what is the most likely cause for a p0720 code a put and output speed sensor on the car is a 2001 Suzuki SUV with a 4l30e the transmissions 1-2 shift is a late one shifts to second very late all other shifts seem good
That is an output speed sensor problem. You need to have your output speed sensor replaced. This will cause the transmission to shift erratically due to it not knowing the correct speed of the vehicle. This is a pretty common problem with several vehicles.