2007 Yukon Denali XL Transmission Failure

[swathdiver]

After removing the fuse box all the codes were wiped and the check engine light was off. I restarted the car a made this video of the noise coming from the transmission which hopefully you can hear that is making a strange noise.

https://youtu.be/n_mzEiy9qhI

No gears are engaging.

No engine check light came back on but I did get the code - trans solenoid A stuck so I am pretty convinced that there is something busted in the trans case somewhere.

So I think it's time to get an expert to look at it. Can anyone suggest a decent transmission shop in the San Jose CA area please?

Andrew, same suggestions as posts #5 and #6. Jamison offered to help diagnose/clean/test with his Tech-2. You could replace the entire TECHM from the underside without removing the transmission but it would still require the services of a Tech-2 for programming the computer to your VIN. If you go this route, do not use Dorman, use only GM OE. The Dormans have a terrible failure rate, like 5 of 6!

 

[2007 Denali XL]

Andrew, same suggestions as posts #5 and #6. Jamison offered to help diagnose/clean/test with his Tech-2. You could replace the entire TECHM from the underside without removing the transmission but it would still require the services of a Tech-2 for programming the computer to your VIN. If you go this route, do not use Dorman, use only GM OE. The Dormans have a terrible failure rate, like 5 of 6!

thanks Swathdiver but I dont have the skill or experience for that level of work

 

[swathdiver]

thanks Swathdiver but I dont have the skill or experience for that level of work

Oh, come now Andrew! Can you field strip and clean a pistol? Check out the video in this link. Look, even if you cannot do it, at least you know what probably needs to be done so someone doesn't lighten your wallet by several grand.

https://www.sonnax.com/parts/3754-pressure-switch-rebuild-master-pack

 

[2007 Denali XL]

Oh, come now Andrew! Can you field strip and clean a pistol? Check out the video in this link. Look, even if you cannot do it, at least you know what probably needs to be done so someone doesn't lighten your wallet by several grand.

https://www.sonnax.com/parts/3754-pressure-switch-rebuild-master-pack

er, as far as the pistol goes that would be a no?

thanks for the link,

It would seem like you are quite sure its the pressure switch that needs replacing?

 

[Joseph Garcia]

er, as far as the pistol goes that would be a no?

thanks for the link,

It would seem like you are quite sure its the pressure switch that needs replacing?

If Swathdiver suggests something, I recommend that you consider it to be a high percentage suggestion. He's helped a lot of folks on this Forum.

 

[swathdiver]

er, as far as the pistol goes that would be a no?

thanks for the link,

It would seem like you are quite sure its the pressure switch that needs replacing?

So how do you keep your pistol clean?

Pretty sure as that is what the code suggests. But since I am making a diagnosis from my chair hundreds of miles away, I suggested the tests to make sure. In addition, being disabled, perusing these forums is about all I can do anymore and having spent the time perusing the pages of these forums, the solenoids needing rebuilding is always the cure when guys don't just replace the whole transmission.

 

[2007 Denali XL]

So how do you keep your pistol clean?

Pretty sure as that is what the code suggests. But since I am making a diagnosis from my chair hundreds of miles away, I suggested the tests to make sure. In addition, being disabled, perusing these forums is about all I can do anymore and having spent the time perusing the pages of these forums, the solenoids needing rebuilding is always the cure when guys don't just replace the whole transmission.

Thanks and I am very grateful for your advice and glad guys like you are helping us all out.

Next thing is to find a good local tech

 

[2007 Denali XL]

Thanks and I am very grateful for your advice and glad guys like you are helping us all out.

Next thing is to find a good local tech

Upon closer inspection to the wiring loom I noticed some rodent damage.

Nothing seems to be chewed through but could they still be shorting?

Is it possible this level of wire damage could effect the transmission?

 

[donjetman]

Yes ? ? is my guess.
For sure that's not good

 

[2007 Denali XL]

Upon closer inspection to the wiring loom I noticed some rodent damage.

Nothing seems to be chewed through but could they still be shorting?

Is it possible this level of wire damage could effect the transmission?

View attachment 239018 View attachment 239019 View attachment 239020

OK, repaired the wiring in the engine bay but sadly that has not fixed the transmission issues.