2007 Envoy Denali trans problem

[otter7]

I have a 2007 Denali with 64000 mi. Drive and 3rd went out suddenly.
reverse,2 and 1st engage. Truck does not tow and is serviced every 3-4000 mi.
Trans fluid changed at 50000. Any ideas or other owners have this problem?
Truck went off extended warranty one year ago.
Thanks for your help.

 

[GMC Customer Service]

I have a 2007 Denali with 64000 mi. Drive and 3rd went out suddenly.
reverse,2 and 1st engage. Truck does not tow and is serviced every 3-4000 mi.
Trans fluid changed at 50000. Any ideas or other owners have this problem?
Truck went off extended warranty one year ago.
Thanks for your help.

otter7,
I would like to apologize for the issues that you are experiencing with your vehicle. If you are not able to get this issue diagnosed I would recommend that you contact your dealer. They may be in the best position to assist you in getting this diagnosed for you. I would like you to keep me posted on this and if you have any other questions please feel free to contact me anytime.
Thank you,
Stacy GMC Customer Service

 

[GMC33]

We have GMC Customer Service here?? Nice!

 

[Molson02536]

I have a 2007 Denali with 64000 mi. Drive and 3rd went out suddenly.
reverse,2 and 1st engage. Truck does not tow and is serviced every 3-4000 mi.
Trans fluid changed at 50000. Any ideas or other owners have this problem?
Truck went off extended warranty one year ago.
Thanks for your help.

You may have the 2nd and 3rd gear with revers, if you do then it sounds like an easy fix.

No 1st or 4th available and transmission shifts 2nd to 3rd by itself in D or OD and locks the converter. The ShiftA solenoid failed which is a easy fix in the pan, Or it could be a wiring problem from PCM to transmission.

Keep us posted and good luck

Molson02536

 

[otter7]

trans problem

GMC techs diagnosed a forward sprague gear failure a complete overhaul is required.

Thanks for your help
otter7

 

[GMC Customer Service]

GMC techs diagnosed a forward sprague gear failure a complete overhaul is required.

Thanks for your help
otter7

otter7,
Thank you for the update on this. I am happy to hear that your dealer was able to get this issue diagnosed for you. If you have any other questions please feel free to contact me anytime.
Thank you,
Stacy GMC Customer Service