Allison WTEC II Fault Code: 25 PID: SPN: 22 FMI: Output speed sensor, detected at 0 output rpm, 2nd

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.

Categories Allison, DTC TRUCKS, WTEC II Tags 0, 22, 25, 2nd, Allison, at, Code, Detected, Fault, FMI, II, Output, PID, rpm, Sensor, Speed, SPN, WTEC

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