2020 silverado intermittent 1-2 transmission slip

[Siebersh]

My 2020 Silverado has 3000 klm. and I have an intermittent 1-2 transmission slip it happens only on the first shift of the day....

[BlancoSilverado]

What engine/transmission do you have?

[Siebersh]

5.3 with the 8 speed 

[SILVER SLED]

GM is saying that's normal.....

 

#16-NA-361: Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle - (Aug 10, 2020)

Subject:

Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle

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Brand:	Model:	Model Year:		VIN:		Engine:	Transmission:
		from	to	from	to
Cadillac	ATS	2016	2019	-	-	-	Automatic 8L45 (M5N) 8L90 (M5X, MQE)
	CTS Models
	CT6	2016	2020
	CT4	2020	2021
	Escalade Models	2015	2017				Automatic 8L90 (M5U, MQE)
Chevrolet	Camaro	2016	2021				Automatic 8L45 (M5T) 8L90 (M5U, M5X, MQE)
	Colorado (VIN S, T)	2017	2021
	Corvette	2015	2019
	Express	2017	2021
	Silverado	2015	2018
	Silverado LD	2019	2019
	Silverado 1500 (New Model)	2019	2021
GMC	Canyon	2017	2021				Automatic 8L45 (M5T) 8L90 (M5U, M5X, MQE)
	Savana		2021
	Sierra	2015	2018
	Sierra Limited	2019	2019
	Sierra 1500 (New Model)	2019	2021
	Yukon	2015	2017				Automatic 8L90 (M5U, MQE)

 

Involved Region or Country	North America and N.A. Export Regions
Condition	Some customers may comment that the transmission exhibits a harsh 1-2 shift on the first shift of the day, typically under light throttle.
Cause	This condition is due to the initial clutch fill time of the 2-3-4-6-8 (C4) clutch.
Information	Some customers may experience a flare condition on the first 1-2 shift of the day or after the vehicle has been parked for several hours. The condition may have developed after the replacement of a complete transmission assembly or the replacement of the stator support to correct a delayed engagement condition. This is most likely to occur under light throttle conditions. Subsequent 1-2 shifts have acceptable shift feel. Replacing transmission components will not correct the condition.
Correction	Important: Replacing transmission components or complete assemblies will not improve the condition. The first 1-2 shift of the day may be harsh. The customers’ vehicle should be compared to a like vehicle under the same driving conditions. Do Not replace any parts for this condition. Note: This condition will not impact the designed performance or reliability of the

[Siebersh]

I don’t have a harsh shift my transmission slips 

[Chris Palfenier]

They are saying this happens under light throttle eh...  Guess I'll try hammer down when I leave home later and see if its smooth/I grenade transmission or it sends me flying thru my seat when it shifts.