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.
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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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