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The above article is lacking complete detail. It describes a GM service update for 2022 Refresh Chevy Silverado regarding a transmission shift issue. It does not clarify if that is for the 8 speed or 10 speed. It involves replacing the transmission control module and reprogramming it. One might think if its a Sliverado issue why is it not also a Sierra issue? I know my 2022 Refresh Sierra 1500 SLT ( 6.2 w/ 10 speed ) does not shift well at low rpm and low throttle. It is a bit jerky feeling. Put a small bit of additional and constant throttle to it and the shifts smooth right out.
Any 2022 Refresh Sliverado or Sierra owners feeling this issue?
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Same issue. 2022 Refresh Denali, 6.2 10 speed, 5500 miles. Been back two dealer two times so far. Waiting to hear back from them on if this TCM bulletin can be applied before scheduling 3rd visit. Very frustrating!
Do you have any updates on yours?
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The Bulletin itself is very clear that on certain Silverado and Sierra 1500 New vehicles may experience a Malfunction Indicator Lamp(MIL)and transmission shift quality may be impacted. Dealers are to replace the Transmission Control Module part number 24049788 and reprogram. This cover 8 speed and 10 speed transmission but not all vehicles. Your dealership can tell you if yours is cover under this bulletin…..
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teconk, I recently had my heated wheel module installed and they said they updated software/firmware for it. They also did the DRL update. They noted some other recall they would be checking which was a brakeline clearance issue on the rear chassis. That was number N222362040 but never showed for me at https://experience.gm.com/ownercenter/recalls.
Reading the transmission Service Update N222383250 summary on the NTSC website it says the applicability is ‘approximately 7 vehicles’.
https://static.nhtsa.gov/odi/tsbs/2023/MC-10229674-0001.pdf
Parts Man 1,
Thanks for the clarification. Just curious if the NTSB summary of ‘approximately 7 vehicles’ agrees with what you are seeing.
Does a Service Update also have a TSB or are they the same thing?
Thanks as always!!!
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Thanks for the feedback. For clarification, did any of the updates mentioned improve the jerky feeling you originally posted about?
For my saga, dealer said a slip was detected with diagnostic computer connected. They replaced fluid, zeroed/reinstalled TCM software and said issue was corrected. Then told me I had to drive it for 200 miles before making a final determination. Needless to say the vehicle still presented the exact same jerky feeling. Brought the vehicle back again and this time dealer claimed to have GM assigned an escalating TAC. GM engineer supposedly came to dealer removed pan to inspect and said everything is good. Test drove it and said transmission is working correctly. Again when I picked vehicle up from dealer there was absolutely no change. Sounds bad but I’m not sure if I believe that the dealer actually preformed all of the above. They really don’t seem like they know what to do with it since all diagnostics indicate it’s operating correctly. I personally feel it’s a torque converter issue. To me, during low load, low rpm operation the torque converter doesn’t know if it should lock up or not and feels like it caught in between. Press the accelerator a touch and it clears right up. Anyway, my plan is to take it back a third time in about 1k miles when 1st service is due. More to follow….
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teconk,
No update I’ve had changed this condition for me.
The shuddering/hesitating transmission shifts I have felt only occur when I accelerate lightly from any dead stop. When easing away at very light throttle position the 1-2 and 2-3 shifts feel irregular and jerk a bit. This is always only at low throttle position and low speed, If I stop and start again but tip into the throttle just another small amount the shifts go quite smoothly up through the 9-10 shift.
Converter lock up is set in the controller to occur at specific throttle positions and above and certain mph. Its a curve in the tune. In past 4L60e’s I’ve had it was just 4th gear where lockup occured. That setting can be changed in the tranny controller. I don’t believe what I am experiencing is a low gear converter lock up, since most GM’s typically… do not command converter lock in 1st, 2nd or 3rd. But it sort of feels like that… yes.
I’ve never had this condition set a light or throw a code.
Gerry-
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This reply was modified 5 months, 2 weeks ago by
Gemassie.
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This reply was modified 5 months, 2 weeks ago by
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Germassie, our bulletin doesnt tell how many are involved just what they want a dealership to do to fix the problem. I know they have been changing the fluids and it seems to have fixed the problems from what I’m hearing from the techs..
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Thanks Parts Man1. Any info as to what fluid they are putting back in, like maybe a GM part number? Thanks as always!
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The part number for the 10 speed trans fluid is 19352619..
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I am experiencing the same shifting problems and hesitation on my 2021 GMC Sierra AT4 6.2L. It hesitates very bad when accelerating from a dead stop. I have taken it to the dealership multiple times and they tell me that it is fine because it isn’t presenting any codes. This has only started in the last couple of months and it is quite frustrating. They have told me that there is nothing they can help with or do until the check engine light comes on and points them where to look.
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