Eaton Gen 2 (AutoShift) Fault Code: 72 PID: SID 59 FMI: 7 Failed to Select Rail

Overview:
Fault Code 72 indicates the transmission is unable to select the required rail during a shift.

Detection:
The transmission detects this by attempting the same shifter actions 5 times and not sensing the desired position.

Fallback:
This fault causes an in-place fallback.

Possible Causes:
1) Low power to Rail Motor
2) Rail Select Motor
3) Rail Select Sensor
4) Shift Block
5) Transmission Controller
6) Rail slips into gear during vehicle transportation

Shop Talk:
Complete several shifts while the vehicle is in motion, including selections from neutral. Also allow the transmission to complete several automatic
shifts.