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: 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
Allison WTEC II Fault Code: 23 PID: SPN: 14 FMI: Secondary Shift Selector or RSI Link Fault
Allison WTEC II Fault Code: 23 PID: SPN: 13 FMI: Primary Shift Selector Mode Function Fault
Allison WTEC II Fault Code: 23 PID: SPN: 12 FMI: Primary Shift Selector or RSI Link Fault
