I have a 2016 K2500 with 44000 miles. I have pulled a camper and other trailers with it for less than 500 of those miles. This vehicle has been well cared for. About a month ago I got a check engine light with codes P0700 and P0741. When I took to my local repair shop, who I trust, they told me the fluid was burnt and there was metal in the pan and that the transmission was toast. I've been told there are issues with this transmission that are known by GM but nothing is being done. Pretty sad state of affairs to lose a transmission at so few miles. Called the dealership where I bought the truck new and they said there was nothing they can do. $6500.00 for a remanufactured transmission at 44K miles. What a disappointment. A local transmission repair shop works on 2 of these transmissions a week. Has anyone heard of GM doing anything about these issues?

 

The 8-speeds are notorious lemons
https://www.roadandtrack.com/news/a4...earbox-issues/

The expected average length of ownership of new vehicles is around 6-8 years (or just out of warranty).
Manufacturers are now making cars with this target in mind. Yes it is a sad state of affairs.

Mine went out at 43k. Next vehicle probably won't be GM.

 

Mine has a 6 speed mated to the 6.0 liter engine.

 

oh right you have the 2500. Well that sure is disappointing.
"New GM" has slipped far since the bailouts

 

I realize this is a delayed response but wanted to provide what knowledge I have to share about this.

FYI this is info gained from a trans shop I work with on a regular basis, I just haven’t had the opportunity to talk with them and get more in-depth details.

As I understand it, the primary issue with the later model 6 speeds (6L80 & 6L90 for sure, possibly others) is the torque converters are failing internally and sending excess metal into the pan, which then restricts and/or completely clogs the filters, preventing adequate fluid flow and pressure. This can cause a complete or partial loss of functionality depending upon the level of contamination.

Sometimes the truck can be shut off and allowed to cool down, then restarted and the trans will work normally for a short while - and sometimes the filter is too clogged to allow it to work at all.

Trucks/vans being used for hauling and commercial work seem to be the most susceptible to this failure. In the past 4 months, I’ve pulled the trans out of (2) Express 3500 vans and sent (2) 2500HD pickups to the trans shop for repair. They not only replace the TC, but do a complete tear down to clean everything and inspect/replace any components that need it.

GM is flashing the PCM/TCM’s as part of the correction to the transmission operation, so I don’t know if the TC clutch solenoid needed a different engage/disengage protocol or what. As of yet I haven’t seen any TSB’s directly related to this issue, but at the rate they’re failing, I don’t see what choice GM will have but to start reimbursing customers for it.