Allison WTEC II Fault Code: 25 PID: SPN: 00 FMI: Output speed sensor detected at 0 output rpm, Low

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

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