Transmission changing from auto to manual on its own.

[Bamafan]

I just bought a 2018 Tahoe it is the 6.2 and 90000 on it. 3rd day it gave a stability error and engine code. Took back to dealer they said it was a transmission code that set it off code cleared no issues. Today going down the road the cruise cuts itself off and im seeing the trans go from L7 back to auto. When I get to my destination the door locks start cycling. Any ideas what’s going on. Thanks for help in advance.

 

[B-train]

Oh boy, electrical gremlins for sure. I'm hoping you have some sort of warranty with purchase? Might want to start with power and ground connections, especially if you live in a salt state. Or, you may have some sort of computer getting flakey, which would require dealer assistance.

 

[Bamafan]

Yeah I have a warranty can return it for a few more days. Ball is in their court on how I react.

 

[Bamafan]

if a computer is being flakey can they detect it ?

 

[Bamafan]

Got a message today from dealership my Tahoe. “it has interface module issues... I’m not sure what that means I’m guessing a flakey computer?

 

[Bamafan]

Dealer put a human interface module on and it did not fix it going back to dealer

 

[Bamafan]

Does the 2018 been known for transmission issues?

 

[BG1988]

Does the 2018 been known for transmission issues?

any car brand from 1900 to 2023 has known issues

 

[Bamafan]

Ok thanks for that. So let me say it in a different way. Some models and especially some certain years will have more trouble with one issue than others. Like the 2018 we’re known to have some transmission issues is kinda what I was asking.