Question

The transmission beginning in second gear, and I got the codes P0773 and p0721 on my 2006 Kia Sorento 3.5L

Answer 1

Hi there,

The code P0773 indicates an issue with the low-coast brake solenoid. Here is a list of probable causes. 

P0773 KIA - Low Coast Brake Solenoid
Read more: https://www.autocodes.com/p0773_kia.html

The code P0721 indicates an issue with the speed sensor. Here is some info for you.

P0721 KIA - Vehicle Speed Sensor 1
Read more: https://www.autocodes.com/p0721_kia.html