Code P056, Transaxle Input Speed Sensor Circuit Problem: Notes
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
This test checks transaxle input speed sensor circuit problem. If engine is running and vehicle is moving at greater than 10 MPH, then transaxle input speed must be non-zero. If turbine speed is less than 50 MPH with vehicle speed of 10 MPH or greater, Code P056 will set.