today on the way home my 04 CTT acted up again. PRND all light up and no gears selected but the car shifted and down OK. I used Durametric to pull a code and it indicated
"721
Input shaft speed inductive pickup-implausible signal, test conditions are not completed, fault is not currently active and causing a DTC light"

Any ideas of what is going on? I searched this forum, reenlist forums, and rentech forum but no information regarding 721 code. I saw a threat mentioned PRND light up with 1314 code only.

Any help will be greatly appreciated.

ALX5