2015 Sierra Denali Trans Failure

[Snowcamo]

Question to The OP.

Did you or the others you know by chance notice a whining sound at any point? It would be very similar to a power steering wine like when the wheels are turning left or right on an older vehicle.

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[It's Tim]

1 hour ago, tjaudet829 said:

First off I want to thank those who defended me. 

I will try every avenue I can with GM to have them cover.

I have 3 friends and a son with Gm trucks 

2014 sierra 130k trans gone

2015 sierra 120k trans gone

2015 sierra denali 100k trans gone (mine)

2015 sierra denali 106k still chugging but owner is concerned

2018 Silverado my son just bought 20k ok for now

all of the above have 5.3L (not sure what trans on these) I have not driven all of these for 100k nor have I counted the number of shifts  

Were all these vehicles with issues subjected to a "transmission flush"?

 

[2017Darkness]

Depending on the flush chemical provider, i.e., BG, they will usually carry a warranty when using their chemicals for flushes.

[tjaudet829]

10 minutes ago, It's Tim said:

Were all these vehicles with issues subjected to a "transmission flush"?

 

I cannot say if the others were flushed or not.

I know the 2015 denali with 106k has not been flushed. still running too hmmm

 

[tjaudet829]

28 minutes ago, Snowcamo said:

Question to The OP.

Did you or the others you know by chance notice a whining sound at any point? It would be very similar to a power steering wine like when the wheels are turning left or right on an older vehicle.

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I cant say I have ever noticed a whining that wasn't there from day one.  I always thought my truck shifted weird (hard shifts I guess) also from day one. But how is one supposed to tell if it is normal or not. 

[tjaudet829]

1 hour ago, JimCost2014 said:

MYC in your RPO codes designates a 6 speed.

 

Let me find the code for the 8 speeds.

MYC-TRANSMISSION, 6 SPD AUTOMATIC

From my build sheet

 

[Snowcamo]

I cant say I have ever noticed a whining that wasn't there from day one.  I always thought my truck shifted weird (hard shifts I guess) also from day one. But how is one supposed to tell if it is normal or not. 

Ok cool deal

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[Ozer]

2 hours ago, Snowcamo said:

Question to The OP.

Did you or the others you know by chance notice a whining sound at any point? It would be very similar to a power steering wine like when the wheels are turning left or right on an older vehicle.

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Mine started whining like that few days before it finally went. 

I thought i was dealing with misfires, it drove like that. I changed plugs/wires/coils and still nothing. Turned out to be TC shudder lol Few days later i limped it to the dealer.

[Snowcamo]

Mine started whining like that few days before it finally went. 
I thought i was dealing with misfires, it drove like that. I changed plugs/wires/coils and still nothing. Turned out to be TC shudder lol Few days later i limped it to the dealer.

Thank you for posting this. I am tallying up the number of people who have heard this sound coming from the trans. It comes from the bell housing area typically. I believe it comes from the converter or pump. Likely the pump tho.
Appreciate it man[emoji106]

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[tjaudet829]

5 hours ago, Ozer said:

Mine started whining like that few days before it finally went. 

I thought i was dealing with misfires, it drove like that. I changed plugs/wires/coils and still nothing. Turned out to be TC shudder lol Few days later i limped it to the dealer.

I was on Highway with cruise on at 72 and thought my truck was missing as well. A mile or 2 later I exited stopped at light, took off and really had trouble shifting into second. Really never saw 20mph after that. 

[Snowcamo]

I was on Highway with cruise on at 72 and thought my truck was missing as well. A mile or 2 later I exited stopped at light, took off and really had trouble shifting into second. Really never saw 20mph after that. 

Was it cold outside at the time?

 

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[tjaudet829]

9 hours ago, Snowcamo said:

Was it cold outside at the time?

 

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Not really cold in the 40's car was warm too, I was prob 15 miles into a trip home from the store.

[Snowcamo]

Yeah that's cold enough. Mine doesn't start whining and clunky shifts till it gets below 50°f out.

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[Snowcamo]

Can you look through the grill of your truck and see if you have the active shutters?

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[tjaudet829]

22 minutes ago, Snowcamo said:

Can you look through the grill of your truck and see if you have the active shutters?

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no active shutters.  dealership has had it for 9 days...I have a loaner so I guess I don't care. waiting to hear from them if gm will cover this I guess.