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Eaton Gen 2 (AutoShift) Fault Code: 57 PID: 160 FMI: 2 Main Shaft Speed Sensor

Overview:
Fault Code 57 indicates an electrical problem in the Main Shaft Speed Sensor circuit. The signal from the sensor did not match the current operating conditions.

Detection:
A Speed Sensor is determined faulty when all the Speed Sensor readings are compared and one sensor is inconsistent.

Fallback:
There fault causes an in-place fallback mode.

Possible Causes:
1) Transmission Harness
2) Main Shaft Speed Sensor
3) Various Transmission Components
4) Transmission Controller

Shop Talk:
Select a forward gear and drive at a steady speed no slower than 10 MPH. It may be necessary to operate the vehicle for a prolonged period of time if the cause of the failure is related to heat and vibration.

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