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 failed2. The required oncoming clutch or clutches did not come on. Allison WTEC II Fault Code: 25 PID: SPN: 33 FMI: Output speed sensor, detected at 0 output rpm, 3rd 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:...

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 failed2. The required oncoming clutch or clutches did not come on. Allison WTEC II Fault Code: 25 PID: SPN: 44 FMI: Output speed sensor, detected at 0 output rpm, 4th Allison WTEC II Fault Code: 25 PID: SPN: 33 FMI: Output speed sensor, detected at 0 output rpm, 3rd Allison WTEC II Fault Code: 25 PID: SPN:...

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 failed2. The required oncoming clutch or clutches did not come on. Allison WTEC II Fault Code: 25 PID: SPN: 55 FMI: Output speed sensor, detected at 0 output rpm, 5th Allison WTEC II Fault Code: 25 PID: SPN: 44 FMI: Output speed sensor, detected at 0 output rpm, 4th Allison WTEC II Fault Code: 25 PID: SPN:...

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 failed2. The required oncoming cluth or cluthes did not come on. Allison WTEC II Fault Code: 25 PID: SPN: 66 FMI: Output speed sensor, detected at 0 output rpm, 6th Allison WTEC II Fault Code: 25 PID: SPN: 55 FMI: Output speed sensor, detected at 0 output rpm, 5th Allison WTEC II Fault Code: 25 PID: SPN:...

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be closed. Allison WTEC II Fault Code: 25 PID: SPN: 77 FMI: Output speed sensor, detected at 0 output rpm, Reverse range Allison WTEC II Fault Code: 25 PID: SPN: 66 FMI: Output speed sensor, detected at 0 output rpm, 6th Allison WTEC II Fault Code: 25 PID: SPN: 55 FMI: Output speed sensor, detected at 0 output rpm, 5th Allison WTEC II Fault Code: 25 PID: SPN: 44 FMI: Output speed sensor, detected at 0 output rpm, 4th Allison...