Check under the lift the wire sometimes cuts
And give wrong diagnostic have to replace speed sensor and still same controller.. same problem until trace the wire is ligh blue and is broken reconnect and all is working perfect..

Thank you! I appreciate your help.

hello, just seen you responded sorry for the late re post, on the drive motor you will see a small two wire plug, ohm the wiring from that plug to the drive controller , located on the back left side panel if you are sitting on the truck, if wires are okay, you can swap the controllers from the top to bottom, if code the same you have a speed bearing issue

Thank you for your response...is there a way one can test to see which is failing? Like the bearing or if the signal is lost? How would one identify which issue is causing the problem?

Output when the traveling AC driver 1 detects the abnormality of the drive motor 1 rpm sensor. basically you have a drive motor sensor bearing failing on you or your losing the signal to the drive amplifier. common issue we see with these trucks.