no you may need a transmission adjustment or maybe a new filter
You need a new transmission it will not drive properly
If it has a 4L60E then you need a new transmission control solenoid inside the transmission. If you have the 4L80E then you need to find and change the transmission control module
It sounds like you ECT ECU - which is your Electronic Constrol Transmission. You do not need a new transmission ECT is the control unit for the transmission and will need to be reflashed or replaced. Afterwhich your transmission will work like new.
your transmission could be shot. if it will not shift at all, then you will need a new one.
You either need a new transmission or a new clutch.
The signs that you might need a new transmission include rough shifts, slippage, leaks, delayed engagement, dashboard warning lights, and many others.
you might need a new one soon. but first check your transmission fluid.
11-11.5
You may need a new transmission, or you at least need to have that one rebuilt.
You either need a new transmission or a transmission fluid flush and refill.
The gears will quickly grind down to junk, and you will need a new transmission.