Limp on these transmissions is full line pressure, 2nd gear ( reverse will work also ). This will be the case even if all electrical is lost to the transmission.

You need to look up what the code is and not randomly replace parts.

When the driver states , " put the shifter into drive or reverse nothing would happen "

Nothing as in:

Car won't move / engine won't rev

Car won't move / engine revs freely

Car won't move / engine strains when gas is pressed ( like brake is on )