2015 Sierra Denali Trans Failure

[Snowcamo]

just got off the phone with my service tech.  the exact cause is "transmission damage due to transmission fluid pump failure"
wonder if the flush @75k had anything to do with this?
 
 

Hey did you ever get the trans repaired?

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[tjaudet829]

I heard from my service rep that GM was going to help out but to what extent he couldn't tell me.

I had to agree to pay the labor fees of $1975. this would cover labor only no part. I gave consent 8 days ago now.

GM wanted to know what it would take to repair...or if it needed to be replaced.

So I am still waiting to here what parts and how much GM will cover.

Still in a holding pattern, I do have a dealership loaner so that definitely helps with the whole rent a car deal.

I will continue to update as I receive info.

Thanks for the follow up!

 

[Snowcamo]

I heard from my service rep that GM was going to help out but to what extent he couldn't tell me.
I had to agree to pay the labor fees of $1975. this would cover labor only no part. I gave consent 8 days ago now.
GM wanted to know what it would take to repair...or if it needed to be replaced.
So I am still waiting to here what parts and how much GM will cover.
Still in a holding pattern, I do have a dealership loaner so that definitely helps with the whole rent a car deal.
I will continue to update as I receive info.
Thanks for the follow up!
 

2k is knocking on what it would cost at a local shop who can use sonnax parts to upgrade and fix the real issues within the trans. Just an fyi.

I can respect going through gm though.

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[Snowcamo]

Throwing this out there so you can see your parts cost of high quality parts vs gm labor and parts.

https://transmissioncenter.net/shop/6l80e-6l90e-raybestos-high-performance-rebuild-kit-6l80mk-pterodactyl-1r/

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[tjaudet829]

 

2k is knocking on what it would cost at a local shop who can use sonnax parts to upgrade and fix the real issues within the trans. Just an fyi.

I can respect going through gm though.

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yea I know it probably gonna be more $$ but its been there 3 weeks I have had a 2020 Acadia Denali for the entire time at $0 cost. so that is worth something to me.

I have been pretty loyal to them and hope that pans out for me when the final $$$$ comes in

[tjaudet829]

 

Throwing this out there so you can see your parts cost of high quality parts vs gm labor and parts.

https://transmissioncenter.net/shop/6l80e-6l90e-raybestos-high-performance-rebuild-kit-6l80mk-pterodactyl-1r/

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thanks Sno

[Snowcamo]

thanks Sno

No prob im wondering how this turns out. Let us know Dude[emoji106]

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[el_er1c]

On 1/6/2020 at 3:44 PM, Snowcamo said:

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

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My 2015 5.3 6-Speed w/ about 115k is starting to shift funny. I hear a whine when in low speed. It is probably there the whole time but not loud enough to hear. Not low on fluid. Fluid and filter were changed around 50k and again around 100k. Dropped pan, not flush.

[Snowcamo]

My 2015 5.3 6-Speed w/ about 115k is starting to shift funny. I hear a whine when in low speed. It is probably there the whole time but not loud enough to hear. Not low on fluid. Fluid and filter were changed around 50k and again around 100k. Dropped pan, not flush.

Mine has 137k it started around 132k miles. Crazy thing is it really only makes the sound off and on in the cold. If i hear it when i start up I pull forward and back, then shut the engine off. Most times it goes away. Its deff not consistent.
Sooner then later im going to buy a trans core and rebuild it myself just with the kit i posted. I'll moreso get a tq converter from them as well. I plan to keep mine and turn it into a full-time work truck, so it will see it's fair share of abuse at some point.

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[Black02Silverado]

Fluid changes early are not a guarantee if there is a mechanical failure.  No fluid can prevent that.  The fluid change out is great to keep things clean and fresh. 

 

Remember transmissions enemy is heat.  Every time it shifts it creates heat.  Most don't have transmission temp gauges that they monitor all the time so no way of knowing if it gets in the upper temp range at all. 

 

If you plan on keeping your vehicle then regular transmission fluid changes  such as every 50k  help to extend the life of the transmission.  Not saying to do a complete change out, just removing what comes out from the pan drop or sucking it out the dipstick tube and replacing helps.

 

Also running a quality synthetic can help since it holds up better to higher temperatures than lower quality fluids.   Standard dexron spec'ed fluids are good, but higher quality fluids such as AMSOIL and Redline are engineered to exceed that specification and have a stronger additive package so to speak as well as are a full PAO synthetic which in it's self is about the best when it comes to hot running temps.

 

My Chevy Cruze diesel's transmission runs at 225° F.  I monitor it with a ScanGauge II.  This is extremely hot compared to what our trucks run at.  I have been monitoring my 2019 and it stays at 145°F.  I have not towed with it yet to see how high it will get.  My 2002, also monitored with a ScanGauge II runs at 165°F and gets up to 198°F when I tow our 4klbs trailer.

 

I guess what I'm trying to get at is if you plan on keeping your vehicle for over 100k, transmission fluid change outs will benefit it in the long run.  What little you spend to do that every 3yrs is way better than the cost of repairing/replacing a transmission.

[Snowcamo]

Fluid changes early are not a guarantee if there is a mechanical failure.  No fluid can prevent that.  The fluid change out is great to keep things clean and fresh. 
 
Remember transmissions enemy is heat.  Every time it shifts it creates heat.  Most don't have transmission temp gauges that they monitor all the time so no way of knowing if it gets in the upper temp range at all. 
 
