This could be due to either a mechanical or electrical failure inside the transmission. Sometimes it's an easy repair and other times we have to remove the transmission and it may need to be rebuilt. The only way to know is to scan the transmission module for faults and then pinpoint test the wiring. This could also be due to low fluid in the transmission which we always check first and is an easy fix.
Give us a call and let us take care of you.
Happy Adventures,
Heather