C8-3 = Drive motor R/H speed sensor OPEN.
Jack the front & block the truck securely, remove the black inspection cover under the front that protects the traction motor speed sensors & check the speed sensors.
There are 2 x speed sensors on each of the traction motor, there all the same part number.
While the inspection cover is removed its worth removing all the sensors one by one & giving them a quick clean to remove dirt / debris from the sensor.
The inspection cover & sensors are also prone to impact damage when the truck is run over solid debris.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.