If you plan on keeping your vehicle then regular transmission fluid changes  such as every 50k  help to extend the life of the transmission.  Not saying to do a complete change out, just removing what comes out from the pan drop or sucking it out the dipstick tube and replacing helps.
 
Also running a quality synthetic can help since it holds up better to higher temperatures than lower quality fluids.   Standard dexron spec'ed fluids are good, but higher quality fluids such as AMSOIL and Redline are engineered to exceed that specification and have a stronger additive package so to speak as well as are a full PAO synthetic which in it's self is about the best when it comes to hot running temps.
 
My Chevy Cruze diesel's transmission runs at 225° F.  I monitor it with a ScanGauge II.  This is extremely hot compared to what our trucks run at.  I have been monitoring my 2019 and it stays at 145°F.  I have not towed with it yet to see how high it will get.  My 2002, also monitored with a ScanGauge II runs at 165°F and gets up to 198°F when I tow our 4klbs trailer.
 
I guess what I'm trying to get at is if you plan on keeping your vehicle for over 100k, transmission fluid change outs will benefit it in the long run.  What little you spend to do that every 3yrs is way better than the cost of repairing/replacing a transmission.

Agreed.

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[el_er1c]

15 minutes ago, Snowcamo said:

Mine has 137k it started around 132k miles. Crazy thing is it really only makes the sound off and on in the cold. If i hear it when i start up I pull forward and back, then shut the engine off. Most times it goes away. Its deff not consistent.
Sooner then later im going to buy a trans core and rebuild it myself just with the kit i posted. I'll moreso get a tq converter from them as well. I plan to keep mine and turn it into a full-time work truck, so it will see it's fair share of abuse at some point.

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I'm not that mechanically inclined. I do want to keep my truck as long as possible. Perhaps a rebuild or replacement when the transmission finally dies. 

[el_er1c]

12 minutes ago, Black02Silverado said:

Fluid changes early are not a guarantee if there is a mechanical failure.  No fluid can prevent that.  The fluid change out is great to keep things clean and fresh. 

 

Remember transmissions enemy is heat.  Every time it shifts it creates heat.  Most don't have transmission temp gauges that they monitor all the time so no way of knowing if it gets in the upper temp range at all. 

 

If you plan on keeping your vehicle then regular transmission fluid changes  such as every 50k  help to extend the life of the transmission.  Not saying to do a complete change out, just removing what comes out from the pan drop or sucking it out the dipstick tube and replacing helps.

 

Also running a quality synthetic can help since it holds up better to higher temperatures than lower quality fluids.   Standard dexron spec'ed fluids are good, but higher quality fluids such as AMSOIL and Redline are engineered to exceed that specification and have a stronger additive package so to speak as well as are a full PAO synthetic which in it's self is about the best when it comes to hot running temps.

 

My Chevy Cruze diesel's transmission runs at 225° F.  I monitor it with a ScanGauge II.  This is extremely hot compared to what our trucks run at.  I have been monitoring my 2019 and it stays at 145°F.  I have not towed with it yet to see how high it will get.  My 2002, also monitored with a ScanGauge II runs at 165°F and gets up to 198°F when I tow our 4klbs trailer.

 

I guess what I'm trying to get at is if you plan on keeping your vehicle for over 100k, transmission fluid change outs will benefit it in the long run.  What little you spend to do that every 3yrs is way better than the cost of repairing/replacing a transmission.

I've got the transmission temperature screen showing in the dash. Stays at 190 in short and long distance runs. I didn't start watching it until it started acting funny so not sure what it was at before. But I agree. Regular, quality fluid changes, should extend the life of the transmission. And they are definitely cheaper than replacing/rebuilding one.

[tjaudet829]

I was told Friday it would be $3400 to rebuild trans, after my dealership talked with Gm I am on the hook for $1500

Still crappy trans failed 300 miles over warranty but I guess better than nothing.

Plus dealership has had me in a courtesy car the entire time so...I'm sorta ok with it.

I just pray the rebuild lasts at least 100k

I will update when work is complete

 

[videoarizona]

Good to hear GM stepped up!!

 

I'm running a 2015 Sierra Denali with 6.2 and 8 speed. All service work by dealer done with trannie....especially the recalls for fluid. Those fixes did stop the shuddering and hard shifts long ago. Now at 81K miles and just had front 2 Magneride shocks replaced by extended warrantee company. They wouldn't replace the rears despite my telling them it was riding harder than normal., and ride height was a touch different side to side. Guess I just have to wait on those. But the fronts were locked up or very close to it. Left front was leaking. Most people that I've read about with these shocks start having ride issues at around 64K miles. So suggest everyone pay attention to your ride quality. All other Sierra maintenance is done on time.

 

I'm not going to do the next trannie flush on the 8 speed as I went over 219K on a Yukon XL SLT with 5.3 and 4 speed with only one flush (to honor warrantee). Never had an issue with that truck. Traded it as she just didn't have enough gears to pull my 6500lb trailer up our long 7% hills! Otherwise, I would still be driving that truck. Great truck, for sure!

 

My dad was a bug about buying a  new vehicle, breaking it in the way you were going to drive it, do the original maintenance items after break-in.Then leave it alone. Except for oil changes, spark plugs, brakes, etc., he never changed the rear end or trannie fluids. And always got over 250K on the cars before trade in. Guess I'm going that way as well. 

We shall see...