PLEASE HELP - possible trans issue

[swathdiver]

If you have not changed the transmission fluid yet, do so soon. And either "flip the pill" or put in the new lower temperature transmission thermostat on the side of the transmission. It will extend its life as they typically die at 100K from the heat.

 

[Z71Burban]

If you have not changed the transmission fluid yet, do so soon. And either "flip the pill" or put in the new lower temperature transmission thermostat on the side of the transmission. It will extend its life as they typically die at 100K from the heat.

Thank you for this! Yea I think I should start there. Checked trans fluid - it seems to be over full and a little dirty but can still barely see a red tint.

 

[Z71Burban]

@Joseph Garcia @Doubeleive @swathdiver
I scanned it - here are the codes- now I’m freaking out

 

[Z71Burban]

@Joseph Garcia @Doubeleive @swathdiver
I scanned it - here are the codes- now I’m freaking out

And btw it just finally threw a check engine light on the way home from work today…

 

[Doubeleive]

@Joseph Garcia @Doubeleive @swathdiver
I scanned it - here are the codes- now I’m freaking out

well, I would go to a LEGIT transmission shop that has worked on these transmissions and see what they think, I am no expert but in some cases the techm can be replaced if that's all it is and there is no metal found in the pan. cases like that are rare but possible. you might be looking at a rebuild though.

 

[swathdiver]

@Joseph Garcia @Doubeleive @swathdiver
I scanned it - here are the codes- now I’m freaking out

Oh boy, I'm looking at the shop manual for my 6L80... well, here's what it says:



9 out of 10 transmission shops are going to want to either rebuild the entire transmission or replace it with a remanufactured one. A new GM reman and converter will run about $5-6K installed, maybe less depending on the market and dealer and comes with a 3 year 100K mile warranty and can be serviced nationwide.

If you want to know exactly what's wrong with it, get a bi-directional scan tool on it, like a Snap-On Solus or GMs MDI with GDS software on a laptop. Otherwise, you'll get the standard, "your transmission is bad, it's need to be replaced" answer.

As you can see, you might get away with a new valve body/TECHM and torque converter.

 

[Doubeleive]

Oh boy, I'm looking at the shop manual for my 6L80... well, here's what it says:

View attachment 392240View attachment 392241View attachment 392242View attachment 392243View attachment 392244

9 out of 10 transmission shops are going to want to either rebuild the entire transmission or replace it with a remanufactured one. A new GM reman and converter will run about $5-6K installed, maybe less depending on the market and dealer and comes with a 3 year 100K mile warranty and can be serviced nationwide.

If you want to know exactly what's wrong with it, get a bi-directional scan tool on it, like a Snap-On Solus or GMs MDI with GDS software on a laptop. Otherwise, you'll get the standard, "your transmission is bad, it's need to be replaced" answer.

As you can see, you might get away with a new valve body/TECHM and torque converter.

broken hub weld is a known problem, when mine was rebuilt they added extra welds to the new one to prevent that issue, basically the inside was welded all the way around where it breaks

 

[kentman]

A new GM reman and converter will run about $5-6K installed,

Been there, done that. I was $5.7K installed after $300 GM rebate back in August 2022 at 121K miles.

 

[Z71Burban]

Unreal - I should’ve kept my 03 z71…over 200k zero problems with motor or trans…was just literally rusting out.

It’s sitting now - only driving it when I absolutely have to incase it’s saveable. But had to go out yesterday and no check engine light (no I didn’t clear codes) and it’s shifting perfectly normal like nothing ever happened. So strange.

I have an appointment set on Tuesday to diagnose. I will update on here as we go! Thank you guys for all your help and support! I greatly appreciate all the advice!