Overview:Fault Code 56 indicates an electrical problem in the Input 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 at least one sensor is inconsistent. Fallback:This fault causes an in-place fallback. If the Input Shaft Speed Sensor fails before power up, the transmission is unable to engage a gear and the fault code cannot be reproduced. Possible Causes:1) Transmission Harness2) Input Shaft Speed Sensor3) Various Transmission Components4) Transmission Controller Shop Talk:Select a forward gear and drive at a...

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 Harness2) Main Shaft Speed Sensor3) Various Transmission Components4) 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...

Overview:Fault Code 58 indicates an electrical problem in the Output 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 Speed Sensor readings are compared and one sensor is inconsistent. Fallback:This fault causes a 5-speed fallback and the transmission stays in either low range or high range. When the vehicle comes to a stop, an attempt to shift into low range is made. The fallback causes a 1-speed fallback on transmissions with no auxiliary section. Possible Causes:1) Transmission Harness2) Output Shaft Speed Sensor3) Various transmission components4)...

Overview:Fault Code indicates an electrical failure of the Rail Select Motor. Detection:Starting at key on and throughout operation, the Transmission Controller constantly measures the motor circuit. If a failure mode of short to battery, short to ground, or open circuit is detected, the fault code is set. The Transmission Controller also monitors the amount of current required to drive the motors. If the over current limit is exceeded, the fault code is also set. Fallback:This fault causes an in-place fallback. Possible Causes:1) Rail Select Motor2) Transmission Controller Shop Talk:Key on. If the fault is present, the system should automatically detect...

Overview:Fault Code indicates an electrical failure of the Rail Select Motor. Detection:Starting at key on and throughout operation, the Transmission Controller constantly measures the motor circuit. If a failure mode of short to battery, short to ground, or open circuit is detected, the fault code is set. The Transmission Controller also monitors the amount of current required to drive the motors. If the over current limit is exceeded, the fault code is also set. Fallback:This fault causes an in-place fallback. Possible Causes:1) Rail Select Motor2) Transmission Controller Shop Talk:Key on. If the fault is present, the system should automatically detect...