Main code 25 occurs if the output speed sensor reports a zero speed reading while both engine and turbine speeds are approximately equal, turbine speed is above a calibration value, and neutral is not selected or commanded.
Possible Causes:
1. Output speed sensor has failed
2. The required oncoming clutch or clutches did not come on.
Allison WTEC II Fault Code: 25 PID: SPN: 22 FMI: Output speed sensor, detected at 0 output rpm, 2nd
Allison WTEC II Fault Code: 25 PID: SPN: 11 FMI: Output speed sensor, detected at 0 output rpm, 1st
Allison WTEC II Fault Code: 25 PID: SPN: 00 FMI: Output speed sensor detected at 0 output rpm, Low
Allison WTEC II Fault Code: 24 PID: SPN: 23 FMI: Sump fluid temperature, hot
Allison WTEC II Fault Code: 24 PID: SPN: 12 FMI: Sump fluid temperature, cold
Allison WTEC II Fault Code: 23 PID: SPN: 15 FMI: Secondary Shift Selector Mode Function Fault
