: A neglected air dryer can allow moisture or oil into the transmission’s pneumatic system. This often damages the clutch actuator and internal brake , leading to clutch burn or the inability to disengage the clutch.
: Software issues or faulty TCM modules can cause "ghost" neutral shifts or lock the transmission into manual mode. Often, a software update or a clutch/transmission relearn procedure is required to recalibrate the system. Symptoms & Warning Signs 2016-freightliner-cascadia-automatic-transmission-problems
: External air leaks along the frame or at the shift actuator can cause the truck to drop into neutral unexpectedly during gear changes (e.g., shifting from 4th to 5th). : A neglected air dryer can allow moisture