new cars learn your driving style. They take around 1-2k for the trans pcm and engine ecu to learn and perform best to your driving style. Ive noticed similar things in my 19 LT3 awd. But it has gotten better from the 50 miles it had when i got it the 1300 it now has a month later.
I was hoping that would be the case, but I'm at 3500 miles now. I thought it was doing better, until a 700 mile road trip. The vehicle loves the open road. It did not like returning to short city trips on 12/27. BUT thanks for the thought.
I was hoping that would be the case, but I'm at 3500 miles now. I thought it was doing better, until a 700 mile road trip. The vehicle loves the open road. It did not like returning to short city trips on 12/27. BUT thanks for the thought.
Same here - I'm at 4,250 and it loves the open road. Just not so much in city driving. I think we're past the "learning" stage.
Could always have the dealer reset it, so it starts the learning curve all over. That helped on another vehicle I had.
No transmission issues for me as of now, almost 2500 on the clock.
That is good to hear. I noticed my issues in week 1.
That is good to hear. I noticed my issues in week 1.
Depending on what the mileage was on delivery, perhaps it picked up bad habits from test drives?

?
6 miles. I'll check with the tech and see what he thinks. Thanks for your suggestion
I have a 2019 Blazer RS with the 21 inch wheels .My problem isnt with the tires.The car has 8000 miles on it ,is only 9 months old,and has been in the shop 3 times...currently where it is residing.The engine light will come on.Soon after that,taking off from a stop,the car will not shift out of 1st or 2nd gear...max speed is 25 mph.If the car is turned off for a bit and "rests" the trouble may happen,may not.The mechanic has only been able to duplicate the problem once making the fix difficult .Has anyone had this issue and,if so,how was it fixed.Currently the service manager is taking the car home for the weekend to see what happens,but since the engine codes have been cleared I dont feel real confident on the problem reoccurring. Oh yes,the dealership has a case open with GM.Probably should have waited for the 2020 Blazers but I needed a new car and,,after tons of research,picked my RS.
Oh my, I feel your pain. It just seem a few a us got a few lemons in year 1.
I've noticed a short hesitation when going from R to D even after waiting a second or two before gassing it. Hoping it won't get worse.
I've noticed a short hesitation when going from R to D even after waiting a second or two before gassing it. Hoping it won't get worse.
Hey, I have just noticed that hesitation. Plus, the Rear camera monitor will not turn off rear view display for a few seconds after going in Drive!

Another issue:This car was in shop for over 30 days (36) and Dealer Service said they fixed the transmission issue of that 25 MPH only and no Reverse after 500 miles, (Dealer said the fix was a throttle body rebuild, no parts, had to wait for parts from different locations!) . Anyone else have any transmission related issues with new 2020 Blazer? Thanks!

new 1LT, 2020 Blazer now at over 1200 miles
Hey, I have just noticed that .. and the Rear camera monitor will not turn off rear view display for a few seconds after going in Drive!
I've noticed a rear camera delay (randomly) also.
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