HELP john deere 3720 operates wont drive error code 12

[Confused2015]

I have 2730 auto st john deere when operating it it will stop and will not move everything else will work fine gives a error code 12 I have replaced sensor on throttle pedal and found orange wire 673 had nick in wire which was rubbing throttle pedal fixed the wire. pulled connectors apart make sure theywasn't dirty still getting a error code 12. wondering do I need to calibrate something or look at replacing a another sensor any advise would be greatly appreciated