Guys,
Getting a bit frustrated, hoping for some help...
I got a new T87A TCM for my Sierra w/8 speed. I ordered new so I can just swap it.
It came in today, I followed the steps on the paper to replace the TCM.
When it went to copy the info from the stock TCM to the new TCM I got an error:
"TCM replacement complete. Some data was not able to be programmed. You may need to re-run the function for the new TCM if the vehicle does not run properly."
So, what next?
I tried to re-run, same result.
I then tried to read it and I did not get a screen shot - but it basically said the TCM was unreadable, here is a stock file to save.
Any advice, please? I thought this was going to be simple...
Also - I assume I can just put the factory TCM back in and be back to normal?